All copper bullets are longer for their weight, but I didn't have any troubles loading these 270 grainers in my .375 H&H. My loads fit the magazine just fine. I used a Lee Factory Crimp Die to crimp the bullet in one of the grooves. I crimp all my .375 ammo. It seems to give better accuracy

The TSX's I've shot shoot exceptionally well, which is something I didn't always hear about the first X-Bullets (which I never used). My .375 will shoot 1" or so with a variety of bullets, and the TSX's are right in there with them and have the same point of impact as the Nosler 260gr Accubonds. In my .280 Ackely, the 160 gr TSX's will shoot one ragged hole at 100 yards, but I haven't had a chance to whack a game animal with them yet.

Like I said before, this is my first use of a TSX to take a game animal, but more are sure to follow....