I got a few cases of factory loaded ammo from GA Precision about two weeks ago and 4Dof has the 109 ELD's now. While confirming my data I used the 98% axial form factor to get everything to match up from 100-1000, and if your wanting a single BC value that would put it around .297g7 in my rifle. The 109 Berger hybrid, which is what I have been using for the past couple years, again using 4Dof and a 96% axial form factor to "True it" in my rifle equals out to around a .303g7, YMMV.Any one shoot some 109 bergers next to some 109 eldm's? I am almost out of 108 bergers and keep hearing good feedback on the eldm's.
Yes. Actually the 450’s are the more used. They work great.Are you guys getting good es and sd using cci 450 small rifle magnum primers in the 6gt? I wanted to go with fed gm205m but can't find them. So im wondering if im going to be getting larger es and sd going with cci 450 primers in the 6mm gt. Please let me know guys thank you.
Very similar to the 450’s. In fact, I’d be surprised if you saw any velocity or SD difference over the 450’s. Good to go.Anyone use br-4 primers while we are on the topic? I picked up a few thousand but just been using up my 450’s. Anyone see a noticeable difference between the two?
If Bigfoot holding your target?Best group I've shot in life. This group was at 300 yards.
Bartlein 26" Defiance Tenacity, GAP PPR
4166 32.4
S&B primer
Hornady brass
.040 off
105 Hornady Bthp
1182 rounds on barrel.
2852 fps
8 Es with 30 rounds, yes 30
3.1 Sd
I confirmed zero at 100, as well as warmed up barrel with 5 shots, then moved out to 300 and shot this group.
Only a 3 shot group but after the results I was so excited didn't want to screw it up.
Quite an interesting result for this cartridge. I am getting similar results with the 103gr 13 Ogive with 4064 with 54 thou of jump. I am getting extremely low SD's and at 13 mph wind at 9-3 o'clock there is little left to right switch. (I will post results)I'm pretty happy with RL16 in the GT, just need to find more of it. Ran my loads of 36.3gr under 109 gr Hybrid 80 off, and 36.7gr under 112gr MBs 60 off out to the 600, 750 and 1,000 plates last week and results were good given the really switchy winds.
Yesterday winds were pretty much from 12 o'clock, and I was able to put together this (good for me) group on a 1,000 yd plate. 1,250 yds fell apart to about 19 inches, lol. Plenty of work to do. Accurate mag, the only one that feeds flawlessly in my rifle, for scale.
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Contact the smith that’s going to chamber your barrel.Im in the process of building a 6gt rifle for prs. I have all the components to start loading ammo. But its going to be a while til I have everything to complete my rifle. I want to get 20 rounds loaded for a ladder test so that I have them ready right when my rifle is done. Can anybody tell me what I should load Berger 105 hybrid targets for c.o.l.? My barrel has not been chambered and im not sure on what freebore to go with. Id appreciate suggestions on c.o.l. for Berger 105 hybrid targets and on what length of freebore for those bullets would be best. Thanks, Kaden.
Im in the process of building a 6gt rifle for prs. I have all the components to start loading ammo. But its going to be a while til I have everything to complete my rifle. I want to get 20 rounds loaded for a ladder test so that I have them ready right when my rifle is done. Can anybody tell me what I should load Berger 105 hybrid targets for c.o.l.? My barrel has not been chambered and im not sure on what freebore to go with. Id appreciate suggestions on c.o.l. for Berger 105 hybrid targets and on what length of freebore for those bullets would be best. Thanks, Kaden.
What length freebore are you running on your 6gt? Im building one and am needing opinions on what freebore to go with. 105 Berger hybrid target is what im using and I noticed you have loads for the 105. and case overall lengths with the 105.
It's been my experience that performing a ladder test before barrel break in is a waste of time.Also im using brand new alpha ocd brass with cci 450s, varget, and Berger 105 hybrid targets. What would be a good starting load powder wise? And a good stopping point on the ladder test for powder weight?
Hmm, I call it weirdness because I've been loading a bunch of different chamberings for a while now, and I've never seen a bullet lot change jack pressures like that. For reference, that's the same velocity that 40.3gr (0.8gr more) of StaBall gave me at 80 deg (25 deg warmer). I've used two other lots of this bullet, and there was no noticeable difference in velocities between them.
