Anybody using the swift 350 or 400 grain a-frames for moose or big bears.Which would be the better choice the 400's at 2100fps or the 350's at 2200 fps.

On what platform?

Jackfish not sure what you mean?

What rifle are you shooting?

I shoot the 400g out of a 458 at around 2150, and it works great. Not sure how you would get 2100 out of a lever action, even if you've got a 450 alaskan, and I doubt you could get it with that. The bullet is longer than most other 400 grainers and would either be seated too deep or the cartridge would be too long. Do you have a load now thats getting this velocity? What's your cartridge?

I think they came out with the 350s just for leverguns and will probably work much better. I think they're too new to find much data on them though

Sorry your post said 45-70, missed that. I think you'll be better off with the 350g. I think you'd really be pushing your luck trying to get 2100 fps with that bullet in a 45-70 levergun.

Jackfish , i mean to say 2000 FPS it would be a marlin 1895 with 20"-22" i am currently getting 1900 FPS with buffalo bores 430 hard cast out of a 22" handi rifle ( they advertise it at 1925) so i figured i could get 2000 out of the 400 A-frame

One thing thats possible is to open up the marlin action to cycle longer overall length cartridges. That way you could seat the bullet out a little further giving more powder space. Was it Wild West guns that made a similar modification? That way you could crimp in the rear groove (A frames 400g come with two grooves these days). You might be able to get your 2000 fps, but I think it'll still be pretty hot.

Why not stick with buffalo bores? Actually the 350 A frame still might be your answer, it was designed just for this purpose. I've been thinking of trying them in my marlin too, A frames are great bullets.

You may be right dean maybe i'll try the 400's in the single shot

I think you would be better off trying the North Fork 350 grain FP at around 2100 fps. JMHO

also remember that cast bullets produce less pressure at the same velocity as jacketed bullets.
Also realize barnes x bullets are solid copper and produce slightly higher pressure than regular jacketed bullets
in a lever action I'ld go with the lightest possible x-bullet. in a single shot made for higher prssures, maybe?