I would agree, internal volume is going to have an impact. As an example, a #2156 built to 2.900" with a given load of TR140 behind it through a 30" barrel:
Case capacity 55 grains water gives 2966fps
Case capacity 56 grains water (Default) gives 2942fps
Case capacity 5y grains water gives 2919 fps
PPU Brass vs Lapua brass
Moderator: dromia
Forum rules
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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Mr_Logic
Re: PPU Brass vs Lapua brass
I have shot both at long range. With the right sorting and prep, PPU is OK. However, Lapua is more consistent and stronger, so it is a much better choice.
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