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I have a Remington Lee sporter. Supposedly Remington-Lee sporters were offered in 7x57, 7.35 Belgium Mauser, 236 Remington, 30-30 Winchester and 30-40 Krag. However, this one doesn't seem to be in any of those chamberings. A .308 bullet drops right through to the breech. So does a .311 303 British bullet, which would seem to rule out the Belgian Mauser, which used a .313 bullet. A .323 bullet (8mm) seems to fit perfectly. The bolt face is cut for a 8mm Mauser size case head, the magazine is for a rimless case of 8mm size. Were these ever chambered in 8x57?