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Yes, HM, JeffG suggested possible internal interference so I ckd that and not the prob.
At this point I'm leaning toward case mouth thickness variables as the source, but I hafta get to the range...

UPDATE -
Turns out all is not so well - more loading shows variation is still too much to suit me.
Shimming the turret disk to take out play didn't help.
I'm loading mixed brass and neck...

I filled the stem cavity with epoxy as tazman suggested with OAL +/- .003" on 10 test rounds so I'll call that good enough.
I use a Lee turret press which has some play in the disk fit so I suspect...

I hand prime and load in stages with separate crimp.
I'll try the flat-end plug and post results later today.
Thanks for the interest and help, guys!

Sized to .357.
Excellent suggestions fellows.
I'll check for interference and, if that's not it, I suspect the flat plug will do it.
Tomorrow will tell the tale.
Thanks!

RCBS Lubri-sizer and Lee Alox, tazman.
I've cleaned the seating stem to be sure buildup wasn't the prob and after posting above, went out to the shop, loaded another 35 rounds and 10 of 'em came out...

I've used Lee molds and dies for decades with no problems I didn't create myself.
This combo is driving me nuts.
I set seating depth and OAL can vary nearly .010" +/-.
Roughly 1/4 of my loads have...

M&P 9c
Lee 358-125-RF air-cooled, sized .357
5.5 AA #5
CCI 500 primer
1.070" OAL
1006 fps Inst. @ 15 '.

Tnx for the reply, Denny.
More research, head scratching and checking and seems it's just dumb*ssitude on my part.
Turns out my barrel will accept 1.065" OAL with this bullet, I just wasn't fully...

I'm getting great accuracy, sized .357" over 4.3 gr Bullseye and 1.095" OAL.
Problem is the nose sticks in the rifling, with an occasional FTC. A tap on the slide rear takes care of it though.
My...

Will do, Bigslug. I can go to a harder alloy then the .38 sizer if needed.

Thanks for the info, Bigslug, that helps a lot.
I'm happy to report that the Evapo-Rust worked like magic on the blocks and with my alloy they run about 158.5 gr.
A dummy round loads just fine from...

Thanks, guys.
I have to derust the mold before I can do any casting, so a run to the Auto parts store for some Evapo-Rust tomorrow.

Thanks, Larry, that'll get me going. :Fire:

I just rediscovered a forgotten about (no longer load .38/.357) 358477 4-cavity mold.
Does anyone have experience with and load suggestions for this bullet in 9mm?
I want to try 'em in my M&P 9c....

Many thanks, Nueces - you win the virtual cigar!!
Just took my Lyman .44 die apart and it's the long sleeve for it.
And thanks again to all who took the time to try and help.
Oddly, I've had the...

Yes, 2nd pic is threaded end.
Lee's a good prospect but I don't find any measure part that looks like this one.

I've never owned a Dillon measure, Kevin, so I don't think so either.
But thanks for the reply.

No Jones die.
Maybe these pix will help.

Blued, yes, but I'm confident it's not that, Ace.

OK, thanks Fred - leaves only a few thousand other possibilities. :D

Could be, Fred, but I've never owned a 55.

Sorting my no-longer used die sets for eBay, I found this orphan part that I can't place.
Does anyone recognize it? Maybe a seater stem?
1 3/4" long, nom. 1/2" OD, 2nd pic shows threaded end, 3rd...

To match the chamber according to texasMac's book - 2.125 in the Brownings. :-)

Welcome nwellons; glad to be of help.
Usta live in SE Atl, early '70s.

I've always been big on "do it now, cheep & easy". : -)

regards,