Just load the 50 rounders with 10 and call it even
No seriously .... good for you for buying an awesome gun that most won't touch cuz they can't have 50 round magazines in Mass. Have you started reloading for the 5.7 yet?
Not yet but i have been saving all my brass in anticipation. The only brass i really lost is the stuff i shot at the pumpkin shoot. It is definitely fun to shoot.