IMHO I feel you can probably see 35 fps variation in case you ran exactly the same load yet again with regular primers. For anyone who is not comfortable, load 5 conventional primed conditions, cost, seat bullet and shoot them first and find out the way it goes... Powder Valley https://cci-large-rifle-z-ndh-tch02356.educationalimpactblog.com/53488205/5-essential-elements-for-federal-215