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Old October 16, 2018, 02:21 PM   #6
T. O'Heir
Senior Member
 
Join Date: February 13, 2002
Location: Canada
Posts: 12,453
The twist is about the bullet weight. Not the propellant. 1 in 18 is apparently common for the .38-55 though. Who told you it wasn't?
Mind you, the BP cartridge guys argue about twists too.
http://www.bpcr.net/forum/viewtopic.php?t=2369
https://www.assra.com/cgi-bin/yabb/Y...num=1202346186
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