I think there are velocitiy windows certain bullets like to run at, and I do beleive it translates on paper at distance, not necessarily at 100y, this has been observed in my testing. In smaller cases like br variants and even gt, it's less apparent, but once you start getting into case over 60gr capacity, it definitely makes a difference.
Just to make sure I’m tracking with u-
That's correct.
I totally agree, I haven’t shot groups at 100yds for load development other than when I’m shooting a ladder test . Once I find the( flat spot with the velocity I like) I’ll do seating depth test at 500yds. Might not be the correct way to do it but it has worked in my 6GT for 2 different barrels and 3 different bullets and powders.
Nope, start at 32gr Varg and go up. 107smk will shoot well low 2800 and around 2900. 20-30k jump. I use the 107s in my gfs rifle, 32.8gr N150 at 2910 jumping 25k, they're half moa at 500y on paper.
You're rifle will tell you. The alpha ocd brass is pretty tough. It'll likely max around 34.5gr, up near 3k fps. I know the ladies rifle with N150 showed light lift at 34.1gr N150 which was just over 3000fps.
www.hodgdonreloading.com
You have to select rifle then the cartridge. The link just takes you to the data center.
Varget works well with the 6GT. Up until I switched to RL15.5 I used Varget with 109 Hybrids and 109 ELDM’s.
Varget is a great powder for the 6GT, I started at 32.7 and I am working up from there , but I am not worried about fine tuning till after the 100ish rounds. So far I am really enjoying the cartridge. Good luck.
Attached the link below in case you want to check out any different bullets.
Reloading Data Center
If it's virgin brass, sometimes you'll get psi signs as of light bolt lift and ejector marks as the brass is forming to chamber and coming back to the bolt face, these usually go away on second firing. How do your primers look? Are the edges flat, still rounded, is there cratering? I'm running 33.5gr Imr 4166 in virgin ocd brass to break in a handful of barrels right now with 108/107 gr bullets running 2900-2950 depending on freebore, but these are showing no psi signs on any of them but the AI atx, it gives ejector marks, AI uses a pretty stout ejector spring, it did it with virgin 65cm brass as well.
So this looks to me, is typical first firing with alpha ocd brass signs at the case head. The web is so strong on these cases it doesn't expand much first pop causing it to not grip chamber well, this slams the case head back to the bolt face, giving you that ejector cut signature.
Max load is max load in the book, but it should go without saying; you work up to a load to ensure safe pressure. This is reloading 101 stuff.
Alpha says that thier OCD brass does not show pressure like other brass. They recommend, rather than looking for typical pressure signs, to load within book recommendations.
It doesn't matter what they say. I am on my like 5th firing of 800 pieces of Alpha OCD. ALWAYS work up to a load. You don't know how the powder/bullet/chamber/your reloading skills combination will work. Or don't then get laughed at when you blow your shit up or wreck your barrel/bolt.
I had run a ladder on the 108 eldm up to 34.5gr, went back down from 34.5 to 33.5 at about 2850fps. I had brought some of those loads along.
Lots of data posted here on both powders. I prefer the 15.5. All mine run 33.4 to 34 grains. Start low and work up with proper load development.
Sorry I was unclear. The 10.5 lb. limit is for the unloaded rifle with scope. Bipod, suppressor, sling, etc. are not included in the weight limit. Thanks.
Any shooting position is allowed. Most folks shoot from a bench. Scoring is the shooter's last 10 shots. Keeping 10 consecutive shots sub MOA from a light rifle is "challenging ". Great intel in this thread. Much appreciated.
Perhaps try a faster burn rate to get the chamber pressure up a bit at that 2820-2850 range. 4166, varget, TS15.5 all do well. My 115 dtac H4350 load at 2850 has really good spreads at 35.5gr, but I'm sure psi is higher with that bullet.
My match load with 109 ELDM’s is with 33.3 of 15.5
The sierra is a good bullet, I run them in the lady's gt and one my bra's. I also have the 109 eldm, and load them in my brothers 6gt. The 107s like to be 20-30k off, 109s we most consistent back around 55-70k jump range. They both routinely shoot half moa to a bit smaller at distance. I feel the pointed sierra is a lil more consistent within the same lot, but there is base to ogive differences from lot to lot. If you buy em, get enough of same lot to burn the barrel out. I have no experience with the vapor trails. The 107smk trued up at a 281g7 and 109 eldm trued up at 286. Very little difference. The eldm can be used on game but do not recommend putting the pointed 107s on flesh, if that makes a difference in your decision to hunt with the round.
LOL! Thanks!
170fb is better for dtacs yes but guys have ran the 115s in the short fb reamer.
