I have been loading on a 650 for a couple of years and have never double charged a case.
I have produced one squib.
That scares me as much as a double charge.
When it happened, there was no noise other than the click of the hammer falling.
I thought I had a failure to feed so I racked the slide and kept going.
The only thing that saved me was that the bullet didn't travel far enough down the bore to allow another cartridge to chamber.
The gun didn't quite go into battery.
I have a powder check device on the loader that's supposed to alert me when a case has too much or not enough powder.
In spite of this, I found a way to omit the powder in one of the many thousands of rounds I have pumped out of the 650.
Since then, I bought a small inspection mirror with a telescoping handle.
I took a hose clamp and clamped to the back of the 650 frame.
The mirror is round and about the size of a quarter.
It has a swivel built into the handle and I can set it to look down into the case as I'm working.
That way I can visually verify that there is powder in the case as I'm placing the bullet.
I find this especially comforting when using powders like Titegroup.
Without the mirror I can't see the powder at all while loading.
A normal charge doesn't even fill half the case in a .40 or 45.
Nothing is fool proof but this adds another layer of defense against the dreaded zero/double charge.
Tony
Edited by 38superman, 22 May 2008 - 11:40 AM.