I Didn't Know This, .40 S&W through 10mm G20

[SuperiorDG]

[BPTactical]

Gee, what could go wrong???

Please people do not try this at home.

[gos]

It's cute he thinks those gloves would protect his hands from a catastrophic failure.

[Hoser]

Get a K&M 40 barrel for a G-20 and it is fine.

[cofi]

Gee, what could go wrong???

Please people do not try this at home.

Burt what could happen?

[Bailey Guns]

I'm no gunsmith... But I would think the only thing holding that fotay round in the firing position would be the extractor since it isn't headspacing properly in the chamber. I'd be concerned about an unsupported case rupturing.

[BPTactical]

Burt what could happen?

Oh, other than a catastrophic barrel failure not much

You are going to have the difference between the end of the 40 case and the end of the 10mm chamber that will foul and lead up. Worst case it will shave some of the 40 projectile on the crisp edge which is the end of the 10mm chamber. Do it enough or that one round that is "just right" and it can cause a pressure spike which is on the list of bad things.
Not to mention the erosion on the 10mm throat.
Where the worst potential for an issue is when NumbNut loads a 10mm unwittingly and pulls the trigger. Now that round is crowded into the chamber along with all of the fouling etc.
Pressure spike.

Again, only a stupid ass would do such.
We aren't stupid asses here.

And Bailey is spot on, it would be very hard on the extractor.

[rbeau30]

Looks like from his channel he tries this with other calibers and does other stupid things with firearms? Won't be long and Murphy will come visit him. More air for me.

[davsel]

I would have thought the 10mm recoil spring would be too stiff to cycle a .40.

Next, I want to see .357 Sig in a .40.
Then, a .380 in a 9mm.

He won't last long.

[ray1970]

The thing ejected better than my factory Glock 17. I'm jealous.