I have a new one of these rifles and the 6 groove Ballard rifling looks great. I normally cast the Lee 255 and 300 grain RNFP boolits for my Blackhawk. My question is how fast do I need to push these boolits to achieve stability with the 1:38 twist barrel? I tumble lube with 45-45-10. Thank you for any input. I have Unique, 2400, HS-6 and Win 296 powders. GF