controlled round feed

I'm hoping that someone here has an idea. My Ruger Hawkeye Alaskan in 375 RSM will not accept more than 2 cartridges in the magazine. I can almost get 3 in, but the 3rd one won't quite fit. I bought the rifle earlier this spring New in the Box. With 2 cartridges in the magazine it feeds and...

Hello there purchased the rifle and i really like to know theres anywhere a 3 position safety available and im searching for another trigger like a timney. Unfortunately ive never seen them anywhere Sorry for my bad english, im from switzerland :-) Greetings