Struggling with .357 WC

[kelbro]

I have some 148grDEWC that shoot lights out in 38Spl cases but I can't get them to shoot worth a flip in my 357 cases. Same pistol (S&W 586).

Tried upping my 38 load by 10% and worked around there.

I found two or three powders that clicked in the 38 cases. Any suggestions for the 357 cases?

I had them seated flush in the 38s. Should I still seat them flush in the 357s?

[lwknight]

If you were seating WCs flush in 38spl which is typical and in your 357 brass are not seated all the way down, you have changed your case capacity by a lot more than 0.100" difference between the 2 cases. The wadcutters may be too clost to the cylinder throat to start with. Even SWC RN FN all do not engage the throat without a jump to it. It is possinle that a WC not deated near flush could act entirely different.

Just for fun and I gotta share this: I loaded 2 grains bullseye with 100 grain WCs in 38 spl. They sound like a loud cap gun and the boolit still gets to the 25 yd targer pretty quick.

[MT Gianni]

I would keep them as they are and clean the chambers after use. I have used 38 & 357 interchangebly in my guns since the 70's without any problems.

[kelbro]

Update. Switching to SPP primers did the trick. My normal 38 loads in the 357 brass worked well as did the 38 loads+ 0.1gr of both the Bullseye and the 700X. Loaded the WCs to the first crimp groove (just a little protruding from the case) and used a light crimp.