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Rifles, Reloading, Optics, Equipment
Reloading
300RUM problems
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<blockquote data-quote="steve smith" data-source="post: 279344" data-attributes="member: 110"><p>Seating die is not adjusted properly. Assuming that your using a standard bullet seating/crimp die. If you have the die to far down, upon seating the bullet the die trys to crimp the case mouth. Sierra matchkings don't have a cannalure for crimping and the result is the brass gets pushed back, bulging the shoulder. </p><p></p><p>Easy fix! Back off 1/8 of a turn on the die.</p><p></p><p>Been there and done that! I accidentally got a few 270win cases mixed in with a whole bunch of 30-06 brass. With the elliptical expander on the die I never noticed the fact that I was necking up to 30cal. Never did trim the brass so when I went to seat bullets the "longer 270win" cases bulged big time at the shoulder.</p></blockquote><p></p>
[QUOTE="steve smith, post: 279344, member: 110"] Seating die is not adjusted properly. Assuming that your using a standard bullet seating/crimp die. If you have the die to far down, upon seating the bullet the die trys to crimp the case mouth. Sierra matchkings don't have a cannalure for crimping and the result is the brass gets pushed back, bulging the shoulder. Easy fix! Back off 1/8 of a turn on the die. Been there and done that! I accidentally got a few 270win cases mixed in with a whole bunch of 30-06 brass. With the elliptical expander on the die I never noticed the fact that I was necking up to 30cal. Never did trim the brass so when I went to seat bullets the "longer 270win" cases bulged big time at the shoulder. [/QUOTE]
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Reloading
300RUM problems
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