The 425 WR is harder to make properly feed from a staggered Mauser magazine, due to the heavily rebated rim. It's doable, but much less practical than the 404. Brass, bullets, and ammo are scarce. Don't walk- Run from the 425 WR, if you are building a custom rifle as an investment. Having said that, properly built 425's have a good reputation on African game. The round, and rifles that chambered it, were never as ubiquitous as the 404 Jeff became.