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Plunger/striker fired inlines are notorious for being dirty rifles. Its a shame that it puts folks off because the are some of the most accurate and dependable rifles out there. No hinge pin tolerances to worry about. No bolt innards to sieze up and full length rammers make loading,swabbing and occasionally pulling a ball less of an adventure.Short rammers make extensions necessary ( ever forget to bring one?) and telescoping rammers can, well, telescope or bend at the worst time.Anyway, I've found these rifles are messiest when using 209 primers as most of the plugs or ignition modules ( like my Black Diamond) have spaces that the 209 doesnt block and this results in ALOT of gasses and other wonderful stuff getting into the breech. If your rifle has a plug threaded for nipples , a standard #11 cap or musket cap will give a noticeable reduction in breech fouling, better accuracy and in the case of my Black Diamond, another 100 fps with the same load.. This has been the case with my Black Diamond XR ( which Cayuga refers to as a " dirty pig"), and my daughters Traditions Tracker 209 which after fracturing the 209 holder on the breech plug, I converted to use musket caps.Using the same load, groups were cut by 1/3rd compared to 209 fired loads. With my Black Diamond, replacing the flamethrower musket nipple with a single port Ampco reduced the breech fouling ( cci 6 petal caps) so that 10 shots give the same breech fouling as 3 rounds did with the flame throwers. Also the regular nipples are easier to find, and far less expensive than breech plugs. Another point about using nipples, swapping out burned out breech plugs can introduce a problem. Differences in the bearing shoulders of the plug and barrel can result in gas cutting and/ or gas leakage into the breech threads.With a plug that uses nipples or has been fired with a vent liner, the mating shoulders get matched up and their ability to seal remains constant.Every time you swap out the whole plug those shoulders have to re-seat.My Omega Z5 used to need a new plug every 350-400 rounds, and after 1600 rounds those barrel sealing surfaces showed viasble erosion.My Diamond needs a new nipple after about the same.But a $6 nipple beats a $20 breech plug. Sooo If your rifle will accept nipples and they will ignite your powder of choice, the old , humble percussion cap might just make your " dirty pig" alittle more user friendly.