Bolt shim question

[Topwater]

Have any of you, who have used bolt shims for a CZ 457 bolt, used any lubricant ? I am considering coating the shims with a sparse bit of HBN to reduce future warping of the shims. Any thoughts or ideas ? Thanks.

 

[HGC]

The shims definitely take a beating, I use Hornady one shot lube and cleaner for the bolt after each range session.

 

[tmwinds]

Just curious, what did the head space measure before shimming and did you see accuracy improvement?

 

[mrh1958]

I would not shim the bolt, if the head space is in spec you wont see any improvement.

 

[Topwater]

I’m still waiting for the shims to arrive. I have two friends that have used the shims. Both claim a minor increase in accuracy for “ some “ Ammo.

 

[Lumpy’s guns]

I have a shim question, when is headspace to tight? I put in a.008 shim the bolt closes hard but accuracy is really good. I also had a bunch of misfires, not sure if related.
CZ 457 MTR

 

[stacy]

I have a shim question, when is headspace to tight? I put in a.008 shim the bolt closes hard but accuracy is really good. I also had a bunch of misfires, not sure if related.
CZ 457 MTR

Yes to tight of headspace will cause misfires

 

[Lumpy’s guns]

Thanks I will back it off a little