Stxhunter, I shoot a 357 in a 10 barrel at targets only.
Since hunters and target shooters ,need accuracy, Ive done a good bit of experimenting different heads,powders and over all length in reloading quest for the most accurate 357. This is what I have come up with so far.
Contender 357 mag barrels have a large amount of leade, this is the area from the tip of the case to where the forceing cone takes control of the bullet head.
Useing standard 357 mag ammo measures 1.590 length and accuracy @50 yards was about 2 inches for a 5 shot group. This wasnt what I was expecting from a contender, so I started walking the bullet heads outwards or lengthening the over all length of the assembled cartridge.
I noticed that the accuracy increased a lot the longer I made it,till I went too far, then it fell off again.
My best groups from my barrel (So far,still working) have been 3/4 inch @50 using 5 shots. This is what I use.
2400 powder,11.5 grains
CCI mag primers
Berry's 158 grain plated heads and taper crimped.
1.610-1.630 over all length.
Your results might vary, hope this help deciding what to do.
Forgot to mention, I been working on some lead heads some folks have been making for me in the 160 grain range. Same above loading but groups increased to 1.5 inches.