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Range Report 6GT Project/Range Report
- Thread starter NorCal Vu
- Start date
I'm at 1700 rounds and noticed my groups opened up. I listened to the modern day sniper with scott satterlee and was at .02 off the lands before this test. I shot 5 round groups left to right and than bottom left to right. Point of aim was the corners of the box and the bullet meet my lands at 1.980. Below is what I seated the bullets to,
1.975
1.970
1.960
1.950
1.930
1.900
1.880
1.860
1.975
1.970
1.960
1.950
1.930
1.900
1.880
1.860
Attachments
My velocity stayed the same in the beginning as it did at 1500ish rounds, 2880ish. When I opened my new 8lb of varget, at around 1600 rounds I did another velocity test and I was at 2926 with the same amount of powder. The change was definitely due to the different lot of varget.
Agreed. I was hoping this would be a unicorn. But physics is physics. Want longer barrel life than dasher, looks like 6br is still gonna be king.
Unfortunately not all that surprising. Even though many seem to be claiming 2000+ on their barrels.
For shits and giggles, if possible let it soak filled with CLR and/or boretech. Clean it to the steel as close to new as possible (won’t take long after soaking).
Borescope and see what the throat/fire cracking looks like. Or if it tightens back up.
I’ve been seeing 2500 claims. If this and more barrels go at 1700. Average will be in the 2k area. Basically same as everything else.
I’ve yet to see anyone post any real data showing the difference. Lots of speculation.
Someone get the precision rifle blog on it!!
I can't comment on burn temp or throat wear, just that H4350 is slower burning and is lower pressure than Varget when at the same velocity for 6GT (per Hodgdon data). But it's also burning more powder to achieve the same velocity as Varget.
What was GAP's claim for barrel life on the 6GT? Was it as ridiculous as their barrel life claim for 6.5 SAUM?
I believe it was in the 2500 area. But I might be misremembering. I know it was advertised as better than dasher which is 2k generally.
I don’t know why we (myself included) keep believing gap barrel life claims. None of my 6cm ever made it above 1500/1700 or so and when they made it that high it was rare.
GAP seems to have a propensity to exaggerate barrel life numbers.
Based on their past history I'm always skeptical of their barrel life claims, and not surprised when they are never met.
I think the 6GT has some neat benefits to it, and I can see it being a pretty compelling cartridge for people to jump in to. Hopefully people aren't disappointed when they learn what the more realistic barrel life numbers are.
No, I likely won’t be. I’ve had issues with alpha 6gt and alpha dasher brass.
With assumed barrel life the same as 6dasher and less than 6br, I have never had enough feeding issues to give up lapua brass for hornady (even though hornady 6gt brass seems to do well).
I’ll probably just run my 6gt barrels as practice barrels. When it gets close to dying, run at club matches and leave the hornady brass on ground.
Every cartridge has its compromises. You just need to find the one(s) that achieves what you desire, and willing to work with whatever compromises comes with that.
Everyone is going to have a different answer to this question, and ultimately it's going to come down to what works for YOU. There's no one wonder cartridge that is going to be the best for everyone.
With that said, I'm curious to hear the responses to your question and how the early adopters also feel about the cartridge. I think it has some neat benefits, but not enough for me to make the jump from 6BRA. I will be curious to see what the popularity of 6GT ends up being, I figured that it would explode in popularity.
this right here ^^^ ive shot a few 6mms and i love the BRA....im at 1100+ a few rounds now and still running 2975 with the same load....im going to run this one in the ground and see where it ends up.
I use .104" freebore. .272" neck (no neck turn).
If using H4895, most people end up in the 30.2-30.8 grains. I'm using 30.3 grains with 105 hybrids and get 2950-2970 fps, with low ES and SD (28" Krieger barrel). My barrel seems to be on the faster side.
Fire-forming load is 29.5 grains H4895, 105 hybrids. Lapua brass and BR4 primers.
.274 neck .104 freebore...
26" 7.5T bartlein
31.3g varget
fed205M
105 hybrid
peterson brass
2975FPS
a 109 runs 2945 and shoots just as well with that same load.
Debating how much I want lapua brass for 6gt.....
Left is hornady. Right is 6x47 lapua run in a 6gt without a bushing
Left is hornady. Right is 6x47 lapua run in a 6gt without a bushing
This thread has been majorly hijacked anyway, lol.
All anecdotal. Everything has compromises.
308, great barrel life, what, like 5000 rounds pushing velocity so wind doesn't get yuh so bad, but recoil is up there??
7-08, bullets with great BC, slower speeds, what like 4000 rounds barrel life, and same recoil as 308??
260, 6.5Creed, 6.4x47L, bullets with great BC, good speeds, 2500 rounds or so barrel life, moderate recoil but not too bad.
Lower recoil for all the 6's...
Hot 6's, by 1500 or so rounds you better have another barrel ready cause time is short.
