Boyd, I'm a dedicated "t-der" but don't have a lot of empirical data to present. When we started having IBS matches at my range in 2004 some of the guys were using "Danzac" and the concept of putting a high-grade, high-temp coating between the bullets and the barrel made sense to me. In my experience it does nothing to enhance or improve accuracy. It makes barrel cleaning very easy and simple, using just Kroil and J-B's, and in most calibers it increases the round count before cleaning is necessary. I normally shoot an entire score match without cleaning with the 30 BR, though my 6 PPC still wants a bit of cleaning after 25-30 rounds. One of the guys from Maine has over 8,000 documented rounds on a 30 BR barrel with t-d, and still shooting competitively.
I literally have not shot a bullet in any firearm I own, other than a Glock 9mm and CZ .22LR, without t-d coated bullets in years. I even tried it on .38-55 cast bullets with good results!
I don't get into any of the lengthy debates over it as I have no evidence to prove any claims. You can't shoot 4,000 rounds through the same barrel with and without t-d coated bullets so it's not possible to prove the value of t-d. You either believe in it or don't.
I read the info that Norma compiled a few years ago on m-d (moly) and it helped to confirm my trust in the t-d. It's a pain in the butt to apply, can be hazardous to your health if not used carefully (inhaling it isn't a good thing to do) with a good face mask. I coat my bullets in Skippy peanut butter jars half-full of steel BBs and approx. 1/8 tsp. of t-d to 100 bullets in a Lyman vibrator. I have four bottles and these BBs have coated many thousands of bullets. I pour them into a modified colander which traps the bullets and passes the BBs, then slog them off in a bath towel. The result is wonderful "silver bullets".
When I first started, I used a patch impregnated with t-d after cleaning for a while, but no longer do because I don't see any benefit to it. I do not have a borescope but have never seen any build-up of any kind and have never heard a report of t-d build-up. Even in some Savage barrels that were so rough as to pull tufts off a cleaning patch, I have never seen a trace of copper when using t-d and cleaning with Kroil/JBs. I don't own a rifle that has ever had a brush down it's bore -- ever.
I am reluctant to give my cleaning regimen because it is pretty simple. I run a patch thoroughly soaked with Kroil down the bore; dip a bit of J-B's out on my finger and rub it into a patch which I then short-stroke down the bore, followed by a patch with Kroil to clean out the J-B's, two clean patches and then a clean patch with just a single drop of Kroil in the middle. This, of course, is followed by the normal lug-recess cleaning and chamber wipe. I clean and lube the bolt every time I take it out of the action.
My 30 BR has 2,800 rounds through it and still shoots way better than I can shoot it; my 6 PPC had 600 or so non-coated rounds down the tube when I got it and I have put 1,800 coated through it and it will still put five into a "zero" if I get my act together.
I can neither theoretically nor practically find a single detrimental fact to using tungsten-disulphide (Danzac). I get mine at Rose Mill, which can be found online.
