ought6plinker
Member
- Joined
- Oct 18, 2008
- Messages
- 10
Hello Im trying to figure out burn rates and thermal stability of different current and surplus powders for over bore cartridges like 30-378 w/220+, 257stw etc. wc872 is a ball powder like very near old h870, aa8700 is a slightly faster ball powder? with us869 between those? 5010 I think is a stick powder(does that make it less heat sensitive?) and is h5010 better then imr5010? as far as i know50bmg is the only"extreme type" powder after retumbo but where does it and 5010 stand in burnrate compared to us869,872and8700??anyone have data using overbore stuff in 30"ish barrels with 5010 or 50bmg ,or comments on how they act so that my little mind can compare to my other data?? any info on wc860 or wc868?? ten question marks latter(sorry) I think kirby said he had powder bridging issues with 50bmg in the 257AM but retumbo was good in 257stw!so the question there is does a sharper shoulder 40vs25 make bridging problems worse?? whoa ok Im done Thanks