I just came back from the range today after converting my Remington over to 209 primers. This rifle was extremely accurate prior to changing it over. This was my second trip to the range since converting and I still cannot shoot any kind of a group. The bolt was hard to operate after a few shots and was totally filthy. From reading this thread I believe my problem is the 209 primer. I wasn't cleaning after every shot because it wasn't necessary in the past. Looks like I will be going back to musket caps.

I swab with a "spit-patch" between shots. Although there IS a crud ring that is rifle dependent, I find it easy to live with. Omegas seem to be the more "crud ring" likely while the Knights less of a problem. I have also had a problem of the Remington 209-4 primers failing to ignite the powder charge, mostly with 777 pellets.

The Omega was originally shipped with a flat faced breechplug as T/C thought most people would be shooting Pyrodex pellets. The flat face was to keep the pellets for being crushed. Problem was with loose powder and expecially with loose 777 it also helped to make the "crud ring". I find the comment that the 410 primers would not set off a charge difficult to understand as they are still have a lot more energy than a precussion cap or a rifle primer and I have never had either fail to set off the charge. I am in Arizona and we don't usually have a lot of wet weather however which may help explain why no misfires. By the way the Omega is now shipped with a breechplug with a concaved face (or so I have been told). I have a couple for my Omega with the concave face and it is an improvement expecially with loose powder. The 25ACP conversion is another step up also. Contact with T/C indicates that they have not evaluated this conversion.