A new lot of cases with significantly lower capacity could definitely jump pressures, but I checked the water capacity on these when I got back, and trimmed the same they *may* be 0.1gr less... not nearly enough difference to explain what I measured. That's why it's weird to me, the only other thing I can think of is maybe the new cases are significantly undersized until they get blown out in the first firing, and are changing the powder burn characteristics quite a bit? Still seems like a lot though.
This barrel only has 300-400 rounds on it, and has honestly been surprisingly picky, but I guess I can't rule out a ring. I've cleaned pretty regularly, but I should probably break out the bore scope and check things out.
I did try some RL16 (my all around favorite medium rifle powder if I had to pick one) with the 112gr. Groups weren't impressive at the lower loads, but started to come together at 36.7gr and 37gr. More work to be done in that area, but here were the (only one shot) velocities:
112gr MB, Hornady Gap cases, 450s, 60 thou off the lands. 23" PVA prefit.
RL16
35.8gr - 2,849 fps
36.1gr - 2,887 fps
36.4gr - 2,874 fps
36.7gr - 2,915 fps
37gr - 2,901 fps
I Chrono'd 37gr of RL16 in the old cases with an older lot of bullets on the same 35deg trip mentioned above at 2,895 fps. So same components shift as with the StaBall load above didn't really change much, certainly not a 70fps change.
Mine sped up a slight bit, and settled into 2885fps with 33,6g of Varget under a 105. Seems to be a fairly common node.What kind of increase in speed (from a new barrel) have you guys been seeing with your GT??
I got-
107smk
33.8 gr Varget
Cci 450/alpha brass
.060 off
26” 1 in 7.5 Bartlein
@ 2880 fps with 80-90 rounds on the barrel…
The rifle just seems to be happy right there, (accuracy/consistency wise) so I’m gonna ride it out till everything settles….
Safe to assume I’ll be around that 2920 speed when the dust settles?
Mine sped up about 20-30fps.What kind of increase in speed (from a new barrel) have you guys been seeing with your GT??
I got-
107smk
33.8 gr Varget
Cci 450/alpha brass
.060 off
26” 1 in 7.5 Bartlein
@ 2880 fps with 80-90 rounds on the barrel…
The rifle just seems to be happy right there, (accuracy/consistency wise) so I’m gonna ride it out till everything settles….
Safe to assume I’ll be around that 2920 speed when the dust settles?
You may have developed a carbon ring. I’ve been through quite a few barrels and have experienced them many times. Usually around 450-500 rounds. Give it a good scrubbing.This is recently with my third barrel. All the same powder charge of 35.9yr H4350 and 109.
First 20 rounds = 2816
At ~100 rounds = 2844
At ~175 rounds = 2880
At ~275 rounds = 2910 with one round as high as 2954 at this last match.
Not sure what it is now after the match and sitting with almost 500 rounds.
There is a very good chance of that. I too need to clean the chamber and throat out every ~300 rounds to get rid of that carbon ring with my last two barrels. I can see it develop with a scope. I did scrub the hell out the barrel and throat last week but I had also done it around the 100 round mark too. My last two barrels stopped speeding up around the 400-500 mark and each time had seen around a 100fps increase. They were stable after that. Finally going to do an OCW in the next week or so to find out what she likes down her hole.You may have developed a carbon ring. I’ve been through quite a few barrels and have experienced them many times. Usually around 450-500 rounds. Give it a good scrubbing.
I would keep it as is.What kind of increase in speed (from a new barrel) have you guys been seeing with your GT??
I got-
107smk
33.8 gr Varget
Cci 450/alpha brass
.060 off
26” 1 in 7.5 Bartlein
@ 2880 fps with 80-90 rounds on the barrel…
The rifle just seems to be happy right there, (accuracy/consistency wise) so I’m gonna ride it out till everything settles….
Safe to assume I’ll be around that 2920 speed when the dust settles?
I run two different load/bullet combos based on how extreme wind conditions are and max target range. Matches at my home range go out to 1450yards so use a 112MB for better reach.What kind of increase in speed (from a new barrel) have you guys been seeing with your GT??
I got-
107smk
33.8 gr Varget
Cci 450/alpha brass
.060 off
26” 1 in 7.5 Bartlein
@ 2880 fps with 80-90 rounds on the barrel…
The rifle just seems to be happy right there, (accuracy/consistency wise) so I’m gonna ride it out till everything settles….
