I presently have a Ruger 77 tang safety rifle, built in 1978>, that started out life (I think) as a 7mm Remington magnum. I wrote "I think" because the barrel on the rifle was a 7mm RemMag barrel, and I do not know anymore about the rifle then what I have posted. For all I know this rifle could have started out life as a 30-06 and someone fitted a 7mm RemMag barrel up to it and then decided to sell the gun; it came from Gun Broker or Guns International?? I bought the rifle as a donor rifle to build my son a Christmas present, but...he mentioned that he wanted a 300 WinMag at one point, so that's what I decided to build for him. I had the rifle rebarreled with a 26 inch Lilja barrel, chambered in 300 WinMag, action blueprinted, trigger job, glass and pillar bedded. The rifle sat in the safe for about a year (COVID) and we just got to the range with it a couple of weeks ago. At the range we had a feeding problem where the rounds would either not pick up, or they would jump up past the bolt, or...even jump up and get caught behind the extractor, so.....there's a problem!!! I did not "think" that there was that much difference between the 7mm RemMag and the 300 WinMag that would cause a feeding problem due to the case dimensions???? The changes that I made was to swap out the stock with another Ruger 77 stock because it was a better piece of wood, but...I clearanced, glass bedded and pillar bedded the stock myself; and....this was not my first Ruger 77 that I've bedded. I have too much money in this build to scrap it, and I would appreciate anyone else's experience/input with this problem.