I'd say your rifle probably has the common .30-06 twist rate of 1:10. So it should shoot most factory loads pretty well. I'd try anything between 168 and 200 gr but you may find accepable accuracy with bullets a little lighter or heavier.I do not own nor have I ever shot an XL7, but the twist rate is what you should go by when considering bullet weights/lengths. My advice is buy a box of what you want to shoot and see how it does. Odds are it will be fine.
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