I cleaned my 45/70 bore thoroughly and applied Dyna Tek, carefully following the instructions. After 3 applications spaced 10 minutes apart and then allowing the bore to dry overnight I fired 10 shots of copper jacketed bullets. It showed quite a bit of fouling. I cleaned it and fired 9 more, again quite a bit of fouling. Cleaned and fired 9 more but still had fouling. Then I cleaned it and fired 9 cast lead bullets but it still showed lots of lead fouling. Cleaned again and fired 9 more lead bullets. Still fouling.

Wonder if I should just keep shooting it or apply another coating of Dyna Tek?

"Dyna Tek" refers to 2 products, Bore Coat and Gun Shield.
Are you applying the right one to the bore?

Presuming it's DBC. Getting the barrel really clean before a treatment can be an issue, maybe the biggest obstacle to success.

I have a Hawkeye borescope which lets me know if it's clean or really clean.

Given that scenario, I'd clean it super clean and re-apply. I'll wait on others to chime in.

DF

Sometimes more than one applications is required. I haven't experienced that much, but it does happen, especially in bores that really fouled beforehand.

I had the bore spotless before using the proper product. Used a Hawkeye bore scope to verify. Before applying the next Coat should I scrub with bronze brush or JB paste or just patches?

One more Coat or 3 with 10 minutes between coats?

Rufous, If you are getting lead fouling w/cast bullets (in a really clean bore) then there is something wrong w/bullet dia, velocity, throat fit, alloy or lube. My WAG is that the barrel was never really cleaned down to bare steel if you are getting metal fouling w/cast and jacketed both. Muddy

John,

On the second app, would you scrub it down to bare steel, or clean it enough to add to what's there?

My thinking, maybe the original application was flawed by less than perfect prep. It may be hard to tell.

DF

You can use a bronze brush or patches, or both, but not JB. I'd give it 3 coats.

I posted almost the same question before reading yours.

DF

Thanks John, will do and see how that performs.

When I do fire the gun again after this second round of Dyna Tek applications should I use jacketed or cast bullets? I would prefer to use cast (if thy will do an equally good job of curing the bore) as I have a bunch that I do not plan to use.

When I Bore Coat a barrel, I plug the bore with a Sinclair Chamber Plug and fill the bore from the muzzle with an eye dropper. I let the gun set muzzle up for a couple minutes. Then I press a piece of rubber over the muzzle and hold it muzzle down for a couple minutes. After that I set it muzzle up. Last I remove the rubber piece from the muzzle and pour the Bore Coat into a bottle. By doing it this way, I think I coat every part of the bore better.

Richard

JB,I have three new unfired barrels I want to coat.Do I need to do anything besides run a patch with alcohol on it down the bore???

You mean they've never even been on a rifle?

I feel for you brother. I have a 338 that was notorious for fouling. Second coating of bore coat finally cured it.

Should I cure with copper jacketed or will cast bullets do the job just as well?

Copper jacketed for curing

A couple of months ago I posted about a Sako 338 that was masquerading as a copper mine each time I shot it. Applying DBC, I followed MD's instructions to the T and it showed marked improvement. However, it took three separate applications of DBC for it to "take".

Now, when I shoot, it still copper fouls, just not as much....pretty much what I'd consider "average" for a rifle, which is a great improvement. However, the biggest plus is now cleanup is a snap, using Wipeout, rather than a long drawn out two day affair.

Good luck with your project. I'd look at a second DBC application if I were you.

I recently treated my own copper magnet following the instructions to a T. I've shot it a few times since and have noticed a marked improvement but I'm not sure if I'm getting the optimum result. Is there any harm in thoroughly cleaning and giving it another treatment? Can a barrel be "over treated"?

Nope, there's no harm in applying a second coat if you think it might give even better results.

Yep, had a 338 needed either 2 or 3 runs.

Have a 338-06 rebore right now that I'm going to put the 2nd coat on as it still fouls really bad by the muzzle... that was what the other one did too.

Doug at the time, said clean and recoat a couple times if needed.

Yes, never been on a Rifle.

You should be able to just degrease them, then apply.

Thanks JB,Huntz

I have now applied the product 3 times. Definitely seems to have helped. Still getting copper fouling when shooting jacketed bullets but it is easy and quick to clean up with patches and Barnes CR-10. I shot 15 rounds of gas checked cast lead bullets today and saw no lead fouling. It was with a mid range load. Will see how it does with my hotter loads but it is looking promising.

Thanks for the progress report! Pretty much parallels my experience.

Often they keep improving a little over a few more cleanings.

I've observed improvement over time. I have barrels that just don't foul, period. They only show carbon residue.

Even rough barrels usually improve post DBC. Some of those never quit fouling, just foul less and are easier to clean. Those usually will clean up with a few soaking treatments with Eliminator or similar.

I'm a DBC fan, treat everything, even new premium barrels. It can't hurt. Makes me feel better...

DF