I have several new barrels. Factory Remington, ERShaw, & Douglas premium barrels.

I’ve started breaking in the ER Shaw barrel (375) but have held off the others until shooting at the bench is more comfortable, weather wise. The 375 gets shot off-hand so I am not as needy for good weather.

I’ve Dyna Bore coated other of my rifle barrels but have not done so on these, yet.

I’m curious, would you do a ‘break in’ new barrels first, before Dyna Bore coating?

On the 375, I’ve been shooting 5 times, cleaning — repeating several times. Lately I’ve been shooting cast bullets as many as 20 in a row before cleaning. Maybe ~ 100 rounds total so far. The last few shots were with jacketed bullets and I noted there’s still a bit of copper fouling.
My plan was to continue doing so (shooting/cleaning) until there is little copper residue & little leading before Dyna Bore coating.

“Break in first or Dyna Bore first?” What would you do?

Thanks.

DBC and then just shoot ‘ em, cleaning as required...

Same here. Saves me from scrubbing them when they are new.

I spent some time cleaning my last new rifle to get all the fouling from factory proof testing out first before DBC. It took some effort to be sure I was down to bare steel.... just FYI.

Epilogue:

Coated more barrels this week end. Broke them in. Today I loaded 20 cast loads for my 375WAI. Good news is that leading had decreased significantly and the barrel was easier to clean.

When I first heard about Dyna Bore, I planned on just coating the varmint rifles. Now I’m considering coating even my 54 cal. muzzle loader.

Bugger,

From what I have heard, more than one muzzleloader company DBC's the barrels before they leave the factory.

On my hand lapped barrels I will run a patch through them to make sure all the fines from clambering them are out and then coat them. In a factory or potentially rougher barrel I would probably shoot them first to see if they foul much at all. Both shotguns and muzzle loaders benefit from DBC from what I have read. Reduced carbon and plastic or at least easier to clean out.