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Range Report 6GT Project/Range Report
- Thread starter NorCal Vu
- Start date
Tried out some VV N555 with 105 hybrids this weekend.
Impact/ 26" Bartlien from Stuteville 7.5 twist/
new Alpha brass/ CCI450
37.2 was 2960 fps sd-3.9 es-8
A drop tube would be helpful, as it seems to be fairly a bulky powder.
Impact/ 26" Bartlien from Stuteville 7.5 twist/
new Alpha brass/ CCI450
37.2 was 2960 fps sd-3.9 es-8
A drop tube would be helpful, as it seems to be fairly a bulky powder.
Yes indeed, 37.0 of Reloder 16 looks verrrry promising with 105s, if a bit fast.
Pic 1
200 yard 8 shot groups of 36.0, 36.5 and 37.0.
37.0 is obviously good, but MV was 3010. No obvious pressure signs, but will definitely check for pocket looseness on the next loading.
Previously tested loads are still doing great.
Pics 2 and 3
300 yard group with 36.0 of H4350 behind a Barnes 112 MB was looking awesome . . . until I yanked the fifth shot. @#$%^&! Same load was also okay on 510 yard steel. MV was 2900. Note to self: get more 112s, cut back on the crystal meth coffee.
Pics 4, 5 and 6
200 yard group showing the clean cold bore DOPE change.
400 and 510 yard groups on steel with 33.5 of Varget behind a 105 RDF. 2950 MV.
All loads with 1x or 2x fired Hornady brass, FL sized with .267 bushing. CCI 450 primers. Bipod and rear bag on a bench. ~3-5 mph 9 o'clock wind, ~90 degrees F, 75% relative humidity, near sea level.
I also made my own 'Mark & Sam' style steel bar bag rider for the KRG. Seems to help.
Pic 1
200 yard 8 shot groups of 36.0, 36.5 and 37.0.
37.0 is obviously good, but MV was 3010. No obvious pressure signs, but will definitely check for pocket looseness on the next loading.
Previously tested loads are still doing great.
Pics 2 and 3
300 yard group with 36.0 of H4350 behind a Barnes 112 MB was looking awesome . . . until I yanked the fifth shot. @#$%^&! Same load was also okay on 510 yard steel. MV was 2900. Note to self: get more 112s, cut back on the crystal meth coffee.
Pics 4, 5 and 6
200 yard group showing the clean cold bore DOPE change.
400 and 510 yard groups on steel with 33.5 of Varget behind a 105 RDF. 2950 MV.
All loads with 1x or 2x fired Hornady brass, FL sized with .267 bushing. CCI 450 primers. Bipod and rear bag on a bench. ~3-5 mph 9 o'clock wind, ~90 degrees F, 75% relative humidity, near sea level.
I also made my own 'Mark & Sam' style steel bar bag rider for the KRG. Seems to help.
Attachments
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1. 6GT-105-RDF-RE-16-36.0-36.5-37.0-200-yards-200830.jpg -
2. 6GT-112-MB-H4350-36.0-300-yards-200830.jpg -
3. 6GT-112-MB-H4350-36.0-510-yards-200830.jpg -
4. 6GT-105-RDF-Varget-33.5-200-yards-200830.jpg -
5. 6GT-105-RDF-Varget-33.5-400-yards-200830.jpg -
6. 6GT-105-RDF-Varget-33.5-510-yards-200830.jpg -
7. 6GT-bag-rider.jpg
Have used N555 w/ 105s / CCI450 and BR4/ Alpha brass. Would probably do better with the 109s or something heavier (110 SMK or DTACs)
Speeds were 2950 ish and high single didgit SD.
3 at 100 yds during seating depth test
Speeds were 2950 ish and high single didgit SD.
3 at 100 yds during seating depth test
What charge weights did you use for n555?
nm looks like you used 37.2. Looks promising, going to test n555 out here soon.
Start around 35.6 and work up. If you're going to use a 110 or 115, start around 35.
Here's a small test I did at 100 yds with 110 A-Tips to check jump sensitivity with the 6GT.
https://www.snipershide.com/shooting/threads/110-a-tip-jump-test-results.7035149/#post-8941113
https://www.snipershide.com/shooting/threads/110-a-tip-jump-test-results.7035149/#post-8941113
Has anyone tried Reloader 15 yet? Varget is hard to come by these days and I still have a few lbs of RL15.
I've tried RL 16 and Varget. You might have some luck with RL 15 but I'd start somewhere around 32 ish.
Has anyone come up with a decent 115gr DTAC load yet? Decent velocity?
I havent landed on what bullet I wish to use yet. The 109gr Berger, the 110gr SMK, and the 115gr DTAC are all in the hunt. Im wanting something in the 2900 to 2950fps range. Not really wanting to run a 105gr at 3k.
I havent landed on what bullet I wish to use yet. The 109gr Berger, the 110gr SMK, and the 115gr DTAC are all in the hunt. Im wanting something in the 2900 to 2950fps range. Not really wanting to run a 105gr at 3k.
