Did you bother to check to see how far you are seating the bullets off of the lands? Regardless of what bullet you choose, you should know this, but it is much more important with monometal bullets. And if the bolt is hard to lift after firing at 63gr, you shouldn't fire loads with more than 63gr of powder until you determine why the bolt is hard to lift after firing at 63gr. And in case you were not aware, not all loads listed in loading manuals will be safe in every rifle. That is why the manuals advise working up the powder charge while watching for pressure signs, and hard bolt lift after firing is often the result of excess pressure.
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Only accurate guns are interesting.
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