I’ve seen 180 hornady, 200 partitions, 180TTSX, 150tsx and 130TTSX used in various 300mags. They all work. Last few years I’ve been loading 130TTSX for a few buddies in their 300 mags after I tried them in my 308. They have all been very impressed. If I was going to shoot my 300 I think I’d try the 130TTSX. Probably a little less recoil and stupid flat trajectory out to where most game is shot.
