so this means i gotta fork over a few bucks for reloading crap. since i'm shooting IDPA, does it make more sense to use 38 brass and just load it hot, or to use 357 brass and water it down? i guess the question is - which case is more versatile and more sensible. i'd probably need to budget having around 250 rounds in total since i can likely burn through 150 or so on a single service day. not sure how many i'd need on a match day, though.....
OK you mentioned IPDA. I am not yet into this game but have been thinking about it. I already have all the gear, except for speedloader pouches. Main reason for the procrastination is that the closest range that runs IDPA is an hour away. If ever they do IDPA at my club which is 15 minutes from my home, I am in for sure.
Back to your question. The Power Factor Floor for Enhanced and Service Revolver is only 125,000. That means you only need to push 158 grain38/357 to 791.14 feet per second. FYI, I only have 6 inch-barreled revolvers and the info that follows relate to that barrel length.
That velocity is within the capability of my regular 38 spl loads of 158 grain heads over 3.7 grains Titegroup or 700X. However, for competition, I would load .1 or .2 grain more, just to make sure I make the PF floor.
As well, in keeping with the spirit of IDPA, I will want to use ammo that best replicates SD ammo and so a little more kick just adds to the fun.
Another thing. The .357 Magnum was developed in the 1930s using .38 special cases in large framed S&W revolvers. .38 spl brass is plenty strong.
I haven`t checked this yet, but some say that wall thickness of .38 and 357 brass is identical.
Furthermore, I regularly load 38 spl to +P or more velocities (4.3-4.4 700X or Titegroup under 158 grn RN or SWC TL bullets). Doesn't seem to hurt the brass. These loads produce 1,000 fps out of my 6 inch GP100 or S&W 686, for a PF of 158,000. The fired brass falls out of my cylinders and primer exhibit no over-pressure signs.
I also have a a substantial amount of 357 brass but have only bothered to load a few hundred to full 357 magnum loads using magnum powder. Never felt the need except to see beautiful fireballs during evening shoots.
357 brass expensive and hard to come by. 38 spl is cheap.
So my recommendation is start with 38 spl. Load high or low to your hearts desire. You can use 38 brass your whole life and will not miss much.
The 38spl crud ring is a non-issue for me. I shoot 500 or more rounds between cleanings and have not experienced .357 brass failures to eject. Maybe it is the higher 38 spl loads I use which completely burn the powder for less residue. YMMV
If you really want to load full or maximum 357 loads, then use 357 brass if that makes you happy.
You can also afford to lose the 38 brass during competitions. I`d hate to leave 357 brass behind.