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Berger online stability calculator and values on the book

one shot ST

Sergeant
Full Member
Minuteman
Nov 12, 2007
969
69
59
Italy
Doing some comparison between results using Berger online stability calculator with the values founded in the book “ Ballistic Performance of rifle bullets “, I’ve found, in a lot of cases, something that doesn’t match, for example using the data for the best, nominal and worst case with the calculator I see a value that is significant different from the value on the book.

example see picture in attach

nominal case is for sea level, 50% humidity, 59 F and 2800 twist 1.8 with the Lapua Scenar L

with this twist I’ve a stability of 1.10…. So not stable

if I put same data on the calculator I’ve a stability of 1.72…. Stable and correct, same value using also other software like FFS, StrelokPro ecc ecc

in the book I can also see discrepancy with minimum and recommended twist..

I’ve all the books of BL and there are a lot of helpful information but I don’t realize if what I’m talking about is one my incorrect procedure or an error in the book
 

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