i recently bought an older model 11 lefty in 243. i bought a new 26" tapered brux barrel in 6.5. i had a gunsmith install the barrel and do the necessary bolt changes. its chambered in 6.5x300 wsm with a short throat. i installed a new magazine, a new sharpshooter trigger, and bedded and refinished the original stock myself. when the magazine is out of the gun on a bench i can get it to hold rounds just fine. however when i install it and put it in the stock it wont accept them. the lips of the magazine are too close to allow them to fit in. where did i go wrong? thanks for any help.