Larry, I own an early 1903MS and know how expensive factory ammo is. I bit the bullet and bought a couple of boxes of RWS factory ammo along with a set of RCBS dies. Reloading the empty cases is much cheaper and the bullets are readily available in a couple of different weights. By the time you buy the case forming dies, trim dies and all of the other stuff I think you will find that factory ammo is cheaper in the long run. Another factor is that unless you are experienced in the procedure, shell conversions can be a bit tricky/hazardous. I myself wouldn't take the chance of damaging myself or my prize carbine to save a few bucks.

Good luck.

Charlie

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SWCA # 2294