I guess what I'm looking for then, is a load using 2400 to create the 200 gr. Super Police load for .38 Spl. My question is what bullets do you all use, and can it be made with 2400?
Thanks
Still the wrong bullet! The closest mould for the correct bullet is Lyman 358430 which, I believe, is still available in the 195 gr. version. At one time there was also a 150 gr version, one band shorter. Cast very soft it will weigh about 198-199 gr.
To replicate the factory .38 Spl. "Super Police" velocity use 3.7-3.9 gr. Unique. 2400 will work, but not the most efficient.
Don't make the mistake of believing there is anything "Super" about the Super Police load. I have two boxes which I have chronographed at different times. The first, 1960s, was shot in a 1915+/- 5" M&P and gave an average velocity of 635 fps on one date and 621 fps on another. 5 round sample both times. The more recent lot which I just obtained is from sometime in the 1980s I believe. In a 6" 10-4 it gave an average velocity of 684 fps, again for a 5 round sample.
Sample size. While at least 20 rounds are needed for a reasonably close average velocity, 5 is sufficient for a good indication/approximation which is really all that is needed. Second, with something so difficult to come by you don't want to just shoot it up for curiosity!
Added:
Factory claimed velocity for the Super Police, from my early box of ammunition was 730 fps, and from the 1944 Gun Digest 745 fps. My experience in chronographing thousands of rounds of factory ammunition is that it is virtually universal that, when shot in real guns, that velocities run 50-100 fps slower, sometimes more, than their book figures indicate. So, what I have recorded for these two lots of ammunition is right in the ball park for what can be expected.
Here is some data from an older Alliant manual dated (C)1996. All are their listed maximum loads, and are for both standard and +P as noted. With this heavy bullet pressures get to +P level real fast! All were shot in a 5.6" test barrel, Federal 100 primers, case not specified.
200 gr LRN Standard: Bullseye, 3.0/760; Unique, 3.6/780; 2400, 7.0/870
200 gr LRN +P: Bullseye, 3.3/795; Unique, 3.7/800; 2400, 7.1/890
I generally rely on Alliant data and have found that generally I get ca. 100 fps lower velocity from a 6" revolver than what is indicated in the manual, just like my experience with factory loads. Note: These were carefully checked and with Unique and 2400 the difference from standard pressure to +P was just .1 gr. of powder for a mere 20 fps.
If you are interested, here is a link to the Lyman bullet mentioned:
http://www.lymanproducts.com/lyman/bullet-casting/mould-details.php?entryID=14