Big Stick is right on in his suggestion of seating the bullet way out. Some rifles just don't allow that. (Such as short action Browning's---magazine runs out before ever reaching the lands). I had a Ruger M77MKII that was VERY picky about what it liked in cartridge length.
My suggestion is go out and buy 3 or 4 boxes of quality ammo (different brands/bullets/weights) and see what the rifle 'likes'. I depend on anything federal with factory bullets, nosler, or sierra. If none of those shoot well, you may have problems. I know that's a little pricey but really helps with later load development and confidence. Even if you roll your own it's nice to know which factory loads shoot well in your rifle, especially if you travel. Just my .02.
