Term is LANDS not Lans. There are plenty of rifles that shoot just fine with a jump to the rifling. Freebore does tend to lessen pressure. Perhaps you can work up safe loads with a bit more powder to get your velocity?
If you were to try Berger hybrids you will find they are very seating depth friendly. In fact my experiences all bullets tried have worked just fine with any seating depth I tried! I simply seat to fit and feed from magazine and work up powder charges.
Longest jump with a berger is .160" in a 300 WSM
with excellent accuracy.
Berger recommends the following test to find your rifle’s VLD sweet spot.
Load 24 rounds at the following COAL:
1. .010″ into (touching) the lands (jam) 6 rounds
2. .040″ off the lands (jump) 6 rounds
3. .080″ off the lands (jump) 6 rounds
4. .120″ off the lands (jump) 6 rounds
Berger predicts that: “One of these 4 COALs will outperform the other three by a considerable margin. Once you know which one of these 4 COAL shoots best then you can tweak the COAL +/- .002 or .005.”
I see no reason why this approach wouldn't work with other bullets. Why make a single shot out of a repeater?