I'm sorry I didn't see this the other day Quinc, it was the at the bottom of page one and missed it. No such thing as too many questions on a forum.Quinc wrote:How do you calculate CUP in your reloads? Also If i stick with the minimum loads in my Lyman 49th manual for the marlin and Winchester I should be fine with the RG? I have a chrony if that helps.
Sorry about flooding the forum with my n00b questions! =)
As far as calculating CUP, I actually use PSI because I have pressure trace equipment that measures that value. The equipment uses extremely small pressure sensors that are glued, with a special industrial super glue, to the barrel in a position that is at the front of the chamber. A calibration procedure is used to correct the gauge, normally very small adjustments in the neighborhood of 2K PSI, and then you shoot and record the data. The gauge has a pigtail that attaches to a "box" and that box is attached to your laptop. Everything is run by software loaded on the laptop. Along with that, I use QuickLoad to generate all of my suggestions for load data. Against the the pressure trace equipment, I have learned through experience, that it is the most accurate generator I have run across. I find huge errors or differences in published data because it was generated in pressure barrels or with firearms and components that are typically quite different from what you are shooting. If the time is take to really learn QuickLoad, it is the most accurate reloading tool you will ever use.
I have recently started to use the only CUP calculator I have ever seen that is worth a darn. It was created by Tom Myers who owns TMT Enterprises, a shooting software outfit. Tom is one of the smartest guys I ever met. What is inside his head scares me, I don't know how it says in there but the truth is it doesn't. It boils over and out into his products. Anyway, his CUP calculator is part of his Precision Load Records Pro. Loads generated in that calculator and expressed in CUP match results that have been proofed with the pressure trace stuff and QL.