Hello, I am new to the forum. I have a 500 S&W Performance Center gun. I sent it back to S&W because of a timing issue, when it came back the paperwork stated "primer flow". Ever since I have been having occassional problems with lite primer hits when using large rifle primers. My uncle just bought a new 500 S&W with the 4" bbl and has had the same problem? Is there a fix for this, or are there primers that should be avoided when loading for this gun? Thanks

Here's a listing for the S&W .500 loading.
Hope this helps.
500 S&W Magnum Load Data - Handloads.Com



Ernie

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S&W .500 Magnums RULE !

First and foremost whenever you get light strikes is to check the strain screw and make sure it is fully tightened. 99% of the time with light strike it's the strain screw.

To check it: remove the grips. You should see a screw on the front side bottom of the grip portion of the frame, tighten it all the way. If it is loose you will probably notice a heavier DA trigger pull as a result. Often times people think the strain screw is a "trigger pull adjustment screw" it is not, it must always be fully seated.

This is a good point, and valid for the .500 because I bought a 6.5"bbl M500 and the strain screw was backed out about two turns.

The strange thing was my new 686 was the same exact way. After confirming here on this great forum, I promptly tightened both screws and have never had a problem with primer strikes on either gun

Thanks for the responses. I removed the grip and found the strain screw had backed out a full 2 turns!!. I used a little blue loctite and tightened it. Took it to the range today and did not have even one lite primer hit. I used 3 different mfg of large rifle primers including the suspect TULA primers. All had excellent depressions and great ignition. Thanks again for the great responses, I had no idea what the heck a srtain screw was nor did I realize what a loose one can cause.