1. I am reloading 308 rounds for my FN SPR. I plan to start out with 44.0 gr of Varget (working up to the 47 gr in the manual), w/168 g SMK's and Fed 210M primers. The Hodgdon reloading manual specifically lists Winchester Brass. Is it possible that the substitution will have an adverse effect on my rifle if I substitute Federal GMM brass and still work up to the max load? (Are there differences in the "memory" or elasticity of the brass that could potentially result in higher than nominal chamber pressures?)Why do they specify the type/brand of brass? 2. The manual for the Lee Auto-Prime says not to use the Fed210M primers for safety reasons (acidental discharge is sufficient to cause serious injury...). Does anyone on this forum use the Lee Auto-Prime to seat Federal 210M primers?