Remington No 1 Creedmoor

[Fogman01]

I am looking two original Rolling block Creedmoors. One is a 44-100 bottleneck, not the 44-100 2.6 straight as was used in the Hepburn - how would I find or make brass for it? Picture in Marcot's Remington Rolling Block Rifles p 155. He says the 44-100 BN was the case the Creedmoor rolling block chambered not the 44-100 2.6 straight that was designed for the Hepburn.
The other is an original rolling block Creedmoor in 44 S which maybe a 44-77. My Shiloh 44-77 uses Buffalo Arms brass with the .076 rim. The original is a .085 rim. Can I use the Shiloh brass in the original since the rim is smaller and would presumably seat? I would of course chamber cast to be sure of the original's actual caliber and chamber.