Difference from Blackhorn 209 and Pyrodex, velocity wise?

[heavybarrel]

Say you are shooting 120gr max charge of Blackhorn 209 and 150Gr Pyrodex?

heavybarrel

[sourdough44]

I tested 120 grns of B209 with a 250 grn SST in my 26" barrelled Knight, 50 cal of course. I got a very low deviation 1950 FPS. My buddy was shooting 120 grains of 'Shockey's Gold', same weight bullet. His average was much slower, below 1600 for sure. He also had VERY wide velocity swings with the few he put through the chrony, +/- 150+ fps. That was the last time he shot that powder.

I've shot deer with Pryodex, yes it works, but it has less energy then 777 or B209. I would expect 150 grains of Pryodex to still be a fair amount below 120 grns of B209.

I plan to chrony some more loads tomorrow, most notably 110 grns of B209 & a 195 grn Barnes out of a 45 cal Knight.

[sabotloader]

Nov 4, 2013 19:40:21 GMT -5 heavybarrel said:

Say you are shooting 120gr max charge of Blackhorn 209 and 150Gr Pyrodex?

heavybarrel

Just a couple of thoughts... Remember that BH is a smokeless progressive burning powder with Black Powder characteristics. It was designed to mimic the best of the real black powders or BP subs in pressure development. The real key is the progressive burning characteristics, while BH DOES develop more total pressure, creating pressure over a greater time period, it basically never creates the peak pressure that BP and BP subs do at a given point in time.

Again, because of it progressive nature, the heavier the bullet you shoot the more efficient the powder is. Shooting lighter projectiles and loading BH grain for grain with Swiss BP or Triple Seven you will not see a great difference in velocity possibly even less velocity. Comparing BH to any of the Pyro's and loading grain for grain you will see a difference of about 10-15% in the increase of velocity.

So back to your question.... 120 grains of BH vs. 150 grains of Pyro... It would be my speculation that you would see about a 10-15% in velocity with bullets up to 250 grains in weight. After 250 grains in weight of the projectile the velocity gap will widen.

This chart might give you some thoughts, but it is a comparison with BH vs. T7 using a lighter 200 grain bullet

[sourdough44]

FWIW 110 grains B209, 195 grn Barnes saboted bullet, 26" 45 cal Knight gave me 2218 avg FPS today. That's my load this year.

[heavybarrel]

I assume it shot good? What sabot?

heavybarrel

[sourdough44]

I just did confirmation shooting at about 70 yrds. I used the supplied sabots. I do have some Harvester crush rib sabots I could of substituted. The Barnes sabots loaded just a little tighter than I prefer, still not impossible though.