I recall a shooter first time progressive reloader using fast powders in a .44 fired from a Smithy 29 8 3/8th stainless. She had run out of powder but kept pumping building a few squib loads until she refilled the hopper and ended up double charging (and compressing) some of the rounds.And" don't forget to watch them heavy loads
At the range we wondered why this hand canon of a gun was just going poop poop until she stuck a double charge up behind the 3 jammed slugs.
The details of what she had done only came out at the inquest we had to attend
On a lighter note, I have some old receivers (de-milled M4's) that I may chuck in the laser to see what happens to them.
The glocks look nice though that's for sure
cheers
Dave