Press.problems .357 mag

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Swifty

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I recently bought a S & W 686 in .357 mag and have begun load development.My first load was 16.5 gr. H 110 ,140 gr. JHP XTP and Wspm primers.Even though this load is reduced it still flattened the primers so i reduced to min. in the Hornady manual of 15.7 grs of H 110 and it still flattened the primers.I bought a factory box of American Eagles in 158 gr.which was o.k. and the primers look good ??.What's the scoop is it the H110,Mag primers,bullets i'am at a lose to explain it.By the way the brass was trimmed to proper lenghth and the crimp wasn't that much so i have no idea whats wrong.Any help would be great.
 
Try some different primers, CCI's maybe. Perhaps your H110 just doesn't like your 686. I've got a gun that doesn't like red dot.....
 
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Throw one of your bullets on your scale to reconfirm that 140gr. bullet weight. Things have been mislabeled before. 15.6 is max if they're 158-160. Verify your scale as well if you have not already done so. Then try another primer. Good luck.
 
With the 686 S&W magnum, you have to watch the Hammer Spring tension. If there's not enough, your primers will pop the hammer back and what should have been a dent will look like an "outie" belly button.
 
I have ceased using Win primers in magnum loads if they are the "new" brass colored type. The cup is too soft and flattens out quickly when even a little pressure is applied. Get some Federals and try them and see if the same signs appear. That should give you some insight.
Carry on!
 
HOWDY; It could be the gun.
I had a Ruger secuirty six 357 with hot loads were OK. a guy at the range wanted to try them in his Smith wesson 357 so . IT locked the cylinder as the primer flowed back into the fireing pin hole.
Not all guns are created equal some will not take a certin load due to ?????
 
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