Originally Posted by tikkat3270wsm
J E Custom, i will be running 165 and 175 gr Matrix out of a .270wsm on a Tikka T3 action, custom stock
I have and like the three grove barrels so I'm not knocking them. they do seem to extend barrel life
because of the wider lands and lead. the down side is that they are harder on bullet jackets because they have to upset (Displace)more bullet jacket to engrave it . They seem to be at there best at high velocities (4400+) slow twist rates 1 in 15 and with light bullets to prevent shearing the jacket off the bullet. Jacket shearing is common on large heavy bullets if a fast twist is used (Bid bores,40
caliber and larger normally use a 1 in 14 twist 8 grove barrel.
Everyone has an opinion on this and mine is "Different cartridge/bullet combinations have different needs. So there is no one best twist/grove combination.
If it were mine, on the .270 WSM with heavy bullets, I would chose a 6 grove 1 in 8 to 1 in 9 twist.
For all round performance.
Just My opinion
J E CUSTOM