Between my brother and I we have been reloading and hunting with th glock 20, 29, 40 (7 of them between us) for over 25 years now.
Our experience so far is:
Winchester nickel, starliner, Remington brass all have variations in capacity.
Pick 1 brand of brass, measure and sort by weight (1000 cases)
Pick out 100 or more that are identical +/- 1 grain AFTER trimming to identical length
A 180 grain or 200 grain hard cast homemade bullet properly coated and load to as maximum velocity as you can get a 4" group at 100 yards
7 elk, 3 bear, 12 deer have died quickly with a heart/lung/shoulder shot
Complete penetration broadside of a roosevelt elk, mule deer, whitetail or black tail is EXPECTED with a broadside shot. @ 100 - 125 yards
A texas heart shot on a mature elk will find the bullet under the skin on the far shoulder after traversing a 900lb elk.
This is with a 180 OR 200 grain hard cast coated at 1200-1300fps
More bullet weight is ABSOLUTELY not necessary
Even on a 350lb black bear the bullet will go through BOTH sides of the skull, the ribs, the paunch and EXIT between the rear legs!
180 grains is enough
170 grain factory loaded Winchester Silvertips will go through an elks SHOULDERS HEART LUNGS at 75 yards
leaving a football shaped mess in the lungs heart
The glock 40 with red dot is a fine 125 yard deer elk weapon!
And
3 shots drt
2 shots drt
I would not know what 1 shot is
I ALWAYS double tap a pistol
Nuff said