Remington's Ultimate Muzzleloader Ignition Source features a U.M.L. ignition system, which uses a unique brass case with a Remington 9-1/2 large magnum rifle primer to completely seal the flash hole. This allows the shooter to load up to 200-gr. of powder for increased range, energy and accuracy. For use with the Remington Model 700 Ultimate Muzzleloader only. I believe saddlesore is confusing it with Remington® Kleanbore® Muzzleloading 209 Primers. These are 209 sized primers that have a lower amount of priming compound then 209 shotgun primers. They were developed for blackpowder substitute pellets (777, pyrodex, etc.). The theory is that a shotgun 209 primer when fired behind a pellet can push the bullet up the bore a bit before the pellets are ignited. Not only will this increase fouling (crud ring) but it also causes inconsistent ignition due to a variable sized space behind the bullet prior to ignition.This can affect accuracy. Western Powder specifically recommends against using the muzzleloader primers with Blackhorn 209.
Yep, my bad. Hard to keep up with all this new techy stuff
