Any one know the oal capacity of the 300 PRC magazine? I'm looking at a custom barrel chambering and want to know if it will fit.
Took a quick side profile shot of my MK22 with the following A419 items:
I also have an Atlas CAL bipod that I switch in and out for the Harris, which also has the A419 Arcalock clamp. My only complaint with the MK22 compared to the AXSR, is that there was not proprietary Arca built-in to the rail.
- A419 MK22 Arcalock Rail
- A419 Harris Arcalock Clamp Kit
View attachment 8319218
Agreed! They did a great job with it!I like how the MK22 arca comes flush with the portion where the barrel clamps. I'll have mine Thursdays.
Thanks,The SAAMI spec for .300 PRC OAL is 3.575-3.700" the B magazine for 300wm has internals of 3.8. Obv you will want it a little short to ensure feeding.View attachment 8319620
The fix it sticks are great but I wasn't able to find the 140 in-lb without buying the kit from Barrett.As others have responded, my guess is that you didn't lock the bolt once you dropped the barrel in. Done that a time or two and I got that wobble you speak of. That notch is what I always look for and place the whole rig vertically, drop the barrel in and feel for the notch slipping into place. You'll also notice that the caliber size is on the top surface of the barrel near the muzzle brake. A great check for barrel seating and timing on a muzzle brake,btw.
I always alternately tighten the screws until I reach the 140 in lbs of torque. Very important to have a torque wrench like the fix it sticks. Barrett sells those, but I'm sure you can get those cheaper elsewhere.
Have fun.......................
They sell it individually, LMT people need it too.The fix it sticks are great but I wasn't able to find the 140 in-lb without buying the kit from Barrett.
I like the kit as it is well thought out, but man, the price on that thing.The fix it sticks are great but I wasn't able to find the 140 in-lb without buying the kit from Barrett.
this is straight facts.I like the kit as it is well thought out, but man, the price on that thing.
Not that I'm aware of. I wish i could get an unfinished .308 or .300 mag to file feed lips myself to run a 6.5saum.Anyone know of mag extension kits? I’m not really a fan of how my 300NM feels on that first round when I have a full mag.
Hello,
does anyone know what a safe headspace measurement could be for the .338LM version? Can't find any SAAMI specs for this cartridge.
Bought some 1F LAPUA 338LM brass online and getting ready to handload. It's measuring at 2.327-2.328" (Hornady headspace gauge) and will not allow the bolt to close even when pushing forward on the bolt. I have been incrementally bumping the shoulder and can now chamber brass measuring 2.322" headspace. This still requires a light forward push of the bolt before it will turn down. I have tried bumping the shoulder as much as I can down to 2.315" and still the bolt won't close freely without forward push - like it does when no brass is being inserted into the chamber.
I hope I've explained this coherently enough that someone can offer me guidance.
Thanks.
That’s because of the ejector spring being so strong. You are applying the forward force to compress the spring as it seats into the bolt face.This still requires a light forward push of the bolt before it will turn down.
Hello,
does anyone know what a safe headspace measurement could be for the .338LM version? Can't find any SAAMI specs for this cartridge.
Bought some 1F LAPUA 338LM brass online and getting ready to handload. It's measuring at 2.327-2.328" (Hornady headspace gauge) and will not allow the bolt to close even when pushing forward on the bolt. I have been incrementally bumping the shoulder and can now chamber brass measuring 2.322" headspace. This still requires a light forward push of the bolt before it will turn down. I have tried bumping the shoulder as much as I can down to 2.315" and still the bolt won't close freely without forward push - like it does when no brass is being inserted into the chamber.
I hope I've explained this coherently enough that someone can offer me guidance.
Thanks.
This is the way.That’s because of the ejector spring being so strong. You are applying the forward force to compress the spring as it seats into the bolt face.
I have to do the same with my new MRAD and also with my AXSR.
Take the ejector spring out and you’ll see that forward push disappear.
