• Watch Out for Scammers!

    We've now added a color code for all accounts. Orange accounts are new members, Blue are full members, and Green are Supporters. If you get a message about a sale from an orange account, make sure you pay attention before sending any money!

300 PRC update

Midsouth had 8# jugs of R26 in stock for a whole 45 seconds. Got an order in. We’ll see if it ships. It was out of stock before I could post it up here. Hopefully it’s a sign it will pop up at some other retailers soon.
It's been my experience with Midsouth that if your order is in, you will receive the item.
 
Update from testing the 168 match bullets in the 300PRC. I added an entire grain of RL-26...and the speeds were much better on ES/SD...but just a tad faster....average was 3520fps. ES was 27 across 15 shots. This was on non-virgin Lapua.....groups were barely under and inch though....3 5shot groups...and they weren't very pretty.
Smokin,,,,,,, dam your SG must be up in the 3 plus range from that 1-9 twist?
 
Just stay away from the Hornady ELD line and you should be safe, hahaha.
 
How tight are the necks? Have 500 Lapua 300 PRC cases sitting in a unopened box. Haven't had a chance to inspect them yet.
 
How tight are the necks? Have 500 Lapua 300 PRC cases sitting in a unopened box. Haven't had a chance to inspect them yet.

Well...I'd tell ya...but this is a family friendly site ;) REAL tight....like you better lube them...and mandrel them...and chamfer them with a VLD cutter...and they are still rather tight.
 
  • Like
Reactions: Glenn and robb_va
Perfect, should fire form that 40 degree shoulder nice and tight :LOL:
 
Well...I'd tell ya...but this is a family friendly site ;) REAL tight....like you better lube them...and mandrel them...and chamfer them with a VLD cutter...and they are still rather tight.
They are too tight. I loaded without doing anything to the necks, and to pull a few bullets from my ladder that would have been too hot, I had to whack the ram handle once I had the collet tightened to the bullet. Normally it is just an easy press.

Overall pulled 219 215 Berger bullets today from ammo loaded for rifles I no longer have, so at least I should be good on my PRC and 300 Norma for a while.
 
How tight are the necks? Have 500 Lapua 300 PRC cases sitting in a unopened box. Haven't had a chance to inspect them yet.

Tight.

PM me your address and I will send you some non-lubing expander mandrels.

expanders.jpg
 
How tight are the necks? Have 500 Lapua 300 PRC cases sitting in a unopened box. Haven't had a chance to inspect them yet.
They are OK after neck turning to 0.013 and a 0.307 mandrel.
 
Is there a guess as to how fast the 250 a tips can be pushed before any threat of failure in an 8 twist barrel? I have a couple hundred on the way
 
Is there a guess as to how fast the 250 a tips can be pushed before any threat of failure in an 8 twist barrel? I have a couple hundred on the way
I would say there is absolutely zero chance of blowing up an A-tip with a 300 PRC. You aren't going to get the velocity to do so.
 
Is there a guess as to how fast the 250 a tips can be pushed before any threat of failure in an 8 twist barrel? I have a couple hundred on the way

I've shot them 2950ish in my 37" barrel just seeing how fast they'd go and no problems. It's a half-dozen of one, 6 of the other thing with the 230 vs. 250. Slightly better wind vs. less elevation. By 2000yd they're about the same thing.
 
  • Haha
Reactions: bunny too
"Estimated to ship in 1-4 months"
Last time I ordered them I got them within a couple weeks. I feel it is better than nothing. I'm coming up empty handed and running low on components so if something pops up elsewhere I can always cancel the order.
 
Last time I ordered them I got them within a couple weeks. I feel it is better than nothing. I'm coming up empty handed and running low on components so if something pops up elsewhere I can always cancel the order.

My experience with them, at least as far as bullets goes, has been the opposite. I e had two different orders in for 212 and 220 ELDs since last year and every time the expected ship date comes up I get another email telling me it’s been pushed out. My 212s were “expected” yesterday. I’ll eat my words if they ship any time soon.
 
  • Like
Reactions: JBarton
So after bedding my MPA and the scope base and lapping the rings, my groups definitely shrunk, and although they are not all that impressive I think if I can figure out where the vertical stringing is coming from this can be a .25” - .33” gun. I may need to mess around with the brake, as JBartons experience has indicated.

In the photo with 6 groups, those are 2” dots. They are 1” in the other three.

I’m shooting from a rest on an old rickety wooden spool, so that’s one of my problems I need to address. I’ll be shooting from an RRS ascend/anvil normally, but for load development I wanted free recoil. I was also racing the rain that day so I might have been subconsciously rushing the trigger too. First set of groups are what I was getting before bedding/lapping.

