I know some custom barrels have been made by others (not Robarms) and was wondering if anyone had bothered to do it with a 1/7 or 1/8 tube and if there was any accuracy improvement with 75 gr. or heavier bullets? (EC, I know your take on the subject, LOL)
I have a custom 1-8" twist barrel that I got second or third hand. Honestly, I haven't tried anything heavier than 62 grains in it. Also haven't noticed it to be more accurate than my old 1-9" twist pencil barrel.
I have a 14.5in 1/7 barrel and I really like it. I got it directly from RobArm a couple months back and I'm still working on developing a load for it using 75gr BTHP projectiles.
I have a heavy 1/7 16" robarm barrel. I bought it to play with heavier ammo, 75-77gr and honestly the accuracy is about the same as what was getting with 55gr in my 18.6" 1/9 barrel. Around 1.5" is the norm with my rifle, 3 shots. I usually get two shots that overlap then the third will open the group up. The best 5 shot group I ever got was 1.25" but I have a hard time duplicating that. The rifle I have is a consistent 1.5" shooter with either barrel.
I bought a Robarm 1/7 heavy that is out getting fluted @ ADCO as I type this. I found that accuracy at 100 yrds was similar to my 1/9 lw. But when you let it stretch its legs a little it starts to show up better. At Lee-Kay at the 300 yard berm I actually shot a 5.25" 5 shot with the 1/7 and that's using a Millet DMS-1 on 4x. I have an Accuracy Speaks AR that easily does half that but ....... That's with a Nikon 6.5x24x50 Using the same 77gr mk262 duplicate load I came up with.
Virtually all the 18.5" barrels go into rifle built for Canada. There are a few in the states.
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