Thread: 7 wsm who's running one

Some BB brass has a large head outside diameter and because of that it cant expand as much in a saami chamber (and loosen primer pockets)

Some confuse the tight primers with acceptable pressure and erroneously tip in more powder.

Often the extra brass in the head reduces the cases powder capacity, which reduces max velocity compared to other brands.

The end result is you often get ejector hole marks stamped on the brasses bolt face before you get the velocity the chambering is capable of.

Ie; you get results like the softest Norma/Nosler brass


I had Bruce make a lot of 338 Edge and other 338 brass, i cancelled a large order of 7 mmsaum brass after working with the first two orders.

If you ring bruce and get brass made be very specific on the dimensions you want to minimise the negatives, and you can get your name or any insignia as a headstamp for an extra $300.