Free: Contests & Raffles.
A longer barrel does not necessarily mean more accuracy. -Steve
I'd go with a 30" barrel,should dial it right in.
Anyone that would complain about less than .75moa/100yd from a magnum rifle should have their head examined. Do you still want this to be a hunting rifle or are you planning to compete with it? What is the time interval between shots for barrel cooldown or are all of these shots from a cold barrel? If not, How much does the cold bore shot deviate from the third - fifth warm barrel shot? Although I don't even own one, I'm partial to the Schillen barrels in fluted bull design that disipate heat incredibly well and from what I've seen will print groups like you show even when the bore is warm. But don't expect much better accuracy from a cold bore shot. All you can strive for now is better consistency from a warm barrel. -Steve
A longer barrel is more likely to decrease accuracy; not the other way around. That's especially true with lighter contours. If you're getting groups under 1 MOA with a hunting rifle you're crazy to do anything.
Although you don't need a sub 1/2moa rifle to hunt with, it surely doesn't hurt. My personal 338 Edge will shoot under 1/2 moa all day long. Magnum rifles can be tack drivers, they just need a good barrel and good machining