40 Smith and Wesson hand load question

[Butcherbill]

I was cleaning up brass after a recent ipsc match and found a few unfired .40s&w hand loads, one of which I compared to a factory 10mm Blazer cartridge. It’s OAL is 20 thou less than my 10mm, has anyone seen or heard of this before? Makes me think someone is loading .40 to 10mm OAL and shooting them out of a 10mm, or am I looking at someone’s hand load for their custom .40s&w pistol? I have yet to pull it apart to weigh the powder charge or compare the bullet to the 180gr Speer 10mm bullets I have.

OAL was 1.252" for factory 10mm blazer and 1.232" on the .40 hand load in question.

.40 hand load vs. factory 10mm

.40 vs .40 hand load.

 

[B]

10mm revolver load I would guess but it could be a lot of things.

 

[Butcherbill]

Could be, I hadn’t though of that. I didn’t see anyone shooting a revolver but that doesn’t mean there wasn’t.

 

[B]

.40 shoots fine from any 10mm pistol I have tried. It can be hard on the extractor but I always got away with it.

 

[Butcherbill]

.40 shoots fine from any 10mm pistol I have tried. It can be hard on the extractor but I always got away with it.

That’s what I was thinking, I ended up with a lot of .40 brass and figured the longer OAL would work as well. Probably a lighter load due to powder volume which should be easier on the brass out of the factory glock barrel, I’ll have to pull it apart and weigh powder etc.

It passed the plunk test in my barrel but I wasn’t about to shoot an unknown hand load.