Cost wise...somewhat higher for sure...........I used Remingtons nickle brass exclusively for all of my 45-70 loading...I buy it factory new from Grafs & Sons... I like the looks of the finished rounds I produce and they are much easier to clean...and they won't tarnish as regular brass cases do,,, I also use the Lyman M die for gently belling the case mouth,and Hornady one shot to lube with... and in using them I never have had any flakeing or case mouth splits,or scratched loading dies...as a lot of folks have had with them. One thing to remember...they are stiffer than regular brass...and the case capacity is slightly less at least for the Remingtons,and the Starline I have,so if your loading up to the max...watch for pressure signs very closely...otherwise...they are fine...
Mac