Originally Posted by metalhead
More than likely, yes. As a rule of thumb, always back off the powder charge when using different components. CCI, federal, Remington, Winchester, etc all make LR primers but they burn at different temps. Brass varies by thickness, hardness. Bullets vary by design, jacket thickness etc. Any of these will cause a difference in pressure.
Very well said.
Different reloading manuals vary in there data also. Some are very conservative and some are not.
Even with the exact same componants, different rifles will vary in pressure and velocity so it is
always wise to start low and work up.
Note: Manuals from the same source but different published dates will vary due to changes in
powder and philosophy also.
J E CUSTOM