Measuring Base-to-Ogive and Base-to-Datum for Sizing
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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.
Re: Measuring Base-to-Ogive and Base-to-Datum for Sizing
Interesting results, what is the rifle and is it a standard or custom build?
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WelshShooter
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Re: Measuring Base-to-Ogive and Base-to-Datum for Sizing
It's a Remington 700 with a border barrel. It was made by Dave at Valkyrie firearms. For what it's worth it has a small amount of freebore as it was reamed for 123gr projectiles.
Re: Measuring Base-to-Ogive and Base-to-Datum for Sizing
Doing a little statistics on your velocity data (unpaired T test), the three Hornady loads are not significantly different, but the Lapua pair are.
http://www.graphpad.com/quickcalcs/ttest2/
Triffid
http://www.graphpad.com/quickcalcs/ttest2/
Triffid
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WelshShooter
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Re: Measuring Base-to-Ogive and Base-to-Datum for Sizing
Thanks Triffid, did you check my data for normality first 
If non-Roman then it makes sense to compare the non-parametric medians via the Mann Whitney test.
Nerds stuff aside, it's a surprise to me that the velocities aren't different. Would it be too much of an assumption to assume that there's no nett change in pressure? I have no way to measure this without directly involving the velocity so wondered what people's thoughts are.
If non-Roman then it makes sense to compare the non-parametric medians via the Mann Whitney test.
Nerds stuff aside, it's a surprise to me that the velocities aren't different. Would it be too much of an assumption to assume that there's no nett change in pressure? I have no way to measure this without directly involving the velocity so wondered what people's thoughts are.
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