A ML 209 is just a tad hotter than a shotgun 209 but I really can't tell the difference in the two of them other than the price
Incorrect. ML 209 primers are not as hot as standard 209 primers. The theory is that Standard 209 primers can blow through BP and some equivalents (especially pelletized ones like 777 pellets or pyrodex pellets) and start the ball/bullet/sabot forward before the main charge really gets burning. This can cause a similar effect to not quite seating the ball/bullet onto the powder properly. I also find that using ML 209 primers leaves less of a crud ring at the breech when shooting 777 or pyrodex pellets. Even leaves less of a crud ring with loose BP and sub powders. Probably because they aren't as hot. BH209 needs hotter primers.
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Last edited by noelf2; January 3, 2013 at 03:23 PM.