If you only had one choice

[Kurt]

One thing you might try to eliminate some of the lead problem is have a exposed lube groove right in front of the case mouth so when the bullet expands the lube will get pushed into that .45 degree chamber end instead of the lead. That is the advantage of a tapered front band.
If blowing sand and dust is no problem, a very thin coating of lube on the bore riding portion of the nose helps eliminating lead smears.
My .45-90 pulls lead bad no mater what I use for alloy or lube and the above just about eliminated the lead smears.