Yep. Red loctite up and down those threads. Small Propane torch worked best for me and thrown into a barrel vise.Finally got a .308 barrel and I'm looking to take the factory brake off of it -- I'm assuming they've threadlocked it to hell and back, so the best solution is probably to clamp it in a vise, heat the brake, and go to town, right? Seems to not be the newer style brake without the additional nut behind it.
I was working on a prototype, but the problem is that the current mags are at the near maximum in terms of spring travel. When you remove the factory floor plate, there is only room for maybe 1 extra round for an extension before the spring would be fully extended - this would lead to unreliable feeding on the last round or two with any extension and lack of modification to factory springs.Anyone know of mag extension kits? I’m not really a fan of how my 300NM feels on that first round when I have a full mag.
Ordered (barrel makers kit) on 29DEC2023 and received on 25JAN2024. Basically a month.I'll have to look into that and call barrett direct.
Would be interested in what happens with your purchase. Please let me/us know how long it takes......Thanks
I ordered a .308 "C" as well in November and took about a month as well.Ordered (barrel makers kit) on 29DEC2023 and received on 25JAN2024. Basically a month.
Thanks JB. Got mine ordered.Ordered (barrel makers kit) on 29DEC2023 and received on 25JAN2024. Basically a month.
I have a 7 PRC barrel from Marc at Spartan Precision. It is a laser beam. Uses B mags/barrel maker kit. Haven’t tried any other custom barrels besides Proof and Spartan.My Barrett MRAD Bugholes (Souther Precision Rifles) barrel should be done in a month or two.
I can't lie, I literally think about it every day I'm so excited to get it.
I went with a Bartlein 400ModBB 300 Norma Mag 32 inch barrel Heavy Varmit with a 1" muzzle diamter FDE cerakote with the standard MRAD flutes.
Plan to shoot 245 grain LRHT bullets over N565 in Lapua brass.
Plus I'm praying my FDE Thunderbeast Ultra 338 clears ATF jail soon which should make for a better shooting experience.
Anyone done something similar? Let me know your experience with bugholes barrels or any custom barrels. Interested to hear from the 300 Norma guys on here too about loads and successes with the MRAD.
I have done a bartlein modbb 300 norma at 28inches with a heavy modified palma. Was running 82grn of re26 with a 220 berger at 2970fps or 3040. Cant remember. I'm working up some loads for 245's. The barrel is a left hand gain twist starts at 1/9, exits at 1/8. Shoots great so far only 160 rounds into it. This was chambered by lri. Swatdude1 has used bugholes and has been happy with his stuff. I've had mrad barrels done by a number of smiths and they're all shooters. GAP, Spartan, LRI, PVA.My Barrett MRAD Bugholes (Souther Precision Rifles) barrel should be done in a month or two.
I can't lie, I literally think about it every day I'm so excited to get it.
I went with a Bartlein 400ModBB 300 Norma Mag 32 inch barrel Heavy Varmit with a 1" muzzle diamter FDE cerakote with the standard MRAD flutes.
Plan to shoot 245 grain LRHT bullets over N565 in Lapua brass.
Plus I'm praying my FDE Thunderbeast Ultra 338 clears ATF jail soon which should make for a better shooting experience.
Anyone done something similar? Let me know your experience with bugholes barrels or any custom barrels. Interested to hear from the 300 Norma guys on here too about loads and successes with the MRAD
What made you go with the gain twist? Got any pictures of groups?I have done a bartlein modbb 300 norma at 28inches with a heavy modified palma. Was running 82grn of re26 with a 220 berger at 2970fps or 3040. Cant remember. I'm working up some loads for 245's. The barrel is a left hand gain twist starts at 1/9, exits at 1/8. Shoots great so far only 160 rounds into it. This was chambered by lri. Swatdude1 has used bugholes and has been happy with his stuff. I've had mrad barrels done by a number of smiths and they're all shooters. GAP, Spartan, LRI, PVA.
