hey, im no expert on this just started tinkering my self. Comparing to i-4350 it is definity slower but to be safe but not waste barrel, bullets, etc. i would start 1 grain over your pet load with 4350 and go up IMO. I didnt clean because i only shot a few groups. I pretty well fired 3 quick at time of sat. shooting but temps was 38- 40 degree then left barrel cool 5-10 minutes and shot again. When i was testing for pressure friday eve just shooting 2 at a time temps was 72 degree. I started at 50 grains going to 56 grains that evening, cleaned gun after that because it hasent been cleaned for awhile. Sat. morning i shot 1 round to dirty barrel before i sat chronograph up. I currently shoot 54 grains of i-4350 for the 85 sierra bthp but anything past that groups open up but cant remember pressure due to 1 year old testing. I will keep in formed dont know when i will shoot next but let me know how you do. One other thing on the label of superperformance it says 73 grains for hornady 155 a-max for 300 wsm
@ 3300. I loaded my son in laws 300 wsm with i - 4350 65 grains for 150 nosler bt getting around 2950. I didnt have time to play with it due to it was a last thing before deer season loading ordeal and the browning a bolt shot around 3/4 " 3 shot group. Told him to take it hunting i would play with it later and it was a freebie of course including me buying dies, bullets, and brass.