Don't know but I suspect a little more care goes into the Remington 5R barrels and the hammer forging mandrels may get less wear or be replaced sooner than the regular production run of barrels. I think this is true of the 40X rifle barrels even with conventional rifling. They can be easier to clean and sometimes produce slightly higher velocity but hard to generalize about all of them. I have not heard of any negatives to them. My experience is with Bartleins and you would expect anything they turn out to be good.
"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli
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