Fred_Dwyer
40 Cal.
- Joined
- Apr 5, 2011
- Messages
- 245
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There is no doubting that a lead ball will obturate if given sufficient acceleration.
How much is the question. So I picked some numbers out of the air to see; I tried to error on the moderate side of forces. Take a 170 grain round ball through a 42" barrel reaching 1700 fps in 0.002 second (That's probably too long) there's approximately 28000 G forces of acceleration. That figures to about 630 lbs of push on that ball, I wonder if that is enough to smoosh it a bit? If that ball launches in 1 millisecond you can double that number; 1260 lbs on the ball would be approximate 6400 psi of chamber pressure. Sounds about right. The ball is deformed a bit.