Range is 100
Load: ELD220 on 76.2 Gr. of R25 in Hornady brass with CCI #34 primers (all I have) bullets seated .002” from the lands.

Rifle:
MPA BA ultralite
Bighorn Origin
Proof Carbon prefit
TT special
PA hypertap brake
Vortex AMG 6-24 in Seekins rings (picture is from another day)
 

Attachments

  • D2712C82-531D-4944-AFAA-3A40C26C310E.jpeg
    D2712C82-531D-4944-AFAA-3A40C26C310E.jpeg
    883.7 KB · Views: 102
  • 31F38769-CE0E-4481-B5C3-F00E7B365F0F.jpeg
    31F38769-CE0E-4481-B5C3-F00E7B365F0F.jpeg
    540.1 KB · Views: 107
  • 7CB39CFB-26E8-4CDE-92AC-B7EF6AB3B04B.jpeg
    7CB39CFB-26E8-4CDE-92AC-B7EF6AB3B04B.jpeg
    327 KB · Views: 102
  • 7887E909-13CD-4D76-8C7B-B18070046BB1.jpeg
    7887E909-13CD-4D76-8C7B-B18070046BB1.jpeg
    399.5 KB · Views: 75
  • AFC3CE9C-4D4A-47B1-8FEC-E14A4CB7B286.jpeg
    AFC3CE9C-4D4A-47B1-8FEC-E14A4CB7B286.jpeg
    542.3 KB · Views: 111
Last edited:
So after bedding my MPA and the scope base and lapping the rings, my groups definitely shrunk, and although they are not all that impressive I think if I can figure out where the vertical stringing is coming from this can be a .25” - .33” gun. I may need to mess around with the brake, as JBartons experience has indicated.

In the photo with 6 groups, those are 2” dots. They are 1” in the other three.

I’m shooting from a rest on an old rickety wooden spool, so that’s one of my problems I need to address. I’ll be shooting from an RRS ascend/anvil normally, but for load development I wanted free recoil. I was also racing the rain that day so I might have been subconsciously rushing the trigger too. First set of groups are what I was getting before bedding/lapping.

Range is 100
Load: ELD220 on 76.2 Gr. of R25 in Hornady brass with CCI #34 primers (all I have) bullets seated .002” from the lands.

Rifle:
MPA BA ultralite
Bighorn Origin
Proof Carbon prefit
TT special
PA hypertap brake
Vortex AMG 6-24 in Seekins rings (picture is from another day)
I really think the stringing is coming from the firing point. Looks pretty unstable, you might consider putting the rest on a prepared spot of ground or off the pickup bed and shooting prone?
 
I really think the stringing is coming from the firing point. Looks pretty unstable, you might consider putting the rest on a prepared spot of ground or off the pickup bed and shooting prone?

Yeah I’ve had that thought. Also considering bracing the spool up with 2x4s. It sits flat and solid but it’s so old that it is pretty rickety.
 
I'd say the stringing is coming from whatever that rest is....just throw an Atlas on the front and shoot. Always practice your groups exactly the way you intend to shoot for reals.
 
What bushing are you guys using for Lapua brass? Mine should be here this week!

I'm using a .336 bushing with my Lapua brass.....un-turned necks...however....I'm only putting 10inch/lbs of force on seating....that may be too loose of a neck tension for most....I feel a .334 is a little tight at the moment....I don't have a .335. However, I'll probably end up turning necks...because I'm a nerd....so I'll have to revisit different bushings then.
 
  • Like
Reactions: Glenn
What bushing are you guys using for Lapua brass? Mine should be here this week!
.335, although I haven’t shot the Lapua yet. Tried Hornady with 336,335,334 and settled on 335. Have loaded up a 30 round OCW ladder with Lapua, hopefully will get to try it out next weekend.
 
Hi guys, has anybody used standard large rifle primers instead of L.R. magnum primers in 300 PRC? Can't find any magnum primers in stock.
 
Hi guys, has anybody used standard large rifle primers instead of L.R. magnum primers in 300 PRC? Can't find any magnum primers in stock.
Not with 300 PRC, however I have used them in 300 Win Mag with good results. I didn't see much velocity difference with them but I did see an SD/ES difference with the Magnum primers, so I ended up using the FGMM Magnum primers in my final load for that rifle. H1000 powder if it matters.
 
  • Like
Reactions: vergil
Hi guys, has anybody used standard large rifle primers instead of L.R. magnum primers in 300 PRC? Can't find any magnum primers in stock.
I've been using Federal 210M primers with no issues, @b2lee says that my SD/ES should come down with the 215M's so I'm on the lookout for some and will post results.
 
