I had a saami chamber and ran H1000 at 76.5 grains 195 at 2950. Now with my new reamer and barrel brux 26 inch 1;8 I ran h1000 max out at 3050, retumbo maxed out at 3100 but n570 maxed out at 3200. I settled at 82.3 n570 coal 3.745 (lands at 3.765) and with zero pressure am getting 3115 for the 195. Seems as if the N570 is dirty though compared to H1000 and Retumbo. But wow the accuracy and speed with low pressure the N570 just works. I stopped at 3200 but probably could go higher as I did not see any pressure signs.