I hang out mostly in the shotgun forum, been loading shotshells since '75. I'm about to begin loading 9mm and use Vs CASTING MACHINES 122 hi-tec coated bullets initially. From what I read these seem like a good choice. I like the big meplat and there seems to be ample choices using shotgun powders I have on hand for medium to high power loads. (Longshot, HS-6, 800x, Green Dot) The first question is how much pressure/velocity increases I can expect for data using 4" pistol barrels in a 16" carbine and are they safely interchangeable from one gun to another? The second question is would you gents share your experience and pet loads in rhis regard? Not really interested in light loads as my interest is in stopping potential bad guys or poking holes in a pig or two at 50 yds or less. Thanks for your help in this regard!