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Yes, you could do that. Shooting jacketed bullets after lead doesn't really clean lead out well, though, and attempting to do it can actually cause high pressures if the lead quantity is great enough. The jacketed bullet will tend to push the thickest lead forward but often leaves a thinner burnished-in layer of lead behind it that is smooth enough to look like the lead is gone, but slugging the bore will detect a constriction and running a bronze brush in will raise its surface a little. Not good for lead accuracy.

Removing lead isn't that hard. Just get any kind of penetrating oil and wet the chambers and bore and let it sit overnight. You can also use Shooter's Choice lead removing formulation.

Get a copper scouring pad that is 100% copper and not copper washed steel. Chore Boy brand, for example. Use a magnet to check if in doubt about what you are purchasing? The magnet won't stick to pure copper. Wrap a strand of the copper pad around a bronze brush that is one caliber undersize for the gun until you can build it up to be a bit snug in the bore or chambers. With a few back and forth strokes it will scrape most of the lead out.

There are commercial versions of that kind of mechanical lead remover. The Lewis Lead Remover and the Hoppe's knock-off of it. They use an expandable rubber plug and a fine bronze screen to do the scraping.

There is now also a true lead solvent available. It is calle No-Lead and is made by Sharpshoot-R, the makers of Wipe Out for copper fouling. Midway carries it.

You can also use an electrolytic bore cleaner like the Outer's Foul-Out. It will be a little slow, though, as each chamber and the bore would have to be done separately. But the cleaning is complete, microscopically.

If you want to cut way down on leading building up in the first place, firelap the bore and chambers.

Your 7.5 grain load of Unique will work with the 185 JHP, by the way, but I expect the velocity will be in the 900+ fps range. If you just want to try to scrape lead out with a bullet (still not a great approach) try about 5 grains of Bullseye, instead, to slow it down a little.
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