Re: 40 S&W in 10mm Auto??
They run fine in mine. I did it as a test to see what would happen if there was an absolute ammo shortage and I absolutely needed to shoot SOMETHING from my 10mm G20
The accuracy at 25y was about a foot sized group from a gun that normally runs 2.25-2.5" for me. Certainly enough to hit an assailant, not enough that I am comfortable using it.
The case, as correctly stated above, is held in place by the extractor. They will not single feed, they must feed from the magazine. This practice is very hard on the extractor and will sometimes cause it to fail/break. Not necessarily during the firing of 40's either, several people I've heard of doing this have had it fail after another box of 10's was shot through it.
After 100 rounds or so I switched back to 10mms and saw no major changes in accuracy, POI, etc.
Lone Wolf has my 6" conversion barrel for them right now, I had some accuracy and FTF issues with it, their armorer has been very forthright in trying to fix it and work with me. If we can't figure out what's going on he said he'll just replace it. Be forewarned that he said they use pretty tight chambers on their barrels, and yes, they are fully supported. This is probably why I'm having some feeding issues, all the reloads and factory ammo I put through it were flat points.
LWD had no issues when I told Dan (armorer) that I was planning to shoot a lot of reloads, he even said to send him some ammo and he'll tailor my chamber to my reloads if I want.
The issue I did find with some 40 loads is that the light target WWB ammo won't generally run with the 21lb recoil spring I put in it. The stock spring (16 or 17# I think) runs just dandy.
