1-7 twist too much ????

[J E Custom]

Grain twist barrel, whats that ?

A gain twist barrel is one that starts out at the breach with a slower twist and as the bullet
accelerates(Moves down the barrel) the twist rate gets faster.

Example breach end twist rate is 1 in 10. Muzzle end twist rate 1 in 8. I am not sure what the extreme limits of difference is but the ones that I have seen have been 2 to 4'' different from
one end to the other.

These gain twist barrels were for 4200 ft/sec + velocities and used where normal bullets would
not hold up to starting inertia.

I have a .22 WSSM with a 1 in 15 that shoots great at 4400+ft/sec without bullet damage. I still don't no how fast I can push a bullet in it before it starts to destroy them.(I reached 4500 ft/sec
and it did not shoot any better or worse so I settled for anything under 4500 ft/sec. this rifle would have been a good candidate for a gain twist barrel but I decided to go with the 1 in 15 instead.

J E CUSTOM

 

[Skidro]

I have a 243 Brux 7.5 Twist. I shoot 105 Berger 2985 FPS with H1000. I am pleased with mine.

 

[Freedom2live]

Skidro

how deep do you seat them
and what groups you get so far

 

[Skidro]

Skidro

how deep do you seat them
and what groups you get so far

COAL-2.810
1/2 MOA 3 Shot groups out to 500 yards

 

[Mikecr]

My gunsmith at hart barrel says its optimum twist because my 243 aint shootin past 3000fps

Your gunsmith is wrong.
105VLDs are not reliable in 7tw at 3kfps, and their optimum stability is in 8tw -where they are also completely reliable.