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Tennessee Gun Owners Forums
Reloading
300 WM components
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<blockquote data-quote="DaveB" data-source="post: 5421752" data-attributes="member: 5958"><p>I own 2 300 WinMags and 1 300 WSM. </p><p></p><p>I am a big fan of IMR7828 not the short cut. And Federal 215 and 215M primers. Use Imperial wax. There is a happy spot between too much and not enough. Experiment and find it and do not do not do not forget it. You have a (accurate repeatable) micrometer yes? </p><p></p><p>Be very careful when adjusting the FL sizing die. Belted magnums headspace from the belt. There is a common tendency when sizing the brass to not get the last 1/8th inch above the belt back into spec. This bulge will manifest itself by refusing to chamber. You then have a loaded round you cannot use. There is a tool you can acquire...check the Redding die. USE the micrometer. </p><p></p><p>Your best tool is you. </p><p></p><p>FL size ONE piece of brass and then attempt to chamber it-including closing the bolt. Remember, there should be near zero effort on your part. If you do not get it right the first try, set that brass aside and get an un-sized piece. Adjust the die and remember you can crush the shoulder in a heartbeat so that happy point of wax is important. Size the brass, test fit. </p><p></p><p>If it is good---you will know---Load up that piece of brass with a starting point powder charge and off to the range. Fire the round. Using minimal exertion on your part work the action and eject the brass. If you cannot lift the bolt or it requires too much effort, back to the die. </p><p></p><p>Yes, this is painfully slow. Its because adjusting that die is putting more of the body into the die which leaves less room for shoulder and neck. Its why all your brass should be within SAAMI length specs. BTW I use only RCBS dies.</p></blockquote><p></p>
[QUOTE="DaveB, post: 5421752, member: 5958"] I own 2 300 WinMags and 1 300 WSM. I am a big fan of IMR7828 not the short cut. And Federal 215 and 215M primers. Use Imperial wax. There is a happy spot between too much and not enough. Experiment and find it and do not do not do not forget it. You have a (accurate repeatable) micrometer yes? Be very careful when adjusting the FL sizing die. Belted magnums headspace from the belt. There is a common tendency when sizing the brass to not get the last 1/8th inch above the belt back into spec. This bulge will manifest itself by refusing to chamber. You then have a loaded round you cannot use. There is a tool you can acquire...check the Redding die. USE the micrometer. Your best tool is you. FL size ONE piece of brass and then attempt to chamber it-including closing the bolt. Remember, there should be near zero effort on your part. If you do not get it right the first try, set that brass aside and get an un-sized piece. Adjust the die and remember you can crush the shoulder in a heartbeat so that happy point of wax is important. Size the brass, test fit. If it is good---you will know---Load up that piece of brass with a starting point powder charge and off to the range. Fire the round. Using minimal exertion on your part work the action and eject the brass. If you cannot lift the bolt or it requires too much effort, back to the die. Yes, this is painfully slow. Its because adjusting that die is putting more of the body into the die which leaves less room for shoulder and neck. Its why all your brass should be within SAAMI length specs. BTW I use only RCBS dies. [/QUOTE]
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