Thread: Headspace question on 66-7
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Old 02-06-2022, 07:37 PM
John Patrick John Patrick is offline
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Originally Posted by kennycopter357 View Post
Hi everyone, new member here.

Regarding headspace, I noticed that the cartridge case used, also has an effect on headspace.

I noticed slight pressure marks on the primers when using Sellier&Bellot .357 cases. The pressure marks were not present in other brands of cases (Lapua, Magtech, Winchester). I measured the case rims, and the S&B case rims were a tenth of a mm thicker than the other brands. Load used was a mild 7gr VV N340, 158gr Ares polymer coated bullet. Gun is a four inch model 66, no dash.
With rifles, tight headspace is fine, excessive headspace leads to higher and sometimes dangerous over pressure.

Not sure about revolvers.
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