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primer system part

I am getting back  into reloading and was setting up my 550 and noticed the primer track bearing is missing from under the primer slide. Is it an upgrade to the 550B or did i loose mine somewhere?

Thanks

This is optional. It's function is to prevent or make up for wear on the frame surface where the primer slide rides. Phone us, we can mail one to you.

You use the same primer slide with either option, and is there any change to the way the primers seat? Thanks for the answer also.

Primer slides are the same with or without the steel shim. Primer seating depth is controlled by feel, and to a lesser extent how tight the shellplate bolt is. With the shellplate bolt correctly set, you should be able to seat a primer up to .005"-.009" below flush.

Thanks for the help and info got the parts i needed and all works well.

 

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