One of the downsides of the 10mm for a trail-gun or woods/predator defense gun is that there is no commercial offering for snake/shotshell loads.

IMO, the 454 5″ Ruger Super Redhawk is hands down THE BEST Predator Defense gun. Both for large predators & venomous snakes (45 colt snake shot is amazing!).
But, one downside to the 454 is size & weight and difficulty concealing. For that reason, I have a 10mm semi-auto when I need to go into the woods; concealed. I’m very hopeful for the XDM 10mm coming out in 2017!  But until then, I have to “hold my nose” and use a Glock 20.

My Glock 20 has a 10mm, 40 SW & 9×25 barrel. So, I was thinking of an experiment of trying  40 SW snakeshot in a 10MM barrel.

THE RESULTS of 40 SW in a 10mm Barrel.

Patterns good at 8′, but may not be effective on a venomous snake at 10′.
The TWO shotshells I tested; BOTH failed to eject (FTE).
My impression is, the “casing” over expanded in the 10mm chamber, and thus failed to eject(gun closed on an empty casing, so it was NOT a brass high malfunction (type2)).  The gun cycled enough to reset the trigger. I could tap-slap-my-shoulder and resolve the malfunction (Type 1).

Here are photos of the casings & pattern.
The author aimed at the square cut-out at 10′.
The author aimed at the orange circle at 8′.

CCI 40 SW snakeshot in a 10mm barrel @ 8' and 10'

CCI 40 SW snakeshot in a 10mm barrel @ 8′ and 10′

casings after firing 40 SW snakeshot out of a 10mm barrel.

casings after firing 40 SW snakeshot out of a 10mm barrel.

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