02-09-2017, 03:43 PM
Wonder what the velocity gain would be with an ackley improved grendel
My 6mm turbo 40 has a blown out shoulder of 40 degrees and a much shorter neck than the original grendel case
Suprised someone hasn't already done it
My 6mm turbo 40 has a blown out shoulder of 40 degrees and a much shorter neck than the original grendel case
Suprised someone hasn't already done it

