The Firing Line Forums - View Single Post - mini-30 bore dia. .308 or.311?

Gewehr98 · October 8, 2004, 09:28 PM

The throat in the Mini-30's barrel is purposely tapered, much like the freebore found in Weatherby Magnum rifles. This keeps pressures down, while gradually allowing a .311" bullet to engage the .308" bore diameter further down the barrel without any problems. While it doesn't help the accuracy potential of .308" ammo, it does allow interchangeable usage of either diameter bullets in a utility-grade rifle like the Ruger Mini-30.

October 8, 2004, 09:28 PM	#8
Gewehr98 Senior Member Join Date: June 30, 2000 Location: Token Creek, WI Posts: 4,067	There wasn't really a switch to .311" The throat in the Mini-30's barrel is purposely tapered, much like the freebore found in Weatherby Magnum rifles. This keeps pressures down, while gradually allowing a .311" bullet to engage the .308" bore diameter further down the barrel without any problems. While it doesn't help the accuracy potential of .308" ammo, it does allow interchangeable usage of either diameter bullets in a utility-grade rifle like the Ruger Mini-30. __________________ "Bother", said Pooh, as he chambered another round... Neural Misfires Last edited by Gewehr98; October 8, 2004 at 11:03 PM.