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Jeff,
It will start to etch a SS barrel with just a few minutes. Do a real scientific test with aerospace quality controls. My eyes were opened at NADEP Cherry Point by a couple of civilian aerospace PHDs. The question is whether or not effects matter to you. In my mind there are better methods without any of the drawbacks.
On pressure lapping ask folks such as Carl Kenyon, Clint Fowler, or Ken Johnson. All three used in one form or the other, even on top quality barrels though usually starting at 800 grit. I know that it reduces fouling, eases cleaning, and nearly always show an increase in accuracy (sometimes small) while I have never seen any negative effects from proper pressure lapping. Sounds like you had issues with your procedure/system. I know from actually checking and measuring with aerospace borescopes and that properly done is does no harm while improperly done with improvised stuff can easily/quickly ruin a barrel if not a firearm.
Moly coating does reduce fouling and reduces barrel heating. We did a test with two AR-15s that were as identical as possible. Load was lightly prepped LC, CCI 41s, 748, and Sierra 69s (one set plain the other moly’d) loaded so the MV average for 20 shots were with in single digit variance. Added three thermocouples to each barrel then shot them side by side at the same time on cadence. The moly was significantly cooler while able to shoot better ten round groups at 500 yards at the end (without cleaning through 90 rounds) with both shooters swapping rifles (i.e. two ten shot groups while removing shooter bias). The rifles were cleaned then shot again for two ten shot groups with the non moly’d barrel taking longer to settle back down. Both shooters were AD Marines, one just off a tour with the Gold team and the other the former Texas A&M rifle team captain.
I never understood Teflon in either a firearm barrel or engine as it breaks down to some really nasty acids in the vicinity of 500 degrees F.
On multiple uses of the Foul Out I may not have stated it clearly. All five stopped working and when cleaned with patches/JB still showed copper fouling. The powder fouling felt kind of soft and would come out easily. Thus requiring multiple uses. Our theory was the fouling was so bad it was layered on thus stopping the de-plating process.
I have a large Hornady ultra sonic cleaner. It will spoil you on initial cleaning.
S/F, FOG
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