More Conflicting Data

[Taildragger-J3]

I just read the "Conflicting Data" post and have some of the same issues between a Speer & Sierra manual. BUT now I'm even more puzzled by some info I got straight from Alliant about their Unique powder. I'm reloading for my 44 special & have 240 grain cast bullets (similar to a Keith) and 240 grain JHP. The data from Alliant gives two different amounts of the same powder for the same weight bullet. I've HEARD that cast lead bullets go down the bore with less drag than a jacketed one, Is that why they're suggesting 1.3 grains more powder behind a jacketed bullet than a lead one? I've tended to load very conservatively (using Lee data) with the same powder weight with both cast lead & jacketed bullets and have been very satisfied with the results.

What do y'all think? Should I bump up the powder with the jacketed bullets or just load the 6.3 grains behind both?

 

[rcmodel]

Cast bullets do produce less pressure then jacketed bullets.

Grease lubed lead is slicker then dry copper so there is less bore friction.

As for the difference in charges?
The Speer LSWC is a soft swaged bullet that can't be driven as fast as a cast bullet without leading.

They just stopped at the velocity the soft swaged bullet would stand, not the max pressure allowed in the .44 SPl..

A Keith 250 SWC cast bullet can be driven safely over 1,000 FPS in a modern Colt or S&W .44 Spl.

rc

 

[Walkalong]

As Inspector Clouseau would say, the case is solved. (sol...ved )