Hobie wrote:People can and do kill deer with a given load from a 4" revolver that they would not use from a 20" barreled rifle. That amazes me . . . What it comes down to is what gives you confidence.
Yep. The 150 yard velocity and energy from a rifle may be better than the 75 yard velocity and energy from a handgun, and nearly all of us are way better at shot placement from the shoulder gun.
The same topic comes up with the .32-20, and here's some interesting comparison . . .
I chronographed a .357 factory load 180 gran (Speer I think) a couple years ago, just to see what it did out of 18" Marlin. I got 1395 fps which is just shy of 800 fpe. RCBS ballistic software projects that out 1200/600, 1175/550 ,1100/475 ,1060/450, and 1030/425 fps/fpe at 75, 100, 150, 175, and 200 yards.
To be "on" at 150 yards, I'd be 7" high at 75 yd, 6" high at 100 yd, 7" low at 175 yd, and 12" low at 200 yd. The reason I included out to 200 yards is that I know some of the deer I might THINK are 150 yards away might be more than that. (Which is why personally I'd not use my .357 past 75 yards.)
Look at a .32-20 load for comparison: I got 2095 fps from 16.3 gr of 296, which is about 1075 fpe. Velocities and energies and trajectories vs. the above are: 1700/620, 1600/550, 1400/430, 1300/380, 1250/340 at 75, 100, 150, 175, & 200 yd., with 2.5" high at 75 yd, 3" high at 100 yd, "on" at 150 yd, 3" low at 175 yd, and only 7" low at 200 yd.
Now the old timers got plenty of deer with the .32-20, and we discussed the differences in hunting style over the years on the other thread, but if you look at just the energies, the .32-20 and .357 aren't that much different in energy at 150 yards, but the .357 'keeps' the energy better farther out with the heavier bullet. OTOH, you have to HIT the deer, and if you look at the trajectory of the .32-20, and consider the potential error in ranging, I'd rather try to hit that deer out at "140 to 170 yards" with a .32-20.
Now, if you want to drive yourself even crazier, consider the fact that "energy" measured as a physicist would, in terms of mass times velocity squared, may equate to potential tissue displacement, but likely does NOT equate to lethality very directly.
IMHO velocity isn't important so much as the imparter of energy, as it is to assure accurate shot placement because you don't have as much drop if you misjudge distance. Especially at sub-sonic velocities, all you're really doing is making a hole, as Hobie said, and WHERE that hole is is the most important thing, with the DIAMETER also important. If the hole goes clear through, all the better - more hemmorhage.
Still, all this pontificating and ballistics is for bad-weather-days; if you just go out and shoot any gun often enough and well enough to HIT whatever you aim at, then you surely can put down a deer at whatever range you are good with that gun, as long as there's enough 'punch' left that your bullet would penetrate a shoulder if it hit there by mistake.
Personally, I'm not confident enough in my .357 skills to shoot a deer past 75 yards, and if the .32-20 were legal here I'd not likely use it much beyond that range, but that is only because I have the options of .44 Mag, .45 Colt, and .454 Casull, which all make big holes, and shoot a reasonably flat trajectory out to 200 yards if you use the right bullet. For any of those I'd be confident to 150 yards, and beyond that I'd want a pointy-bullet gun or a .444 Marlin. Still, the 'old-timers' were not so lucky as to have so many gun choices, and they just used the tools they had. My great grandpa evidently did just fine with his .32-20, although I don't know the ranges used.