Bolt Shims

[Grimmy]

Me and another member of our gun club have a CZ Varmint MTR .22 cal.
He installed bolt shims in his and hopes it will improved the guns accuracy.

Are bolt shims really necessary in a MTR since it has a match grade action to begin with?

 

[Bwana John]

Depends on the rim thickness of the ammunition you are using, and the rifles original headspace.

A “correctly“ headspace gun might not need a shim for “average” ammunition rim thickness, be loosely headspaced for thin rims, and gall the shims with thick rimmed ammo.