The same seller called me last night letting me know he will be willing to sell 7 more of his rifles and let me have a first crack at which one(s) I wanted to buy. I went over early this morning and looked them all over and they are all very nice rifles. 3 of them have 46" barrels and are .40, .45 and .50 cal. ..., My question is this simply put, what would a 46" Barrel give you that a 33" barrel couldn't if both barrels were same twist rate and caliber.
Ah but they're not, eh? From your descriptions, the long barrels and short barrels don't have a crossing over caliber...
So folks have mentioned that the longer barrels will give you a longer sight plane. This is true and make it easier for a shooter's eye to give an accurate shot. Will the barrel be more accurate, no, if the accuracy of the barrel itself is bad, then a longer sight plane may help reduce the group but won't fix the actual problem. The front sight must be rather thin, and you the shooter must be able to see that thin front sight out there near the end of the 46" barrel.
Some folks mentioned higher velocity. Well, on paper, yes. The problem is for example you have the choice of a .40..., were you to use a moderate load of say 30 grains for squirrel or rabbit..., the friction of the barrel walls might actually slow your patched round ball down a bit as it travels 46" compared to a 33" barrel in .40 caliber using the same load.
Some folks have mentioned shooting..., Well that too depends. A very long barrel may give you a very "nose heavy" rifle, which some folks like when shooting from the standing, unsupported position. Some rifle makers might, however, balance that rifle by using some weight in the butt..., if they didn't like it that nose heavy. I don't shoot much standing, unsupported, so that wouldn't help me much, but it might help you.
Now, the slower twist rate is not going to make the rifle more accurate, per se. It normally allows for the shooter to shoot more powder, without the danger of the ball and patch disengaging from the rifling while moving up the barrel. But this normally isn't a problem unless very stout loads are used, and most folks even when hunting don't go that high. NOW for long range shooting, technically the slower twist will allow higher muzzle velocity, and thus less bullet drop on targets beyond 100 yards, so some will say that makes a slow twist rate more accurate. At under 100 yards, likely will not matter.
Do any of the rifles have set triggers? That may be a factor to consider as well.
LD