I have a box of ten long range bullets Winchester made for Sharps.  Cal 45, 550 gr, Form L P  (?), mixture 1-14!
I am hoping to resurrect a RB Creedmore with shallow rifling made for PP, I think.  Does anyone successfully use such hard alloy for long range shooting? Does it bump up from bore size to engage the rifling?  Does it need to be so hard so as not to strip the rifling?  While fire forming 348 cases I have been using 520 gr GG bullets seated like a PP 1/8" into case, not on paper but kinda grouping on metal plate at 100.  So do you think 1-20 or 1-14?  It's a 44/100 S 2 7/16.

Hard alloys like that we're not uncommon in the old long range matches.  In Sellers book there is mention of even harder alloys.  

If you ask Kurt on the historic shooting forums you might find some useful information.  He has fired thousands of different bullets/alloy combinations into snow banks in order to recover perfect bullets for analyzing bump up.

I suspect that they would work just fine.  I use 20:1 and 16:1 for PP Money bullets as well as elliptical bullets.  They seem to work quite well, although I have not done anything like the work that Kurt has on analyzing alloys.

Chris.

I've got a couple of elliptical mould from Steve Brooks.  Not for long range though.   I've got .32 and a .38. Cal moulds from him.  Buffalo Arms also lists one or two but the diameter isn't quite right for my rifles.

Chris.

BACO will make changes to their moulds for a small fee. That's what I did with my elliptical bullet.