I just purchased a Mannlicher-Schoenauer 1903 rechambered to .256 Gibbs Magnum. Despite the midleading ID in COTW, which states the .256 Gibbs Magnum is a reworked 6.5x55 Swede, the cartridge is a 6.5x57 Mauser with the neck shortened to 55mm. The rifle, which I don't have yet, has a 21.5" barrel reportedly in excellent condition. Case capacity should be the same as 6.5x57 and I believe 6.5x57 dies can be used. It's tempting to buy some PRVI or S&B 6.5 ammo and see if they, per chance, chamber with out trimming. If they are too long, as they should be, I can pull the bullets, trim, repowder, and reseat. Or I can just start by using 7x57 or .257 Roberts brass, both of which I have in abundance. Anyway, please let me know your experiences with this caliber and your reloading data. I have no need to hot rod the rifle as, supposedly, it was made in 1906. My main interest is in finding an accurate load. Thanks for your help in advance.