you might want to think about a Bore Rider/Duo Diameter bullet's it lets you load super heavy weighted bullet's into
your rifle the front 1/4 of the bullet's riders on/in the bore .

this way you can load up 650 grain and 750 grain bullet's in a plain old 45/70.

And if you add to the a hollow cavitied bullet in the duo diameter it will also alow for a mushrooming effect at slower speeds in a super heavy weight bullet.

Just a thought