re: know of any good sites/stores that arent out of ammo?

Magazine. Also I wouldn't buy a non ruger extended mag for your "22/10". They tend to have FTF issues. Butler creek steel lips are widely considered the best buy if you can't get ruger's BX-25 mags. I can't say I've seen a 50 round mag yet and I'd be very wary of buying one if I did see it. 5 ten round mags that fire consistently are way better than a 50 round that stovepipes you every 3 rounds. Picking up your ejected unfired rounds for 10 minutes wastes more time than it's worth.