You're possibly thinking of N165. 565 is very stable per Vitahvuori.
70gr shooting 180 ELDMs with CCI250 primers. Average 2976 with pretty good SD/ES. My worry is how much over book max I am.
Yeah that sounds pretty hot. How many times have you shot and reloaded the brass at that charge weight?
I mean every barrel is different. I currently have a barrel that is pressuring out 3 full grains earlier than 3 other barrels chambered with the same reamer. So it’s not impossible that yours could be the other way around. If you aren’t getting a legit bolt click at the top of the case extraction after the second firing, you’re low enough IMO.
A safe and methodical way to find out is to load a pressure ladder and see where visible pressure signs appear, then make sure your load is at least 0.5gr below initial signs (ejector swipe and flat primer), and at least 1 grain below heavy bolt lift. I use 0.5gr increments for 7 PRC pressure ladders and stop at the first sign of heavy bolt lift or a clicker.
I would fully disagree from my testing. Im my 22 inch 7 prc I see about .7 fps per degree Fahrenheit shift. It is also somewhat non linear and unpredictable. Works great as long as you know what you are dealing with. There is not a stable powder on the market. It is impossible.... it can be more stable than others but that doesnt make it "very stable". Retumbo is as close as I have found to stable. Varget is also great, but we are talking 7 prc. This will vary based on brass, dryness of powder, primer, barrel length, cartridge, bullet, etc.
