Found out some interesting info about the 1902 Roller. How did I find this out? Well, there's an article in this latest Blackpowder Cartridge News. Serendipitous that is.
First, the rifle is not chambered for the 7x57 Mauser. Like the .30-03 vs the .30-06 cartridge, the rifle is chambered for a slightly different Spanish 7mm Model 93 cartridge (aka 1893 7mm Mauser).
E.g. case length is 2.24" vs 2.235" (older vs newer) and length head to shoulder is 1.71" vs 1.470" (now that is the critical headspace length). Also, Winchester brass has a thinner rim and might work whereas Remington brass might not.
My friend is likely pumped to find this, I know I am.
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