Anyone have measured velocities 357 Mag, 20" barrel

[TCLouis]

Measured, not book value, or Load program calculated.

Lyman 358156
15.0 grains of Lil Gun
15.0 grains of 2400

Curious folks want to know!

[Artful]

These guys did up to 18"
http://www.ballisticsbytheinch.com/357mag.html

[fecmech]

Can't help with the 15/2400 but I think I can get you in the ballpark. Out of my Rossi 92/20"bbl.
Lee158 rf/13.5/2400=1642fps, Lyman 358429/13.5/2400=1689fps

PS. After chronographing many .357/38sp loads a general rule is fast powders(BE,RD,231 etc) give +200-250fps over pistol bbl. Slow powders(2400,AA9,296 etc)generally 350-400fps over handgun speeds.

[TCLouis]

Thanks Artful.
fecmech, that is about what I was guessing (and hoping for).
358156 and those upper loads are the only combo I have had any success with.
At 50 yards they open a gallon milk jug of water with authority and I can hear the impact.

Unlike your results I have NOT been able to get any sort of precision out of the 358429s in the 92. I have been shooting the group buy version with slightly changed ratio of dimensions so maybe that is it. My Lyman 358429 mold casts boolits at 0.368" and I wish I had not cast 25# before I found out. They should make a good plinker/practice boolit for a 9.3, but I have no such critter They are so pretty I have not been able to bring myself to melt them down. This is cast from an alloy/casting session that produced on spec 358156s.

[Lonegun1894]

My Rossi 92 20” gets 1850 FPS with 15.0grs of 2400 and a Mihec 358156 sized to .360”. A friend tried my loads in his identical rifle and only got 1780 FPS tho, so it definitely varies.

[robg]

16 in trapper 165grgcswc 13.5 g 2400=1530 fps /180 grgcsil 11.5 gr 2400=1250 fps.

[TCLouis]

Thanks one and all.
Looks like it is in the ballpark of what I wanted.
I now have a bunch of time to work on it over the winter/spring.