JP> After all, when you've got powder in the case, the pressure JP> generated 
by the burning powder tries to force itself out through JP> the primer hole 
and push the primer back.  Seems to me that a JP> primer only case should be 
LESS likely to force the primer back, JP> not MORE likely.  JP> JP> Anyone 
here understand this?
 JW> John, when a normal round is fired, the pressure generated
 JW> is sufficient to push the casehead firmly against the
 JW> revolver frame (or semi-auto bolt face). This does one of
 JW> two things -- reseats the primer or prevents it from
 JW> moving out of the pocket depending on the pressure curve
 JW> of the components in use.
 JW> In the powderless practice rounds, the flash hole is
 JW> enlarged to allow a greater percentage of the primer's
 JW> energy to be applied to the projectile AND to reduce the
 JW> likelihood of primer setback from its discharge.
Gee, you're fast.  I read the original message and in the same package get 
your response.  You are, of course, 100% correct.
 JW> I'll repeat someone else's warning - treat these practice
 JW> rounds with just as much respect as full-tilt loads.  At
 JW> 12-15 feet the plastic variety will completely penetrate a
 JW> sizeable field rat shot through the ribcage.
Good advice.  Those loads aren't for playing with.  Ask the Dragon Lady 
sometime about field rats, wax bullets and M36 S&W's inside a rent house five 
or six miles from town.
Regards.  Cloyce.
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