I run DTACS at 2860 with 34gr varget. SD’s around 5-8. Hornady brass and CCI 450. Have plenty of room to push them faster but this is fine for me. Could also run 36.3 gr H4350 at 2820.
34.8 gr varget put me at 2900ish
Any actual nodes just over 2900fps that didn't feel like you were pushing pressure?
It seems like 2900 to 2950fps with heavier bullets ought to be the small advantage that the GT offers over the Dasher if people want to take advantage of it.
I dunno I’m thinking 105’s at 3000 is the way to go.
I’m currently running 108 eld’s at 2980 and Alpha brass shows a little pressure but it’s just ejector stamps.
a buddy runs 105’s at 3050 and has great luck with them.
I’m currently running 108 eld’s at 2980 and Alpha brass shows a little pressure but it’s just ejector stamps.
a buddy runs 105’s at 3050 and has great luck with them.
Varget gave me some pretty big nodes that I’d be fine shooting in. I think any of these charges would have shot well. This was my data. I didn’t find pressure until closer to 3000. Obviously yours may be different as you test.
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A bullet I’m going to try out is the 115 gr RDF, I did a basic pressure test yesterday and going to do ladder testing next time I go out. I’ll let you know what numbers I’m getting there but at 36 gr of H4350 I was getting 2860 with an SD of 5 and at 36.5 gr I got 2916 with an SD of 8
109’s are the most consistent bullet I’ve ever run. Running them in 6br, dasher, 6x47. And have run them in 6gt as well.
The Hornady Atips are the most consistent bullet I've ran. Across all my calibers.
Yes, they are! Spent two days ROing at the Federal Gold Medal matching in Alabama and it opened my eyes on the A-tips. I could easily tell when a shooter was using them by trace in the wind plus the spark on the plate was awesome. They are truly a cheat code at times.
That's one of those deals, where at that price, they damn well better be...
And they are! Lead core weight with near solid BC.
ATips are slightly better than 109’s but not better enough to justify double the price IMO. My first load I developed with the 6GT was with Atips and my load for the 109’s was the same charge weight and same speed. There was only .1 difference at 1K so I went with the 109’s at half the price. Have gone through 4 different lots and they’re very consistent.
49-55 cents each isn't bad. What do the Bergers run ?
I sure as hell don't put 2 ply tires on my trucks either...
I sure as hell don't put 2 ply tires on my trucks either...
And thats probably a good load. For me personally it doesn't give me anything over my 22BR. Running 88gr ELDMs at 3000fps over 28.5grs of Varget gives a 7.1 mil elevation at 1000 yards and 1.9 mils of wind in a full value 10mph crosser. The 105gr Hybrid is 7 mils elevation and the same 1.9 mils of wind.
The 22BR is incredibly soft shooting and inexpensive to run. But I'm looking for a heavier bullet that will hold the wind a little better. So something 109gr and above in the GT is what I'm exploring. Ideally a DTAC at around 2950fps is what I wanted. If there's a good node in that velocity.
For what it’s worth I’m sitting at 2900 with 105s over 36.5grs of h4350. 1000 is 8.1 wind 1.9 at 10 mph.
At 4000fps? LOL
My ballistic calculator is showing 1.7 mils at 1000 w/10mph at 3000 fps (which I'm skeptical is safe in a 6GT).
My load at 2800 fps is 1.9 mils at 1000.
I get 7.6 and 2.0 when I punch that in.
I'm probably at a higher elevation. And I'm using a 9 o'clock wind with a right twist barrel. Not a 3 o'clock wind. There is some offset in spin drift between the two wind directions.
Playing with numbers in GRT I’m getting about 62k psi for RL16 driving to 3000fps, and 65k with Varget. Probably best to go to a 6 Creedmoor for that.
You have 0.7 mils of spin drift at 1000 yards? Do you have a 1:4" twist barrel?
Something is way wrong with that. 1.2 mils of wind drift is not correct for a 110 A-Tip at 2940 fps.
Closer to 1.6-1.7 probably right? I’m guessing it’s a 6mph gun
I’ve shot A-Tips at 2840fps out to 1350 and can assure you those numbers make no sense.
If I take 2940 fps and crank the DA up to 13,000 ft it brings the windage needed way down, but also drops the elevation needed way down to 6.2 mils as well. Can’t have 7.0 mils of elevation and 1.2 mils of wind unless your calculator has the wrong wind, or some crazy coriolis and aerodynamic jump.
I've shot out to 1540 yards... the data jives. Gladly invite ya here to shoot with me. My steel is always set up.
I'm not sure what I posted up that translates into .7 mils spin drift. I have a 7" twist barrel that gives me 5" or .2 mils of spin drift at 1000 yards, according to Applied Ballistics.
Yeh, big elevation difference. I'm in Idaho.
Also you have your 10mph wind coming from 90 degrees/3 o'clock. Switch that to 270 degrees/9 o'clock and you'll see a difference. Unless of course you have no spin drift calculation entered.
When I swing the wind around to 3 o'clock I get this...
What powder are you using for that load. I have tons of Varget for my BR. Hoping to stick with it for a heavier bullet GT round.
