If you've got one that can hold 1.5 MOA, then there's absolutely no need to change it. And maybe Ruger's barrels have gotten better over time, but I have seen quite a few in the shop that were more like 12 MOA rifles. Very long throats combined with short magazines, slow rifling twist, and large groove diameters do not lead to great performance. Keep in mind this is the older 44 mag ones, I have never worked on a 357 one other than to thread them for suppressors. But the 44s most definitely benefited from a Shilen barrel 1:16 and being chambered with a reamer featuring a much shorter tighter throat. I never had them go over 1.25 MOA after doing that and customers were very happy with them.