I am posting this question here because I think people here are more familiar with machine gun specifics. I found a card board box of obviously military ammo in the old family storeroom. It is rimmed, about 30-06 size and was about 50 cartridge to the box, lying between paper dividers. No markings on the box. I thought it was 7.7 Jap but the headstamp showed 1909 and I dont think that anyone was using spitzer bullets in 1909. I pulled out an old brass machine gun clip/charger (I dont know the proper name) that had been around for 60 or 70 years that I remember. It held 30 rounds. I pulled a cartridge from it and it was identical to the ammo with the 1909 head stamp, but had a roman numeral 7 and the letters MF and a 1943 date. I did some comparison and figured out it was 303 British but would the British have reloaded cases from 1909 with the more modern projectile? What WW2 British machine gun used 30 round strips? This is a curiosity for me? Sorry for being long winded. Thanks for any information. Grant.