The Firing Line Forums - View Single Post - 300 win mag barrel swap, whats minimum headspace

rammerjammer · January 13, 2014, 01:12 PM

New to the forum so Hello to all.

Just swapped the barrel on my 7 mag to 300 win mag on a Savage 110. I know case life is better with a tight Chamber, that being said I want to set my head space LESS than the .220 go gauge. I have several brands of brass none of which the belt to case head is thicker than .215 , so I don't want my headspace being say .224 which is between the go and the .227 no go. I made some beer can shims that are .0025 and set my headspace to the brass plus one shim as a go , and 2 shims as a no go. So if actual headspace is .218 would that be a problem? Im really just trying to eliminate so much unsupported case in front of the belt.

I know the possibility exits that some store bought ammo might not chamber ( i doubt it )but I will probably never shoot anything but hand loads. And I dont hunt dangerous game .this is mostly a target and deer rifle. Thanks, Mark

January 13, 2014, 01:12 PM	#1
rammerjammer Junior Member Join Date: January 12, 2014 Location: Dothan, Alabama Posts: 5	300 win mag barrel swap, whats minimum headspace New to the forum so Hello to all. Just swapped the barrel on my 7 mag to 300 win mag on a Savage 110. I know case life is better with a tight Chamber, that being said I want to set my head space LESS than the .220 go gauge. I have several brands of brass none of which the belt to case head is thicker than .215 , so I don't want my headspace being say .224 which is between the go and the .227 no go. I made some beer can shims that are .0025 and set my headspace to the brass plus one shim as a go , and 2 shims as a no go. So if actual headspace is .218 would that be a problem? Im really just trying to eliminate so much unsupported case in front of the belt. I know the possibility exits that some store bought ammo might not chamber ( i doubt it )but I will probably never shoot anything but hand loads. And I dont hunt dangerous game .this is mostly a target and deer rifle. Thanks, Mark