When I couldn't get straight info about charge weights of pyrodex, I used Goex 2F Black Powder in a sealed can to charge and weigh an old T C telescoping black powder measure. This is the widely distributed (twenty years ago) measure that has the little ball on the end of the slider, for a leather thong to attach. Here's the weighed black powder and ball weights.
measure Closed; 50.0 grs. of 2F Black Powder, from a sealed Goex can.
1 exposed groove; 60.2 grs. of 2F Black Powder
2 exposed grooves; 82.5 grs. of 2F
3 exposed grooves; 95.5 grs. of 2F
4 exposed grooves; 103.5 grs. of 2F
5 exposed grooves; 116.0 grs. of 2F
6 exposed grooves; 128.0 grs. of 2F
Since my lefty Cabela's Investarms Hawken has a chromed bore, I ordered undersize .520" balls from Hornady. Their .520" ball weighs 211.0 grs.. While the tight .530" ball weighs .220 grains. I squished the two balls in my press so they wouldn't roll around in the dish of my little RCBS powder scale. My fifty four caliber, 28" bbl. has a max. efficiency with 73.6 grs. of powder, per the Davenport formula. So I'm using the measure with three grooves exposed.
The davenport figures for the 58 cal. are 3.038 x bbl. length, and the 62 cal. figures are 3.472 x bbl length.
I hope this bit of measuring helps cut through the volume for volume, circular pyrodex info, considering that not everybody has the orig. black 2F powder to do the comparisons. When Pyrodex was introduced, way back when, just about everyone did have the old black powder on hand, IMHO.
measure Closed; 50.0 grs. of 2F Black Powder, from a sealed Goex can.
1 exposed groove; 60.2 grs. of 2F Black Powder
2 exposed grooves; 82.5 grs. of 2F
3 exposed grooves; 95.5 grs. of 2F
4 exposed grooves; 103.5 grs. of 2F
5 exposed grooves; 116.0 grs. of 2F
6 exposed grooves; 128.0 grs. of 2F
Since my lefty Cabela's Investarms Hawken has a chromed bore, I ordered undersize .520" balls from Hornady. Their .520" ball weighs 211.0 grs.. While the tight .530" ball weighs .220 grains. I squished the two balls in my press so they wouldn't roll around in the dish of my little RCBS powder scale. My fifty four caliber, 28" bbl. has a max. efficiency with 73.6 grs. of powder, per the Davenport formula. So I'm using the measure with three grooves exposed.
The davenport figures for the 58 cal. are 3.038 x bbl. length, and the 62 cal. figures are 3.472 x bbl length.
I hope this bit of measuring helps cut through the volume for volume, circular pyrodex info, considering that not everybody has the orig. black 2F powder to do the comparisons. When Pyrodex was introduced, way back when, just about everyone did have the old black powder on hand, IMHO.