MCgunner
Member
I have read the 1000 ft-lb number on the internet many times but I have never found a good logical construct behind that number. Do you have a reference for where that number of 1000 ft-lbs comes from? It reads sort of like the old myth going around that you need to drink 8-glasses of water a day. I think its a fine number but its does not seem to have much solid scientific or historic support other than being repeated often. So far I have gone as low as 700 ft-lbs but if I end up using 300 BO sub-sonic it will be even lower (=< 500 ft-lbs).
The 1000 ft lb thing was wisdom in hunting magazines like Outdoor Life back in the 50s and 60s when I was learning about hunting, rifles, and ballistics by reading every publication my uncle had on the subject. Used to LOVE to thumb through his old Gun Digests and read 'em cover to cover. Guys like Jack O'Conner (he may have even come up with it) wrote volumes on this and the merits of the .270 Winchester for game up to and including elk. If you're not as old as me, you probably never read any of this, but it was accepted wisdom, and rightly so, back then. This was an era before controlled expansion bullets and .22s just weren't loaded proper for anything bigger than woodchucks, anyway.
I do think 500 ft lbs is pushing things, myself. Even my .357 magnums out of my 6.5" Blackhawk are making near 800 ft lbs at the muzzle, but at striking range of 50 yards are just over 500 ft lbs. It's a big, flat bullet and doesn't need expansion. I don't have worries about that .357s kill power as I've used it on both hogs and deer at short ranges. But, it's not my go to hunting pistol, that'd be my .30-30 Contender. I have a .45 Colt blackhawk that's very accurate, but I've yet to kill anything with it and have only hunted with it a couple of times. I think big pistol bullets have an advantage at low energy levels over .22 caliber rifle rounds. They blow a big hole, which is a bit more important than energy at these low levels. There's NO PROBLEM following a blood trail left by a flat point Keith style .357 SWC. .22 caliber rifles, not so much. .30 caliber rifles? I don't know, my .30s pack at least 1600 ft lbs (7.63x39) at the muzzle.
I don't have any experience with weak .30 calibers.