My load with A-Tips was 34.6 varget on Hornady brass with CCI 450’s. Gave me 2950 with zero pressure issues.
I'm now 120 rounds into my 6GT.
I shot 100 rounds of 33.5gr Varget, new Hornady brass, and Winchester primer. Tested the 108 ELD, 112 match burner, and 109 hybrid. The hybrids shoot the best with the Hornady ELDs coming in a close 2nd. I can't get the 112s to shoot better than .75 moa.
I ran 20 rounds over a chrono today for OCW testing. I am not quite getting the velocity I want yet, but maybe the barrel will speed up a bit more?
The best load of the day was:
34.3gr Varget, Berger 109, and WSR. 2898, SD of 2, and maybe .25 moa at its largest.
I shot 100 rounds of 33.5gr Varget, new Hornady brass, and Winchester primer. Tested the 108 ELD, 112 match burner, and 109 hybrid. The hybrids shoot the best with the Hornady ELDs coming in a close 2nd. I can't get the 112s to shoot better than .75 moa.
I ran 20 rounds over a chrono today for OCW testing. I am not quite getting the velocity I want yet, but maybe the barrel will speed up a bit more?
The best load of the day was:
34.3gr Varget, Berger 109, and WSR. 2898, SD of 2, and maybe .25 moa at its largest.
Speed doesn't seem bad, you may be able to squeeze a little more out but probably not far from roughing up your brass.
At least for me that was the case. I'm running 108s at around 2925-2930 (up maybe 15fps from where it was with previous lot of varget, 34.1gr), had a great node a few tenths of powder higher but it was starting to be a little harder on the brass and not really worth the fps gain IMO.
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Yeah. I'm happy with what I have, but I was expecting a bit more velocity. Primers have a bit of cratering, but that has been present on every round and didn't get any worse at 34.5. The brass itself looks fine.
I've had two friends now who couldn't get the Matchburners to shoot.
One of them was offered a Barnes Sponsorship and given a bunch of them. He made a lot of attempts to get them to shoot and couldn't. He ended up declining the sponsor.
My friend I shoot with a lot bought a bunch because they were cheap. But anything over 3000fps in his Creedmoor and the jackets fail. Thats in a 7.5" twist. He's shooting them at a very pedestrian 2950fps just so they get to tje target. It's his back up rifle, so he's just going to shoot them up and move on.
One of them was offered a Barnes Sponsorship and given a bunch of them. He made a lot of attempts to get them to shoot and couldn't. He ended up declining the sponsor.
My friend I shoot with a lot bought a bunch because they were cheap. But anything over 3000fps in his Creedmoor and the jackets fail. Thats in a 7.5" twist. He's shooting them at a very pedestrian 2950fps just so they get to tje target. It's his back up rifle, so he's just going to shoot them up and move on.
112 Barnes would not shoot in my 6GT. 108ELDs have been great so far but I have a lot 109 Berger’s to test in the next week or two.
Resurrecting an older but, very interesting thread. I am curious what people are seeing for their fired case water capacity and what trim length you are using.
My rifle (Defiant action/Bartlein 26"/MPA chassis) is shooting very well at slower speeds where I can also see my trace much of the time. Another benefit is very low recoil. I am using Varget at 32.2 grains, Sierra 107's (wish I could find Berger 105's) seated 0.065" off the lands and CCi450 primers. Groups have been decent. My new Alpha brass only has 44.5 grains of water and 1x fired jumped up to 45.15. I am having to push the new brass back 0.002 because the chamber is tight at 1.370 and that is the shoulder length of the new Alpha brass. Some rounds were tight on bolt close before I corrected by pushing the shoulders back. I have been using a trim length of 1.719 so that I can get the brass uniform in length. Loaded rounds are 1.901 ogive/2.475 coal.
I shot a few rounds today to confirm zero and to check the point of impact at 500 yards. Some might think 0.065 off is a lot but, after reading the series of articles on Precision Rifle blog about seating depth I am a believer. I am consistently getting less than an inch of vertical at 500 but, have not been able to test out further (max is 500 at the range I belong).
My rifle (Defiant action/Bartlein 26"/MPA chassis) is shooting very well at slower speeds where I can also see my trace much of the time. Another benefit is very low recoil. I am using Varget at 32.2 grains, Sierra 107's (wish I could find Berger 105's) seated 0.065" off the lands and CCi450 primers. Groups have been decent. My new Alpha brass only has 44.5 grains of water and 1x fired jumped up to 45.15. I am having to push the new brass back 0.002 because the chamber is tight at 1.370 and that is the shoulder length of the new Alpha brass. Some rounds were tight on bolt close before I corrected by pushing the shoulders back. I have been using a trim length of 1.719 so that I can get the brass uniform in length. Loaded rounds are 1.901 ogive/2.475 coal.
I shot a few rounds today to confirm zero and to check the point of impact at 500 yards. Some might think 0.065 off is a lot but, after reading the series of articles on Precision Rifle blog about seating depth I am a believer. I am consistently getting less than an inch of vertical at 500 but, have not been able to test out further (max is 500 at the range I belong).
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