You forgot the Buffalo Bore outdoorsman load. It is a 158 grain hardcast at 1250 fps producing 550 lbs of muzzle energy. I may just start buying nothing but 357 loads for my GP100. I hate paying close to $15/box for something below a 9mm in power. I'll learn to reload someday.
I didn't mention the outdoorsman load because the advertised velocity is from a 6" barrel and there are very few 9mm's with a barrel that long. Basically, I was trying to keep the comparison 'apples to apples'. Also note that the outdoorsman loading produces about the same velocity from a 4" barrel as the LSWCHP loading does.
How do you get that and the loads producing under 300 lbs of muzzle energy from the same cartridge even if one is +P? Not sure how safe that will be to shoot in 38's though. Or maybe its more the ammunition manufacturers that under power the cartridge than it is the round.
Buffalo Bore does a couple of things differently. First, they choose their powders more carefully in order to select those that produce the highest velocity for the given application. Secondly, while SAAMI defines certain pressure limits for most cartridges, manufacturers like Winchester, Remington, Federal, Speer, and Hornady typically keep their max pressures at least a few thousand PSI below the SAAMI limit. Boutique makers like Buffalo Bore, Double Tap, and Grizzly, however, often load their ammunition right up to the ragged edge of SAAMI limits (and in some cases beyond) in order to squeeze every last bit of velocity out of the cartridge.
.38 Special simply has a lot more room for "improvement" than 9mm does due to its extra case capacity. You see, the more case capacity you have the less an increase in powder charge will affect pressure. Also, I suspect that .38 Spl is downloaded even more than 9mm is due to the larger number of old and/or questionable quality revolvers still lurking about.
So long as your revolver is rated for +P ammunition and in good working condition, Buffalo Bore should be perfectly safe to shoot although the recoil might be a bit on the heavy side for some.
I may just start buying nothing but 357 loads for my GP100. I hate paying close to $15/box for something below a 9mm in power. I'll learn to reload someday.
A few years ago, I'd have said that .38 Special was cheap enough not to be worth bothering to reload unless you just particularly enjoy that activity (I still feel that way about 9mm). However, .38's just aren't cheap anymore and .357's have gotten even more expensive. I simply would not be able to afford to practice adequately with several of my guns if I didn't reload (I seem to have a taste for odd and expensive cartridges like .44 Magnum, 10mm Auto, and .38 S&W). The good news is that you can reload both .357 Magnum and .38 Special with one set of dies and some of the same components (I use the same primers and bullets for both .357 Magnum and .38 Special).