The Remington 750 series is supposed to be an improvement over the 7400 series. What kind of problems are you reading they have?
The 750 is no longer in production. Hasn't been on Remington's website for a couple of years.
Short answer, a bolt rifle does everything better with rifles larger than 223. Even the best semi is going to weigh about 2 lbs more than is possible to make a bolt gun and will simply NEVER be as reliable or accurate over a wide range of loads. Semi's can be reasonably reliable if the ammo is made within a narrow range of pressure and bullet weights. And accuracy can be acceptable, but will never approach a bolt gun.
The only alleged advantage is faster repeat shots. This is a positive in the military who need to provide covering fire, but not in a hunting rifle. Yes, you can empty the magazine on a semi faster than you can with a bolt gun, but for someone willing to learn how to run a bolt rifle you are talking about a fraction of a second difference for 3 rounds.
And if you start requiring those shots actually hit something there is no difference in rate of fire with rounds larger than 223. It takes longer to recover from recoil on a 30-06 class cartridge and get the sights re aligned on target than it takes to cycle a bolt gun. On AR's and other low recoiling rifles you can get back on target somewhat faster.
PA hasn't missed a thing on big game hunting. While semi-autos have been legal every where else virtually no one uses them.
