I read an interesting article once about the Sims Barrel Deresinator. Pretty much came up with the results of it being a gimick. I can't recall the magazine, the date published or the author, but that was his findings.
That being said, I used to own a Browning SS with a BOSS in a .338. I fiddled around with the BOSS quite a bit and found that it was a finicky little bugger. It would change groups quite drastically. Nothing like throwing another vairable in the mix. I got to the point where I just worked up a load and adjusted the BOSS to the results I wanted. Problem is, I found that sucker liked to loosen itself up after throwing 20 or so rounds down the barrel of that ol .338. I'm sure it was the recoil and souped up loads..but the final result was I got rid of it and went to a 300 RUM. I used to think the .338 was king but after shooting 225 gr .338 vs 180 gr .30 at a 5/8" steal plate at 500 yards, made me change my mind quickly about the 338. Foot pounds of energy and better bullet selection, plus the worry of "is my BOSS in the same place", and the LOUD boom when I pulled the trigger, caused me to get rid of it!
Still, your claim has merit and I've seen it happen with my own experiments. But it's just another variable and do you want to mess with the headache? I suppose the answer may be yes, since it's just something to do and people who reload and shoot wildcats do it for a reason. Otherwise you'd just step in line, buy an off the shelf gun and shoot factory ammo
