I'm getting ready to load 45-70 for an 1874 Sharps using the "weak action" loadings for SR4759 & 5744 and 405 gr lead bullets. This means I'll be using the conservative 18000 CUP limit, even tho' the original equipment loads ran closer to 28000 CUP. So what do I look for as a pressure indicator in these low pressure loads? Is this even a concern? Max loads in the tables indicates the 18000 CUP limit, but is this enough to show up as a flattened/loose primer or swollen case just above the web? Wouldn't think so. I'm asking because there is considerable discrepancy between expert sources on the max/min loads for powders and the related pressures and velocities. I'd like to have an indicator to watch for as I play work up with these loads.