Read with interest the thread on using fillers and those that said that the brass on some of the larger cases like the 45/70 ended up being ringed. Well a couple of weeks ago the following happened. I have had 3 people tell me to use black powder for large cases like 45/70 than use smokeless charges that try to approximate black powder loadings. Powders like Unique ect. They said over time you could slowly ring the chamber. Now we are not talking fillers here folks just smaller charges of fast powder to imitate black powder loads. Who were these folks? Well my gunsmith started the conversation and told me to switch to black then I emailed Steve Garbe he told me the same and then a buddy who shoots a lot of black in every thing from muzzle loaders to cannons. So from now on I will shoot black in my 45/70 Roller just to be safe. I figure Steve Garbe is pretty much a expert on the subject of shooting older guns that use large cartridges like the 45/70 so I do plan on heeding his advice even though I know some of you will say they have been shooting Unique or powders like it for years with no problems. I still plan on using 2400 for my bottle neck cartridges, but I will switch to black for my 45/70. Since my gun is a roller it will be easy to clean and I own 4 muzzle loaders now so cleaning up after black and its substitutes is kinda old hat. Jim