So I have a TC Contender with a .30 Herrett Barrel that is 10" long, with 1:14" ROT. The twist is perfect for cast, and the pistol shoots great. However, I have been thinking (why didn't any of you stop me when you smelled the smoke?) of getting a .30-30 barrel for it. I prefer the 10" over the 14" barrels just due to balance. I know the .30 Herrett is more efficient and does better than the .30-30 in a 10" barrel, but how much better is it really? Part of the reason I am thinking of this is that the .30-30 has a longer neck, so is more cast bullet friendly and allows the base of the bullet to be fully contained in the neck, which the .30 Herrett does not. Now, it doesn't seem to hurt the performance of the Herret by any means at least in my barrel, but you all know how this thinking thing gets some of us in trouble. For what it's worth, I also have .22LR, .223 Rem, .357Mag, and .44Mag barrels, so a .30 caliber of one type or another fits right in with the rest of the toy box. I don't think I want to get rid of the Herrett, just wondering if I would be really gaining or losing anything if I added a .30-30. I already cast and load for .30-30 lever guns so have everything I need to feed it, so that would not be an added cost to consider on top of this. Any and all suggestions for anything I may not have thought of would be appreciated, cause this is kind of a wild hair so I don't know if I would be gaining anything, or just duplicating what I already have. Now duplicating might not be a bad thing if there are any benefits, but if there's no benefit, then why bother, right? Edumacate me please, Gentlemen and Ladies? Thanks.