I use 14.7 grs. of #2400 with 158-gr. jacketed bullets, Winchester cases and WSP primers in a variety of .357 Magnums which include a 2-3/4" Ruger Speed Six, a 6" Security Six, 18" Marlin 1894SRC and a 24" Marlin Cowboy II Limited. Velocity approximates factory loads, about 1150 in the 2-3/4", 1200 in the 6", 1600 in the 18" carbine and 1700 in the 24" rifle.
A uniform and heavy crimp is necessary for good ignition and complete combustion. Magnum primers are unnecessary and not recommended.
Use the Lee Factory Crimp Die to ensure a positive and firm crimp. I don't have any problems with unburned powder, even with my 2-3/4" as long as I stick to 158-gr. bullets. The Remington and Winchester JHPs expand well from handguns and peform well on small deer under 100 pounds from the rifles at short ranges to 100 yards. The JHP bullets are fairly destructive of meat when used in rifles, so you may want to use JSPs or the Hornady XTPFN bullets for deer in the rifle. The Winchester and Remington JHP bullets expand to .55-.58 in water, even when shot from the 2-3/4" revolver. From rifles the expanded nose blows off and the rear 2/3 of the bullet continues on, expanded to about .52 cal.
The various JSP bullets do not expand AT ALL at handgun velocities, but only flatten the exposed lead on the nose, but they do penetrate deeply.
When fired from a rifle barrel the Remington and Winchester JSP bullets expand in water jugs to about .52-.54" and retain 90%+ of their weight.
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