Hi,
For what it is worth.
I have been trying different loads for my 6 inch Smith Model 19-5, 1984. Powders, primers, bullets and so on. I am very meticulous when it comes to clean brass and clean firearms. I use to load 2400 quite a bit years ago. Load data has changed over the years and my old data did seem rather hot by todays standards. To make a long story shorter, I finally found a load that I and my Model 19 likes. Very clean cases, primer pockets and firearm. 14.8grs. 2400 powder, cci primers, 140gr. Sierra JHP at 1.586 OAL. All with medium heavy crimp. One of the cleanest burns over many other powders, great accuracy (30 yds. 6 shots less 1") and no signs of pressure problems. Used both magnum and standard primers. I do suspect the magnum primers created more pressure. I also loaded 14grs. 2400 and accuracy dropped at ninety feet. Any feedback appreciated. Thanks.