Nice man. What sort of velocities you getting?I have a 7 PRC barrel from Marc at Spartan Precision. It is a laser beam. Uses B mags/barrel maker kit. Haven’t tried any other custom barrels besides Proof and Spartan.
I’m averaging around 2860-2880. I also don’t reload unfortunately so that’s with factory hornady 180 grain. A ten shot grouped .58 inch.Nice man. What sort of velocities you getting?
I checked the exploded view and it says it’s a .093 X 500 roll pin.Hey fellas,
those of you with experience behind the MK22 suppressor (AML 338) - how is it? POI shift, repeatability, sound?
Thinking of picking up a MK22 from a friend and if I did, I'd want the suppressor as well.
Not the AML338, but I do have lots of time behind the AM30. I’m sure there are more modern, higher volume suppressors that beat it for sound in the 8” length class, but it works great. The muzzle brake suppressor mount is high quality and locks up tight with the taper interface. POI repeatability with removal and reattaching during for cleaning is very good, I have never had a POI shift from removal. The one I shoot is about 8 years old and ~8K rounds fired, and it is still going strong. It’s a good system.Hey fellas,
those of you with experience behind the MK22 suppressor (AML 338) - how is it? POI shift, repeatability, sound?
Thinking of picking up a MK22 from a friend and if I did, I'd want the suppressor as well.
Dang. Responded to the wrong post and figured out I couldn't delete. I checked the exploded view and it says it’s a .093 X 500 roll pin.Anybody know the specs for the MRAD ejector roll pin? $5.00 for a simple roll pin seems rather ridiculous so I'm looking to get some at M Carr or Grainger.
Thanks for the information. Looks like it is an odd ball to find.I checked the exploded view and it says it’s a .093 X 500 roll pin.
Now, just to figure out how to spend $100 to qualify free shipping...Anybody know the specs for the MRAD ejector roll pin? $5.00 for a simple roll pin seems rather ridiculous so I'm looking to get some at M Carr or Grainger.
Its an $1,800 accessory that you could be replaced for half the price, for a $15,000 rifle that you can actually buy for half the price. Granting that they're both cool as fuck, probably collectible, and you're already down for fiscal irresponsibility, it'd be foolish to get one and not the other.Hey fellas,
those of you with experience behind the MK22 suppressor (AML 338) - how is it? POI shift, repeatability, sound?
Thinking of picking up a MK22 from a friend and if I did, I'd want the suppressor as well.
Of note, and maybe this is obvious: if you get the AML338 suppressor for 338 barrels but also have 30 cal barrels, the muzzle devices are different spec to prevent attaching the AM30 to a 338 barrel. Just gotta make sure any 30 cal barrels are also equipped with the 338 muzzle device as well for that scenario.
I have a 33XC Bartlein modBB barrel from Bugholes that shoots one ragged hole. Chase Stroud did the load development for me and was very impressed by SPR's work. I got two consecutive hits at 2 miles with this barrel with Chase spotting. He said no "student" had ever done that and I credit SPR for impressive smithing. I also have a non-modBB Bartlein barrel in 300PRC which has the Barrett flutes (SPR as well). I shot a 1/4 MOA group at 200 yards with Hornaday factory ammo but was never able to duplicate. But that barrel is definitely half MOA for sure. I wish I'd done flutes on the 33XC just to maintain the factory look. Now I'm waiting on a .416 modBB blank SPR ordered for me so Greg can spin me up a 41XC barrel and will definitely do Barrett flutes and Cerakote on that one.My Barrett MRAD Bugholes (Souther Precision Rifles) barrel should be done in a month or two.
I can't lie, I literally think about it every day I'm so excited to get it.
I went with a Bartlein 400ModBB 300 Norma Mag 32 inch barrel Heavy Varmit with a 1" muzzle diamter FDE cerakote with the standard MRAD flutes.
Plan to shoot 245 grain LRHT bullets over N565 in Lapua brass.
Plus I'm praying my FDE Thunderbeast Ultra 338 clears ATF jail soon which should make for a better shooting experience.
