Different types of powder leave different amounts of residue. RST selects their powders for reliable ignition in cold weather while still retaining almost unheard of low pressures. I don't think any other shell manufacturer loads shells with the low pressures of the RST shells. The exact pressure level is available with a phone call. Residue is not a direct result of incomplete ignition, more likely just the type of powder being used and the material used to coat the powder itself. The exact pressure will not be printed on the box because of changing figures for individual lots. I would push a Tornado brush through the bore before final cleaning with solvent and patch. In my opinion, no other maker of shotshells is making a low pressure shell that will pass the freezer test that I gave the lowest pressure RST shells several years ago. Personally, I will not be looking for another brand of shell because of powder fouling of the RST shells.
|