I stopped at T+T Bullets yesterday, and picked up a box of Barnes 400 gr. XFB bullets. They are a solid copper hollow point spitzer style bullet, not meant for a tube magazine. The bullet is 1.3" long, with a hollow point 1/2" deep that's meant to peel back to form petals, and retain 100% of it's weight. I loaded a few tonight, and had to play with the COL to get them to fit the chamber of the BC. They ended up at 2.93" COL. I used Varget powder because of it's low pressure in the 400 gr. loads, 55.0 gr. C max. load at 25,000 CUP, and 50.0 gr. min. load at 18,600 CUP. I hope to try them tomorrow to check for pressure signs, and if that goes well, I'll work on loading some for accuracy. I imagine they were engineered for the 458 Win. Mag., but with only about 250 FPS difference between the 45/70 and the 458 Win Mag. in the 400 gr. load, they should work. They should make one heck of a hunting round.
Don