Anyone done something similar? Let me know your experience with bugholes barrels or any custom barrels. Interested to hear from the 300 Norma guys on here too about loads and successes with the MRAD.
@mike10 sorry just seeing this. Went with gain twist to test it, based on Snipers Hide lore. Its accurate and load development has been super easy. Usually shooting steel at 500 and further. But I'll post some pics. Funny thing was I had two identical barrels spun up and tested both with my mrad. My brother used the other barrel at the NF match. We tried shooting same ammo, scope, rifle. I'm happy with all my factory and custom mrad barrels. If its a palma contour it's slightly modified with 1.25in diameter for the first 5 inchs to accomadate the mrad extension.What made you go with the gain twist? Got any pictures of groups?
I want a 308 shorty as well. My problem is I have too many damn rifles and barrels to keep justifying more barrelsGot My 308 Shorty. Probably going to rattle can it. Overall I'm very impressed! 300 PRC barrel is on order, apparently its going to take 12-18 months
View attachment 8338248
Always loved the short 17” rifles. I have the most fun shooting my 17” with my can. Dang, 10-12 months? Where did you order from, Barrett or elsewhere?Got My 308 Shorty. Probably going to rattle can it. Overall I'm very impressed! 300 PRC barrel is on order, apparently its going to take 12-18 months
View attachment 8338248
Just weight in at 16.5 lbs as configured, it’s basically a bull barrel under there so she’s got some heftI want a 308 shorty as well. My problem is I have too many damn rifles and barrels to keep justifying more barrels
How much does your rifle weigh as configured in the picture?
Always loved the short 17” rifles. I have the most fun shooting my 17” with my can. Dang, 10-12 months? Where did you order from, Barrett or elsewhere?
Great setup! The Tremor3 is the sh#%! I just got the Vortex on sale at Europtic. My MRAD was pre-Mlok but I was still able to mount the Area 419 ARCA rail on it. Thinking of moving it forward as far as I can to get the bipod closer towards the muzzle for extra stability.I've been reading on the forum for quite a while now and have gained so much information from everyone on here. It really is one of the best resources out there for anything long range related. I finally figured I would reply with my MRAD and how it's set up. It's been a great gun so far and I've been able to shoot several hundred rounds out of each of my barrels.
Here is my current setup... Eager to hear some feedback on any changes y'all would make.
Currently have my Proof Research 7PRC barrel installed with an Unknown Munitions Ti Pro 5 brake. (I also have the Barrett .338 & 6.5 creedmoor barrels)
Recently picked up an Area 419 ARKALOCK rail to mount a bipod, Garmin Xero C1, and a Tri-Pod
Atlas CAL Bipod
MDT Grip
Spuhr Mount
Nightforce ATACR 7x35 F1 with Tremor 3 reticle
Vortex Impact 4000
View attachment 8339952View attachment 8339953
Yeah, this is my first optic with the Tremor3 reticle and I'm loving it. The ARCA rail is great! I'm looking forward to being able to use it with the Area 419 Garmin Xero mount. I'm curious if moving the ARCA rail out further would provide a benefit. I can see how it would provide a bit more stability but am curious if it would flex at all negating any stability benefit you would get from pushing it out further.Great setup! The Tremor3 is the sh#%! I just got the Vortex on sale at Europtic. My MRAD was pre-Mlok but I was still able to mount the Area 419 ARCA rail on it. Thinking of moving it forward as far as I can to get the bipod closer towards the muzzle for extra stability.
I think Frank covered this a few years ago. Cantilevering the Arca rail out in front of the stock or handguard introduces measurable inconsistency.curious if it would flex at all negating any stability benefit you would get from pushing it out further.
Thanks for clarifying. I figured that may be the case.I think Frank covered this a few years ago. Cantilevering the Arca rail out in front of the stock or handguard introduces measurable inconsistency.
Just weight in at 16.5 lbs as configured, it’s basically a bull barrel under there so she’s got some heft