6gt
- Thread starter Dthomas3523
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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.
I'm on the list for 109 ELD's once they arrive at GAP, till then I figured I'd try some factory ammo until they come in. The ammo in my rifle seems to be holding around .6 moa vertical at distance with the occasional flier that will open things up to moa at times. Velocity is 2927 sd-7 es-16 for the five I tested from my 24" Bartlien 4R 7.5 twist 400mod BB barrel and chambered with the .120 freebore reamer.
For those interested in the Hornady ammo, they measure very consistent. Using a SAC bullet comparator, base to ogive is 1.869" on the 10 that I measured and COAL was [email protected] [email protected] [email protected] [email protected]
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Moved my scope back a tooth on the rail. Dropped by the range to check zero. This is the GA Precision Hornady Factory 109 again but 10 shots at 100.
Agree, cci 450's is all I use and while I'll capture speed on a few to assist my 4Dof profile I measure vertical at distance more now... and the tighter ones do not always the tightest sd/es.
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?
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.
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.
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.
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.
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.
Attachments
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)
Contact the smith that’s going to chamber your barrel.
He should have a pretty good idea.
Lots of load data in this thread. Go back to beginning and read through it.
It's been my experience that performing a ladder test before barrel break in is a waste of time.
After 90 rounds my barrel sped up by 35fps. Some of the nodes I thought were good at 50 rounds were not as good as ones identified at 150.
Having said that Varget has some big and easy nodes. Save the throat erosion and load easy to brake in 32.5 is a good spot right around 2800fps.
My 2 cents.....
I’ve read and googled a lot. I have 112 match burners and I want to try reloder 16. I’ve only seen info for 105gr. Newer to reloading and wanted to get an idea so I don’t mess anything up. Thanks
@dmitchell09 this is on page 14 of this thread. I know there is more here too, so try going through this thread.
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 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 a slight bit, and settled into 2885fps with 33,6g of Varget under a 105. Seems to be a fairly common node.
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.
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.
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.
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.
I would keep it as is.
Current running 31.8 Varget with 109 LRHT. 40 thou jump. 2860 fps. This is my fourth barrel.
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.
105bthp 4166 32.4 2820fps when barrel was new, now 2852fps
112MB RL16 37.3 2910fps new, now 2955
I clean barrel after every shooting session. Just how I was trained. Clean barrel is the only predictable standard...IMO
Bartlein 26" 5r 7.5 to 1 stainless, Defiance action
1230 current round count. I saw a significant speed increase around 150 rounds.
Both loads shoot consistent 1/4" groups
I have 70fps from first few rounds to 177 round count on this new barrel. The other 3 were about the same 50-100fps.
Isn’t the Bat M geared towards a long action?
I think the B action would be better for the GT if you’re set on running one.
It's what I use exclusively, work very well. Hell, everything works well with this
My modbb barrel hasn't sped up.... It's right around 2850 after 700 rounds same as the beginning of load development
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.
If you plan on running a can, I’d go 24 or even 22”.
With a 26” barrel and a suppressor, you’re looking at 32” or longer and sticking that through a barricade can be a PITA.
If you’re running a break, 26” is probably the most common.
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.
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.
I trued to 2920 fps on the 1,000yd steel on Friday, with 112gr Match Burners over 36.7gr RL16 in a 23" barrel. Went a little shorter because I shoot suppressed all the time and wanted to keep barrel + can under 30", figured I could still go at least as fast as long barrel Dasher with the slightly bigger GT case.
As for cans, I like my Nomads, I use the Nomad 30 on the GT a lot, and I use my Nomad Ti on some of my hunting guns. If I were doing it over, I'd get two Nomad Tis, as I don't have a machine-gun or run .223 SBRs hard or anything like that. I do have the E-brake that I mount to my Nomad 30 sometimes and it makes a difference.
Here's the rifle and can so you can see what the total length looks like.
As for cans, I like my Nomads, I use the Nomad 30 on the GT a lot, and I use my Nomad Ti on some of my hunting guns. If I were doing it over, I'd get two Nomad Tis, as I don't have a machine-gun or run .223 SBRs hard or anything like that. I do have the E-brake that I mount to my Nomad 30 sometimes and it makes a difference.
Here's the rifle and can so you can see what the total length looks like.
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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 bore
I'm running a 28' 1:7 barrel and getting 3004 fps with 33.66g Varget and 105 Target Hybrids.
After a regional match, some practice rounds and now freshly cleaned, this Benchmark from Straight Jacket Armory is at 3535 rounds fired as of today. Group contains clean cold bore too 
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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.
It's not a picatinny mounts. It's a 10 mm spacer directly attached to the DPP mount Spuhr also offers.
I 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?
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 have to run a mag spacer kit in my AW mags for my Zeus and 6GT. Single stack mags will work fine without a spacer.
