Hornady 357 data

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[Kokopelli]

You’re right. I just checked my Hornady #7 manual and the loads for 2400 and H110 with a 158 grain jacketed bullet are both less for the carbine than for a pistol. That’s with the same components, OAL, etc.

I don’t know the answer.

[J-cat]

Prolly because the rifle chamber lets the bullet jump less than a revolver.

[J-cat]

And the barrel/cylinder gap vents some of the pressure as well.

[sofbak]

It has everything to do with burn rate, pressure rise rate vs expansion of the volume chamber that burn is occurring in-and length of barrel (i. e. the length of time that all this occurs before the bullet leaves the barrel, and all that high pressure gas gets vented to atmospheric pressure.

Free chamber space/revolver gap venting are not factors.

[the86d]

Lier, I mean lawyer-data... for them to Cover their ARSES, and make sure you load lower than PMC 158GR Semi-jacketed thermo-neuclear velocities.

Try a mid load in your manual, and work your way up, SLOWLY, looking for brass pressure signs. Cross reference the MFR load data, and see where the middle-point is. I always start in the mid-point, myself, never the low-end, although there IS a PANDEMIC going on, and saving powder might be something to consider.

You might end up with a heavier-hitter than factory PMC... as you work it up. A Chrono is your friend, too, although I have yet to Chrono Factory PMC myself, but since I FINALLY got some magnum primers, and a nice powder for magnum charges, WE SHALL SEE...

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I definitely need to pick up a Chrono,. I'm actually using the Hornady xtp 125gr, and not seeing any signs of pressure at 15.5 gr. Cases look perfect, if very dirty. Getting occasional unburnt powder when I fire from a revolver. Folks say that lower weight charges have less complete combustion, so was going to try upping the load to ~16gr, and went to check the book first.

Depending on the source, I'm seeing handgun loads up to almost 18gr, which makes no sense to me. Lyman maxes out the rifle load for that bullet at 17.7 (generating 40k psi, per their handgun data for the same load) which is a pretty significant difference. 17.7 is definitely on the hot side, hotter than I am interested in, but just puzzled by the difference.

Might just load these all light side, do extra cleaning till I run out, then try 110.