I'd greatly appreciate it if someone could tell me the neck measurement for a 6mm creed with a 108 grain eldm seated into Peterson brass. Thank you.
Need help please!
- Thread starter crich4254
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Hugnot
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Probably no way to find out without actually measuring.
Neck diameter is (bullet diameter + (neck wall thickness *2)). The neck thickness can be measured with a ball micrometer (ball on one end & flat on the other end).
Neck walls thicknesses may vary from brand to brand- they may vary slightly but necks should be concentric - manufacturing variances.
Look at the cartridge diagram for SAAMI 2299.4 - 2025, page 32. This gives standard dimensions for the 6 CM cartridge.
Using this diagram the 6 mm CM neck measurement is .276. The neck wall is -- (.276 - .243) / 2 = .0165. Neck wall thickness would be .0165. A maximum standard.
Neck diameter is (bullet diameter + (neck wall thickness *2)). The neck thickness can be measured with a ball micrometer (ball on one end & flat on the other end).
Neck walls thicknesses may vary from brand to brand- they may vary slightly but necks should be concentric - manufacturing variances.
Look at the cartridge diagram for SAAMI 2299.4 - 2025, page 32. This gives standard dimensions for the 6 CM cartridge.
Using this diagram the 6 mm CM neck measurement is .276. The neck wall is -- (.276 - .243) / 2 = .0165. Neck wall thickness would be .0165. A maximum standard.
Last edited:
ShtrRdy
Well-Known Member
I thought I was gonna be able to help but I don't have any Petersen brass.
I'd take about any kind right now. I'm just trying not to buy a bunch of $20 bushings I won't need
ShtrRdy
Well-Known Member
I measured the outside neck diameter on some loaded cartridges:
1. Hornady factory match (108 ELD-M) = 0.271"
2. Lapua brass & Berger bullet = 0.272"
3. Norma factory match (107 golden target) = 0.275"
If you want to buy one bushing I'd get a 0.269"
I can't tell ya how much I appreciate that
