3031 is one of my favorite powders for a lot of cartridges. I loaded 27.0 grains under several different cast bullets weighing between 170 and 190 grains before I ever knew there was powder coating, probably far before it was a thing. Seemed perfect for a gas checked lubed bullet. It worked very well on Washington state Blacktails cast of straight wheelweights shot from a late 70's model 94. Since I started powder coating I have not even thought about going back. Easier load development, don't have to mess with lube, higher working velocities. Not saying my lubed bullet loads were not accurate but it seemed I had a narrower window of powder charges that were most accurate. If lubed bullets have one advantage it is the lack of needing to clean the barrel because the lube won't allow rust and if the alloy/lube/velocity combination is right there is no leading either.