6GT, by the looks of things 1800???
6mm Dasher, yeah seems like people are watching out by 2000 rounds.
6mmBR, seems like 2500 to 3500 rounds barrel life??? Maybe a tad less for 6mmBRA, and I'm considering it for my next barrel.
223AI, with heavies might be a consideration, especially for inside 600Y, might get 3500-4000 barrel life?? The problem is the fireforming and seeing where you missed. A light load, 24.6gr Varget, with 88's/.545BC, in mine went 2814 fps. Pretty sweet except for bullets blowing up, lol.
Then the problem with light loads is loss in performance and barrel life doesn't seem to be extended much more.
One could use powders with low flame temps to extend barrel life but the downside is they are usually temp sensitive.
It does seem like the 2900 to 2950 fps area there is a sweet spot with 6mm 105's??? Though the best success I had was with 115 DTACS at 2925 - 2950 fps. Even though my 6mmBR is more accurate, has lower ES, has lower recoil, etc, it's harder to hit steel past about 600Y in the wind "in real life" to me??!!
If all matches were off the bipod only, and distances were commonly past 600Y, big 7mm's and 30's would have a resurgence because .8-ish BC and speed.
Well all I can say is I'm glad for cheap prefit barrels!
I'm bored so you've suffered the consequences.
All anecdotal. Everything has compromises.
308, great barrel life, what, like 5000 rounds pushing velocity so wind doesn't get yuh so bad, but recoil is up there??
7-08, bullets with great BC, slower speeds, what like 4000 rounds barrel life, and same recoil as 308??
260, 6.5Creed, 6.4x47L, bullets with great BC, good speeds, 2500 rounds or so barrel life, moderate recoil but not too bad.
Lower recoil for all the 6's...
Hot 6's, by 1500 or so rounds you better have another barrel ready cause time is short.
6GT, by the looks of things 1800???
6mm Dasher, yeah seems like people are watching out by 2000 rounds.
6mmBR, seems like 2500 to 3500 rounds barrel life??? Maybe a tad less for 6mmBRA, and I'm considering it for my next barrel.
223AI, with heavies might be a consideration, especially for inside 600Y, might get 3500-4000 barrel life?? The problem is the fireforming and seeing where you missed. A light load, 24.6gr Varget, with 88's/.545BC, in mine went 2814 fps. Pretty sweet except for bullets blowing up, lol.
Then the problem with light loads is loss in performance and barrel life doesn't seem to be extended much more.
One could use powders with low flame temps to extend barrel life but the downside is they are usually temp sensitive.
It does seem like the 2900 to 2950 fps area there is a sweet spot with 6mm 105's??? Though the best success I had was with 115 DTACS at 2925 - 2950 fps. Even though my 6mmBR is more accurate, has lower ES, has lower recoil, etc, it's harder to hit steel past about 600Y in the wind "in real life" to me??!!
If all matches were off the bipod only, and distances were commonly past 600Y, big 7mm's and 30's would have a resurgence because .8-ish BC and speed.
Well all I can say is I'm glad for cheap prefit barrels!
I'm bored so you've suffered the consequences.
if your going to go through all that trouble I’d seriously suggest you do it with Peterson brass
Ah ha! Good one.
There's that 6mm comp match that is supposed to get good barrel life for a 6mm with H-1000???
Don't know about the barrel life on this one but the guy claims 4650 fps for 20/35SMc which is a 6mmBR necked down and with a special shoulder that's supposed to make the case be super efficient. https://en.wikipedia.org/wiki/5_mm/35_SMc
I don’t buy it...I can shoot 5000 rounds outta any cartridge the question is when is it no longer accurate/consistent and then we open the next door of what is your accuracy expectations.
Hey I did get 3000 out of my Nitrided 6x47L barrel and it was a good barrel too.
Extra $120 bucks with shipping, etc, to have it done.
Problem is if the process goes wrong, or something else, there's nothing that can be done since the surface is so hard. So you have a expensive tomato stake at that point. I had mine done before I read all the negative posts here on the Hide and didn't want to take a chance come the next barrel.
Somewhere in between I bought a used 6mm Gendel based barrel that had been Nitrided and it sucked so the barrel sits in the corner since I don't grow tomatoes.
That 20SMC is one I always wanted to try for varminting but didn't. Same with 6compM for steel.
IIRC you went to 6SLR and then to 6mmCreed right? Now 6GT. Favorite?
Decided to try some different primers and powder out of my GT since the FGM205s and Varget were showing pressure at low charge weights and slow speeds (34.1 at 2880). Loaded up 10 each of the 109s and 105s with CCI 450s and H4350 at 0.050" off starting at 35.2 and ending at 37.0. Also loaded up 10 each of the 109s and 105s with CCI 450s and Varget at 0.050" off, starting at 33.2 and ending at 35.0.
I didn't see anything in here. Has anyone loaded up H4350 and 110 SMK that would like to share?
