My Prod has proved pretty accurate with it's LW barrel, at 25y. With the right pellet, it shows pretty good groups at even 50y. The problem is that I have less than 1/4 tin of those old press-top H&N FTT 5.53 pellets. It seems to have gotten a little better since new, but I'm afraid to even run a dry patch through it and change anything. I might wait until I have accuracy issues before I ever clean it.
The Mrod LW turned out real good but it still seemed to have a lingering issue, though not anywhere near a bad as the factory barrel.
Gaining more pellet choices is nice but what we're all after, with an aftermarket barrel, is 1-hole accuracy. I'd also like to see more of the BSA Smooth Twist barrels tried in the Mrod/Prod and encourage anyone willing to try.
If testing accuracy of a barrel, don't forget this important factor: I know I'm sounding like a skipping record, but using a scope-cam is invaluable during accuracy testing. Even a smart phone should do the job, just during the testing process. Mounts are available for them at OpticsPlanet. You'll benefit from keeping the exact same 'cheek weld' and can truly determine if
you shot accurately or pulled it slightly when engaging the trigger or during the follow-through. Even the smallest variance translates to larger groups on the target. Short of a camera, you'll need a positive reference (a "kisser") for your cheek-weld and eye. That leaves the variable of shot accuracy and follow-through. Best of luck in determining your performance in these two areas while relying on real-time observation and recollection.
You need to be able to analyze video, preferably in slow-motion, just as a golfer analyzes his swing. But you're not just trying to improve your form, you're testing the accuracy of a gun's barrel. It's only fair to remove as much of yourself as possible, to be able to discount results of you and document results of the product.