Western Juniper,
Its one thing to hypothetically think out loud, it's another to actually go out there and see for yourself.
PA,
The 180 swift A-frame is a lethal, deep penetrating bullet at 1000 fps or 1200 fps it will even slightly expand at 900 fps thats pure copper and pure lead for yah. Lil gun or 2400 powder. Caught a 55 inch racked bull moose off the nation river last week.
Put a 41 caliber, 350 grain A-frame bullet square through his front end, fired from my lever gun. He was instantly downed. Canoed across to start breaking down the brute about 15 minutes later. He came to, eyes bugging out of his head, snorting and growling. Out came the trail pistol with 180 grain swifts. A finish shot square through the big neck. Skinning the big bull, that dmn bullet penetrated 16-18 inches of moose neck after punching through that half inch thick hide. Shock from controlled expansion, and deep penetration. It's a good combo. I'm not a hard cast fan, these a-frames kill quicker. Here's that swift pistol bullet recovered from the off side, a mature, bull moose neck is as tough as it gets: