I had an opportunity to go to the range a few days ago and try some different brands of ammo in my Marlin 39A. I had always heard that in order to benchrest a levergun, you should hold the forend in your hand the same way you would hold it normally, then rest the back of your hand on the front rest . I did this with 4 different types of ammo, got a really good 15-shot group with the SK+, other brands not so hot. Anyway, just for fun I shot another group resting the forend on the front rest and got noticably worse results by about double the size of the previous group. I guess in this case , I read it on the internet and it WAS true!!
PS, other ammo types in order of best to worse group: Norma Tac-22, Federal Automatch, CCI SV (WAY worse than the others).

I did some shooting today, both from the bench and standing. My results showed that placing the bottom of the action on the sand bags, which is the same place I put my hand when standing, resulted in good groups.