07-09-2011, 06:05 PM
I think those velocities might be optimistic assuming safe pressures. The 6mm SPC (http://ammoguide.com/?catid=631) -- which will be very close to the 6 mm DTI -- shows only 2900 ft/sec with 75 grain bullets using a 20-inch barrel.
Even stretching the barrel to 24" won't likely get the added velocity with the 15 grain (20%) heavier bullet.
Even stretching the barrel to 24" won't likely get the added velocity with the 15 grain (20%) heavier bullet.
