That would mostly depend on what caliber you choose. A 300 win mag was designed to fit in a 30-06 length action, so generally to seat them to the lands they don't always fit in the magazine.
I own several model 70's, and a few tikka's. I like them both.
The new model 70's I think are the superior rifle. I'm a big believer in the controlled round feed action. Positive control of the cartridge from the moment the bolt contacts the case head. They have the MOA trigger--which is amazing--and the hinged floor plate magazine, allowing 3-5 cartridges, depending on caliber. Cost? $700- $1100
The tikka is also a fine rifle, nice triggers, a super smooth action, and mine are tack drivers. I don't love the receivers, not enough bedding area IMO. I don't care for detachable magazines, my .243 only holds 3 cartridges, and most everything is plastic. Cost? Around $500-$600 generally.
I don't think you'll go wrong with either, but if you have the means, I'd suggest model 70.