Velocity limit for what I called tumble lube, before Lee 'inovated' the bullet design and concept, is around 1400 fps before leading starts. This in temps up to about 100 deg F. In cooler temps speeds can be run up some from that, and in real hot weather better keep velocity to 1200 fps or under. The Marlin may deliver more speed. -- I suggest that you just smear blue soft on with the index finger of your master hand, just before seating the bullets. It goes fairly fast, and supplies more lube, which will allow higher velocities when conditions are adverse.
I definately don't recommed an LFN for 32 cal bullets, as it has too much nose and meplat is too small for good killing effect. Stick with the SFN for weights to 100 gr and the FN for 115 and heavier weights.