  • Like
Reactions: vergil
Hi guys, has anybody used standard large rifle primers instead of L.R. magnum primers in 300 PRC? Can't find any magnum primers in stock.

I have used BR-2s since the get go. I did some testing with 215Ms vs BR2s and saw slightly higher ES/SDs with the 215s, so decided to stick with the BR2s. The key issue MAY BE in colder weather where the extra flash from the 215Ms will help ensure the powder fires evenly. For me, that's not an issue. I'm a little bit of a weather snob when it comes to shooting :)
 
  • Like
Reactions: vergil
I'm using a .336 bushing with my Lapua brass.....un-turned necks...however....I'm only putting 10inch/lbs of force on seating....that may be too loose of a neck tension for most....I feel a .334 is a little tight at the moment....I don't have a .335. However, I'll probably end up turning necks...because I'm a nerd....so I'll have to revisit different bushings then.
I am currently running a Forster FL die with the .3085 expander ball (Hornady once fired, annealed, and chamfered with Henderson Trimmer) and am having issues with the seating pressure exceeding 100psi with Berger 245s. I am using the 21st Century Hydro press and with a wilson die. 21st Century is sending me a 200psi handle for the press. I have not tried the Lapua brass yet, but all this talk about tight necks has me curious. Shoot if I am already at this PSI with Hornady brass, I am only guessing it will be higher with the Lapua Brass. How are you only getting 10psi? I don't have all the measurements handy now, but with the .3085 expander ball and bullet diameter, I am at 1thou of neck tension.
 
expander ball or expander mandrel? And you mic'd it to make sure it is correct? 100PSI seating will give you some unwanted runout....and cause frustration. I can seat my bullets using a K&M arbor press with two fingers...and that throw lever is really short...no leverage at all.

Hornady brass is soft...so you shouldn't have any problems if you annealed, mandreled and chamfered. spray some one shot down in the necks...and if you still get 100PSI...something is very very wrong.
 
  • Like
Reactions: Glenn
Someone in Discord asked me to post a video of the AMP Mate running some 300PRC brass. Please forgive the shaky cam footage...I couldn't find my camera tripod. Just a quick short showing the function. Some say it is slightly pornographic in nature.

 
Someone in Discord asked me to post a video of the AMP Mate running some 300PRC brass. Please forgive the shaky cam footage...I couldn't find my camera tripod. Just a quick short showing the function. Some say it is slightly pornographic in nature.


I need to set mine up...
 
I am currently running a Forster FL die with the .3085 expander ball (Hornady once fired, annealed, and chamfered with Henderson Trimmer) and am having issues with the seating pressure exceeding 100psi with Berger 245s. I am using the 21st Century Hydro press and with a wilson die. 21st Century is sending me a 200psi handle for the press. I have not tried the Lapua brass yet, but all this talk about tight necks has me curious. Shoot if I am already at this PSI with Hornady brass, I am only guessing it will be higher with the Lapua Brass. How are you only getting 10psi? I don't have all the measurements handy now, but with the .3085 expander ball and bullet diameter, I am at 1thou of neck tension.

Are you using graphite lube? See thread below where I'm capturing data to fine tune using a mandrel.

 
Someone in Discord asked me to post a video of the AMP Mate running some 300PRC brass. Please forgive the shaky cam footage...I couldn't find my camera tripod. Just a quick short showing the function. Some say it is slightly pornographic in nature.



You are far more of a tech geek than I am...
 
I'd say the stringing is coming from whatever that rest is....just throw an Atlas on the front and shoot. Always practice your groups exactly the way you intend to shoot for reals.

Yeah, I’m going to mess around with it. I got an earful from Boyd Allen over on accurate shooter for using my RRS and not doing load development from a free recoiling rest, so that’s what your looking at there. I think the spool it is sitting on is more suspect than the rest itself. If I stick with the rest I’ll probably put a bag under the front end to though.
 

151 in stock at posting.
 
Are you using graphite lube? See thread below where I'm capturing data to fine tune using a mandrel.

I will try some graphite lube once I get the 200psi handle. Thanks!
 
 
There is no consensus...we all think our choice is the best. I use the LE Wilson FL Bushing die.
 
Was looking at that one earlier, is it sizing the brass correctly? Any issues?

They all basically size the brass correctly....but a bushing die gives you more options on sizing your neck.....no issues....it may have not been the reasons for me winning....but it never cost me a match.

I like the fit and finish better than the other brands I have used.