45-70 sizing

[hiram]

Veral--

The throat on my 45-70 rolling block is .050" long and .4595" in diameter.

The bore is .457-.4575".

I can take an unsized cast bullet (.464-.463), seat it in a case so as to be short of the throat, and the cartridge chambers with no forcing.

What do I do?    Size the whole bullet to .4595" (throat size)  or just the front band and leave the rest of the bullet oversize?

Thanks

[Veral]

  Use the bullets full size, so the chamber is full as possible.  This prevents the bullets from tipping as much as if sized smaller, and tightens accuracy.  There will be no detectable difference in pressure between the large bullets and what you'd get if you sized to groove diameter, but you'll sure see a difference on target!