load data for a 255grain bullet

[wgr]

i have a long colt mold that cast a 454  255grain bullet  i can paper patch it to 458/459   would like to try it in my 45-70 bc  but cant find any load data for it  can anyone help out i think it would be great for target shooting r if it works out maybe deer 

[Ray Newman]

Depending upon the rate of twist for the rifling & the bullet alloy, what you want to do may or may not work.

Most paper patched bullets work better w/ pure lead or a very low lead to tin alloy, such as 40:1.

From what I've rad 'bout paper patching & talking to Shooter who do paper patch, a .454" dia may very well be too large in dia to work well.

Do you know the twist rate & bore dia?

What is the make of the rifle.

This site may have some info for you:
http://www.iastate.edu/~codi/PPB/PPB.html