Hello
Reloading manuals and data sheets always give a maximum OAL length, but what about the Minimum value ??
Maximum and Minimum cartridge case OAL
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All handloading data posted on Full-Bore UK from 23/2/2021 must reference the published pressure tested data it was sourced from, posts without such verification will be removed.
Any existing data without such a reference should be treated as suspect and not used.
Use reloading information posted here at your own risk. This forum (http://www.full-bore.co.uk) is not responsible for any property damage or personal injury as a consequence of using reloading data posted here, the information is individual members findings and observations only. Always verify the load data and be absolutely sure your firearm can handle the load, especially older ones. If in doubt start low and work your way up.
All handloading data posted on Full-Bore UK from 23/2/2021 must reference the published pressure tested data it was sourced from, posts without such verification will be removed.
Any existing data without such a reference should be treated as suspect and not used.
Use reloading information posted here at your own risk. This forum (http://www.full-bore.co.uk) is not responsible for any property damage or personal injury as a consequence of using reloading data posted here, the information is individual members findings and observations only. Always verify the load data and be absolutely sure your firearm can handle the load, especially older ones. If in doubt start low and work your way up.
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Re: Maximum and Minimum cartridge case OAL
They usually give a trim length which I would treat as the minimum. Any less and you are sacrificing grip on the projectile and possibly difficulty in sealing the neck against the chamber during the pressure spike
Chris
Re: Maximum and Minimum cartridge case OAL
Look at the relevant SAAMI or CIP drawing for the cartridge to find the dimensions and tolerances. For example, SAAMI .308 Win shows 2.015" - 0.020", so the minimum is 1.995". The 'trim' length often found in manuals is essentially an arbitrary value somewhere in the middle of the range which gives the best chance of hitting the tolerance window.
Find the SAAMI standards here (e.g. SAAMI Z299.4 for centrefire rifle)
https://saami.org/technical-information ... standards/
CIP drawings are here:
https://bobp.cip-bobp.org/en/tdcc_public
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