Need some help and think I've found the right place and folks... I have a new Handi in .223 cal. Not positive, but I think the twist is 1:12. Not sure how to find out if that is correct or not. I've put all 5 grits of the Tubbs bore polish rounds through it and have cleaned the barrel...well! My first attempt at the range didn't produce the results I wanted. I shot sierra 50 grain blitz kings, cci 450, 27.7 grains 748 powder. The gun is scoped with a Leupold 4X12X40. Shots were all over the place. My local gunsmith said that after three shots the barrel heats up and that explains the randomness of the shots (obviously not a Handi-fan). I've read comments about the fore stock screw and how over-tightening may cause this problem. Not sure what to believe! I have other rounds, powders and primers at my disposal (55gr Sierra HPBT #1390, 50gr Sierra spitzers #1330 and the blitz kings, Varget, IMR 4895, and 748 powders, and cci450 and fed 205 primers). Can anyone offer any insight? Load recommendations? I don't need to shoot the wings off a gnat at 100 yards but, I do enjoy the confidence of an accurate gun. Thanks in advance!