Aguila Blanca
Staff
And none of the manuals will have all the bullets available on the market. That's why some of the folks on the M1911.org forum started collecting data on bullets. One of their members put it all into a spreadsheet that he posted on Google Docs as a reference for this exact purpose -- to allow people trying to work up loads using bullets that have no published data to compare those bullets to bullets with known data and get a better estimate on seating depth ... and, indirectly, anticipated pressure.HiBC said:For pressure,its the depth of the bullet base that determines combustion chamber volume. That will vary,bullet to bullet.
Thats why its good to look at Hornady data for that particular bullet.
https://docs.google.com/spreadsheet...uItM0glf7wjhd8/edit?hl=en&hl=en#gid=519572970
Even within bullets of the same weight, it was surprising to me to see how much variation there is on bullet length, and in bullet body length. It made me even less inclined to pay attention to Berry's advice that you can use data for any bullet of the same weight (which gets Berry's off the hook with respect to generating load data for their bullets). I never liked that, and I found that loading their bullets using data for other projectiles always resulted in considerably less velocity than expected. Once I saw how short their 230-grain round nose bullet is compared to others, I understood why.
If you can find your bullet in that list, you can use the data to figure your seating depth, and that's what you need to know.