I'll look into the diameters next time I have a chance to buy a Winchester 333 box(I've already got 4 boxes of Federal 550 laying around).kragluver wrote:I cast and shoot cast bullets in both rifle and pistol (obviously not for 22LR though). Your problem is most likely caused by a rough spot in the bore and/or the Win 333 bullets run slightly on the small side.
While pure lead does melt around 600 deg, the lead used in cast bullets is alloyed and typically melts around 700-800 deg. The bullets cannot get hot enough to melt during the very short time they spend in the barrel. Leading is typically caused bt 1: undersized bullets (usually the culprit) or 2: lube failure (not typical). Try mic'ing the diameter of the Win bullet vs the Federal.
Finally, 22LR bullets are not jacketed - some are plated but none that I'm aware of have a true jacket like larger calibers.
Like all firearms 22s will show a preference for one type of ammo over another. Shoot what works best in your particular rifle. I have had good luck with Rem and Federal bulk ammo in my 22 semi-autos. Not so much with Winchester though.
Thanks for the advice.