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.

I prefer classic.
Semper Fi
I used to run with the hare. Now I'm envious of the tortoise and I do my own stunts but rarely intentionally