TCG34, TCC barrels, in my experience, use different forearms depending on the barrel, whether it be 10" oct, 10" bull, 12&14"(same), 16", 21" or 23". If it is a new G2 and came with a pistol grip it is probably for a 12'' or 14'' and if it came with a rifle stock it is probably for the 23''.
I like all caliber contenders, However in the calibers you mention I have a 16'' 35 Remington that is a great deer killer and would be excellent for hogs. I have used this barrel for varmints but it isn't the best for that. The 30-30 would work for all three, but I have not shot a 7mm TCU but could reccomend the 7x30 waters.
Remember the advantage to the TCC is the interchangeable barrels and the best answer to your question is one barrel for deer and hogs(35 Rem) and another for varmints