Why is my rifle hard to load?

I got a scoped marlin 336w last year. I haven't put 60 rds. out of it yet, and I load it straight into the chamber instead of the tube magazine. It seems like I am going to scrape the bullet in half when loading into the mag. I even see the shiny brass getting scraped up, and it is hard to push the spring down. I live in the southeast U.S. if that helps. Also I use remington, Federal, and Hornady ammo.