Hello Daryl_S

Thanks for the reply,

Yes, I have a nice rangefinder that I use for Bow Hunting. I plan to make use of it with this rifle as well.

Today I slugged the bore of the rifle. It measures .462 dia over the 7-groove Henry rifling. I have now modified a 44 special seating die, into a "make-shift" swage die to "bump-up" some of the Hornady 350g bullets to the correct .462 diameter. The bullets look kind of strange with a 3/4 caliber ogive, but they should tell me what I need to know. If successful, I'll order a Corbin custom Semi-Wadcutter swage die in .462 dia.

Here is a before and after picture of the bullet.