[John McMahon]

Good to know! I’ve used Chore Boy copper cleaning pads in a similar way, but it sounds like this is better.

[John McMahon]

I should also add that (like the OP) I was using TiteGroup when testing these bullets. I am open to the idea that a slower/gentler powder might produce better results.

[John McMahon]

What worked for me:

Step 1: Soak several cleaning patches in Montana X-Treme Copper Killer and stuff them down the bore until full. Put in a ziploc bag and allow to sit overnight. Fouling should scrub out easily after that. Any stubborn spots can be removed with JB Bore Cleaning Compound on a patch wrapped around a jag and applied vigorously.

Step 2: Go back to using RMR’s excellent copper-jacketed bullets.

I love RMR’s products in general, and I like the fact that they think outside the box, but the zinc-jacketed bullets simply don’t work for me.
I echo all of the OP’s caveats regarding advice from other users. I would add that I know how to load Hi-Tek coated bullets so that there is no swaging of the base or damage from over-crimping, and if that careful process isn’t good enough for a particular bullet, then that bullet is not for me.

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