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My Rem 700 in .270 Win shoots best with close to a 1/10 inch jump to the lands. I've loaded test batches with bullets seated almost to the lands, but the heavy loads like the jump and pressures are low.
Although my caliber isn't considered "target", accuracy is close to 1/2 minute.
Bottom line should be how the rifle shoots with rounds short enough to go through the magazine. If you want competition loads and can't get them to shoot at magazine length, you may need to have two types of loads with different seating depth, but don't give up on the shorter lengths without trying a few things.
If you don't get the accuracy from shorter loads, you might try a slower-burning powder that minimizes initial velocity. I use Reloder 22 in the .270, but it's probably too slow for accuracy loads in .308 Win.
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