I too have used MEC 600 JRs extensively. I have three: a 12, 16, & a 20. I have loaded thousands of shells on each of them without ever having any problems of note. I personally have never seen any need to upgrade to better presses. My 600 JR reloads always function flawlessly in all my guns whether they be doubles, pumps, or autoloaders. I will make one recommendation though and that is not to even consider the Lee LOADALL shotshell loader. Normally I am a great fan of LEE products, but that thing is absolutely the biggest piece of junk I have ever used. Fortunately I was able to sell it at one of my wife's yard sales.
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