Ok so I got a chance to go and fire my first compleated batch of 45/70 today and one of the cases has a big split in it. Everyone of them shot well and nothing felt funny at all. The only thing I can think of is that I would shoot a round and then put another round into the gun and shoot that one and so on and so on. The one that split was in a batch of three that I loaded in the mag tube and it was either the 2nd or 3rd fired of that batch. I'm thinking maybe the recoil pushed the bullet head down a little. Does that seem possible. I had a nice crimp on them although the top of the case did not go all the way to the top of the crimp groove. If it did the cartridge would have been about a 1/16 or a 1/32 of an inch shorter OAL than they should have been. I used brand new never fired remington cases, CCI 200 rifle primers, 40 gr of IMR 4198, 300 gr hornady hollow points. All was done on a lee press with lee dies and a lee factory crimp die set to have a little more grimp than the start up crimp they suggest in the instuctions. Is it possible I had a bad case to begin with or does this look like a pressure issue? Maybe I need more crimp? I don't think I could do more crimp though. All of my cartridges were 2.550 when they were finished so I wondering if this might have just been a fluke. Any help you guys can give me would help.