Just wondering if anybody has cronied a 357 round loaded with BP or 777 powder? I don't have access to a crony,so I am curious. I load mine with 777, about 21-22 grains by volume, for Cowboy Action Shooting.
Yes, indeed! It is one of the most accurate .357 cartridges I use in my '94 Cowboy Ltd. ;D In fact, I use it most of the time in NRA Cowboy Silhouette shooting.
A few years ago I did some research on the .38 Special black powder cartridge of 1907. I found that it was factory loaded with 21.5 grs of black powder and a 158 gr lead bullet with two grease grooves. Factory ballistics were an impressive 960 f.p.s. in a 6" barrel!
Since I like to relive history I searched for an obsolete Ideal (Lyman) 358250 mold which produced a bullet that replicated the factory b.p. bullet. After some searching, I found that mold and proceeded to load 21.5 grs of SWISS 3F black powder in some early .38 Special balloon head cases that I had.
Chronograped velocity in the Marlin's 24" barrel averaged 1,255 f.p.s. By comparison, 21.5/GOEX 3F went 1,205 f.p.s.
In .357 Magnum brass, the velocity with 21.5 / SWISS 3F was bit slower at 1,215 f.p.s. most likely because of the less compression used.
Hodgdon 777 - .357 Magnum cases 158 gr cast bullet
15.0 grs by weight = 1,134 fps in the 24" barrel. Velocity in a 20" carbine barrel was pretty much the same.
I'm thinking I might have made an error in my above post. I put Pyrodex P by volume, but after thinking about it a bit, I'm thinking that was probably a weighed charge. I do know that I chrono'd it in my brother's Vaquero as I wasn't too keen on getting black powder residue into the action of my rifle. That and he was interested in shooting BP in his pistol. I know I loaded up 6 of them and the first one we just poured Pyrodex in until it came up to enough for the bullet to compress the load a little.
As I didn't keep good notes on how it was measured, I think I'm going to delete that load off of my 357 load sheet in Excel.