I am looking for reloading information on the 45-95 & 45-100 Peabody. What brass to use and best place to acquire as well as powder and bullet weights. Chamber cast the rifle and having a hard time telling if it is a 45-95 or 45- 100 8

My Peabody-Martini Creedmoor is marked 44-100 and I have not yet made any cases for it.  My plan is to use 460 Weatherby brass and after forming and trimming will machine the head area to remove the belt.  I will then solder (with 450F solder) a rim to the head.  Just another project I haven't got around to but all the parts are ready.  The case that Frank at Providence Tool developed used 50-90 Sharps brass and that is too small for an original chamber.

The Dutch Beaumont basic brass is the proper head and rim for the Peabody-Martini .45-95 or 100 cartridge for the original long range antique target rifles. The .45 Turkish military cartridge of the same vintage, from the P-M military rifles is almost exactly interchangeable. The big differences were the wad column and projectile in the loaded ammunition military vs target.  I believe RMCC (or whoever took over by now) made basic brass for me with the proper headstamp, but not really any better than the Beaumont stuff.   

If you're loading for the repro Peabody sidehammers out of Wisconsin, then you'll have to check Frank's website for particulars as it is no an original cartridge from the period.