I have a Stevens 200 in .223 that shoots them both very well, and know of three others, personally that use the 75 A-Max for long range varmints, in 1-9 Savage rifles. There are many others posting load data and shooting them that love them. I will look on the 75BTHP box and see what the required twist is, but I am fairly sure they have 1-9 on the box. I know a guy with a Remington that can't shoot the 75 A-Max in his because they keyhole, but he shoots the 75's fine. I am out of the 75 A-Max, so I can not tell you what the twist says on the box. I run them around 2750, seated .020 off the lands, single load with VV540 and Remington 7 1/2 primers in WW brass.