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Old April 25, 2005, 07:49 AM   #5
Ruger4570
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Join Date: April 3, 2005
Location: Rochester, New York
Posts: 2,136
I tend to agree with cheygriz on the problem of not getting enough pressure to expand the necks,,, but,, you are within a couple of grains of a max charge of 4064 also. Therefore it does seem strange to some degree, your neck expansion isn't over the top, but is somewhat larger than my 308. I tend to get case mouth blackining mostly when I use boat tail bullets. I have assumed that the bullet releases and some of the gasses slip back past the boat tail before the case mouth has had time to fully expand. It really isnt a problem and will do no harm, just a little unsightly. I have seen many guns do this to some degree with no ill effect.
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