The bullets should work in your barrel without leading. My best loads have normally come in under max. Generally around mid range to uppper mid range. I haven't tried any moly coated bullets. They might work a little better closer to the upper range with a faster powder since they should less resistance in the barrel. I'm only guessing here.
3N37 probably would be a better match for 147 grain bullets of any type. I use a lot of AA powders and AA7 is good for 147 bullets. AA5 works well for jacketed 124 grain bullets.