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lastly, do you guys that use b/h209 have the tar like residue? its more of an oily soot not unlike the nasty residue coming out of an old diesel engine between exhaust connections or a leaking turbo.. sort of like a partially burned oil like crap... its not really noticeable at first but after about 10 rounds i notice it building up around the crown of the barrel and if i swab the patch comes out really nasty.
edit add; I saw a few guys comments on other forums that do indicate the problem/solution is you have to use larger loads to prevent the crud build up.
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One of the things I have noticed in three different muzzys that I have set up with BH209 is that low charges of the powder do leave more fouling in the barrel. On my 45 cal guns that seemed to disappear when I got to 70 grains volume of the powder. On the 50 cal that point was about 80 grains volume. This powder likes speed and shoots very good when up around 110 - 120 grains volume.