Desert GP100

One more thing that can cause unburned powder is a weak crimp. I had this problem with some of my reloads and I could see specks of unburned powder left in cases and around the cylinder. After doing some reading I found an explanation for inconsistent ignition caused by a weak crimp. Since then I use a fairly strong crimp on all my .38 and .357 cartridges and the problem has gone away. I use a Lee Factory Crimp Die in a four die setup.

sash

I have some serious doubts that plating from a bullet is the culprit. Much more likely to be unburned powder. Unique seems to be a common problem in that area, unless loaded close to the max. Also the crimp issue mentioned by Desert GP100 should be looked at. My son and I have fired a thousand rounds a month through GP100s for years with both cast and plated bullets, and have occasionally had gunk under the ejector cause problems. They were always when I was working up a new load, or using a new powder, or trying a light load.

Let us know how things go, because new info is always good.

firescout

That's how I learned to do it: hold the gun, muzzle up, in the shooting hand (right) and slap the ejector rod down with the palm of the left hand.

ExArmy11b

Some factory ammo, like the Remington UMC, also has some wierd dark yellow flakes that can get under the ejector star after rounds have been fired..........I don't know what it is, but it's always in the bore and chambers when I fire UMC.

I once fired an old box of Kleenbore and saw the same yellow flake things, it's am mystery to me but these flakes could easily jam a revolver up if they got under the star.

That's why the defense ammo is so expensive, they use clean burning powder that won't gunk up your gun, unlike the reloaded "range and practice" ammo like A-Merc that uses the cheapest crap powder they can find.

Rover

A number of years ago seems I recall Massad Ayoob mentioned somewhere there was a fix some gunsmith did to help prevent the problem by milling under the ejector star or something. The person may have been Rick Devoid of Tarnhelm as he has a familiarity with Rugers.