Loyalist Dave
Member
Please grade how effective 10mm is in deer hunting from 1-10. 1 being impossible, and 10 being just as or better than the average deer hunting cartridge.
The unknown parts of your question are what optic and what bullet and its speed... plus how far will you shoot...
So if you're loading say a 180 grain Hornady XTP and it's going 1200 fps from your muzzle, and you couple that with a 50 yard zero on your optic.., on paper that round would be an 8+ from a handgun out to 60 yards
Elevation and drop would be + or - about 1" out to 60 yards, and at 60 yards that bullet will still be just about to go tran-sonic..., at elevations it would be going a tad faster. So it should do very well. (This assumes no difficulties with accuracy, perhaps firing from a supported position.)
Depending on the handgun you might be looking at an after-market barrel to get that 1200 fps with a 180 grain XTP, but that's not too difficult to do.
LD