cajunautoxer wrote:As far as varmit rifle I just picked up a DPMS 24" bull barrel. I don't know if 16" would be enough IMO.
The main value of the longer barrel is higher velocity, and possibly another 50-100 yards of range. The 16" bull barrel from DPMS will be just as accurate as a 20" or 24" bull barrel from DPMS, given the same twist rate — maybe
more accurate since the shorter barrel is actually stiffer than the longer barrel. The whole point of bull barrels is stiffness, and stiffness is the result of thickness to length ratio. Even a really fat barrel becomes less stiff the longer it gets, so it does not follow that a longer barrel is more accurate than a shorter barrel. And indeed, the only reason a longer barrel is preferable in 1,000 yard competitions is because it gives more time for powder to burn and develop the velocity which will carry a bullet at extremely long ranges. This is why many tactical bolt rifles designed for urban sniping only have a 20" heavy barrel. They don't need the range, but they do need the accuracy.
We have a 16" DPMS bull barreled "low-pro" upper laying on a shelf. My son bought it for a carbine he was building, and set it aside for an HBAR barreled upper he purchased later because he was unhappy with the forward weight bias of the carbine with the bull barrel on it. That said, it was extraordinarily accurate, even when mated to a standard DPMS lower using the standard DPMS parts kit with a standard trigger.
My son and I also own 24" barreled varmint rifles, and they both shoot well. My son's is a RRA 24" Stainless varminter, and he has shot 5 rounds into .25" at 100 yards with it before. He's let total strangers at the range try it out, and on their first attempts, they've shot the best group of their lives with it. The thing is truly magical, and it is the most accurate rifle in our safe. However, it also weighs more than any of our other rifles, including a couple of heavy barreled .308 bolt rifles, one of which has a 26" barrel. In short, it is not "handy," and it would make a terrible "truck gun." If an all around use truck gun is what you're looking for, compromising for a 16"-18" HBAR will make a much better all around use rifle, particularly if it is important to you to be able to mount any kind of flash suppressor. You'll still get pretty good accuracy, and the rifle will be much more fun to carry in the field, quicker to the shoulder (and sight picture), and just a lot easier to live with.
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