The 380 grain Lehigh Copper Flat Point was originally for my 45-70’s. It got my attention in Buffalo Bore’s factory loads. They are advertised at 2075 fps. Velocity only equaled by price. I bought a couple of boxes of the factory loads. Then ordered the bullets. WAG going by looks, it looks like it should penetrate well and cause a good trail of destruction along the way.
I am eventually going to load some in the 458.
2300 fps should not be out of reason, maybe more.
I am hoping for no issues with feeding in the bolt rifles.

I am not familiar with the Potterfield short stories. I assume a collection of his gun tips ?