Just an FYI. I've actually loaded 21 grains of H110 behind a 125 grain Hornady XTP. Wanted to see if I could get better than 1450 fps from my 4 inch model 620.

First, this was as loud or louder than a 500 Magnum. Also had a muzzle flash that extended halfway down a 50 foot range according to a couple of witnesses.

Second, posts about flame cutting are 100% true. While it didn't do any real harm prior to this excursion the hottest 357 Magnum I had run in my 620 were American Eagle SJSP range Magnums. So I sort of broke the virginity on my top strap with this beast of a load and to this day feel a bit guilty about it.

Final note, out of a 20 inch 1892 this load will hit over 2200 FPS and the bullet will not spin apart into pieces. However with a steel crescent butt plate it is a bit brutal to to shoot. If I ever re-stock that 1892 it's going to get a shotgun style stock.