Safe to assume I’ll be around that 2920 speed when the dust settles?
Isn’t the Bat M geared towards a long action?Im looking to purchase an action for my 6gt build. Will a Bat Action: Mod M - Bolt Right - Dual Port - 1.55" Round - 308 Face work for my 6gt prs rifle build?
It's what I use exclusively, work very well. Hell, everything works well with thisAnyone use br-4 primers while we are on the topic? I picked up a few thousand but just been using up my 450’s. Anyone see a noticeable difference between the two?
My modbb barrel hasn't sped up.... It's right around 2850 after 700 rounds same as the beginning of load developmentWhat kind of increase in speed (from a new barrel) have you guys been seeing with your GT??
I got-
107smk
33.8 gr Varget
Cci 450/alpha brass
.060 off
26” 1 in 7.5 Bartlein
@ 2880 fps with 80-90 rounds on the barrel…
The rifle just seems to be happy right there, (accuracy/consistency wise) so I’m gonna ride it out till everything settles….
Safe to assume I’ll be around that 2920 speed when the dust settles?
A 26" is fine. I used to run a 28" barrel, and still like it, but it just isn't anything you need. The GT has no issues achieving good velocity.I went with the bix n Andy tac sport pro. And an ec tuner brake. Yes it is long. What would you recommend for length if you don't mind me asking. Im thinking ill have my smith cut it down to 26" finished length.
Is this a PRS rifle? Bench gun? Hunting rifle?What would you guys recommend I have my smith cut my barrel at length wise? Its 29" but from what I've seen 26" is the go to for prs in the 6gt. Its a 7.5 twist.
If you plan on running a can, I’d go 24 or even 22”.Prs rifle
You’ll typically lose velocity with a shorter barrel.Is there noticeable effects downrange between a 26" and 22" barrel. Id like to do what your saying but Im new to this and don't know what the downrange effects of going 4" shorter would be on the 6 gt
This should be pretty easy. I’m pushing 112s at 2800 with a 24” barrel and a can with 36g H4350. And I’m not pushing it.Im leaning towards going with a 24" That aint much of a velocity loss. Ive heard of people getting around 3000 fps out of the 6gt and im wanting to stay around 2800-2900 with Berger 105 hybrid targets.
I plan on running the KGM R-6.5Thinking im going to purchase another can for this rifle since the one Im waiting on is for bigger calibers. Im thinking about going with the silencer co omega 300. What are you guys running on your 6gt?
Area419 Maverick if you're shooting PRS. The recoil impulse is similar to a brake. I own a ton of cans (including an Omega) and while the Omega300 is good, it's not one I would suggest at all on a PRS gun.. KGM is a good alternative.Thinking im going to purchase another can for this rifle since the one Im waiting on is for bigger calibers. Im thinking about going with the silencer co omega 300. What are you guys running on your 6gt?
Forgot to add that velocity for this rig with the factory Hornady 109 ELD-M load settles in around 2805 fps. The barrel is a Krieger 4 groove .237 boreMine is like 22-3/8". I like the length as the intention is to run a suppressor nearly full time. 105 HVLD's shoot well at 2865 and 2930. 105 hybrids shoot well at 2900
What would you guys recommend I have my smith cut my barrel at length wise? Its 29" but from what I've seen 26" is the go to for prs in the 6gt. Its a 7.5 twist.
What size picatanny rail is on top of the spuhr mount?Area419 Maverick if you're shooting PRS. The recoil impulse is similar to a brake. I own a ton of cans (including an Omega) and while the Omega300 is good, it's not one I would suggest at all on a PRS gun.. KGM is a good alternative.
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It's not a picatinny mounts. It's a 10 mm spacer directly attached to the DPP mount Spuhr also offers.What size picatanny rail is on top of the spuhr mount?
YepI realize this might be a dumb question, but I'm going back and forth between ordering a Dasher or GT.
It seems like a common Dasher load is a 109 Hyb running 2875-2900. Which sounds like where a lot of people are running their GT (with slightly more powder)
If that's the case, is it just about feeding and mag kits?
I run slower speed in the summer and higher speed in the winter.Sounds like you can run your GT 50-75fps faster than a Dasher, if you wanted to