Yep, Nosler reload guide states 63.0 gn as max with IMR4831. Your 62.5 gn load shows promise, try 62.3 and 62.7 gns.
Also have you measured your max COL ? Ie where the ogive hits the lanz? The saami COL at 3.29 is almost certainly still quite a big jump to lanz. Seating pills longer, reducing jump may tighten up your groups.
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