little 300winmag reloading help - The Outdoor Community
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post #1 of 3 (permalink) Old 12-13-2013, 07:05 PM Thread Starter
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little 300winmag reloading help

I have reloaded for years .06, 270, 308 but never a belted mag. I had bought a couple of boxes of factory loads and was given 5 or so boxes of once fired from a friend. I had decided to start reloading the 300 full length resized the brass trimmed to size deburred the neck primed and loaded with 68 grains 4350 now the problem right at the base of the shoulder I have a ledge. I don't know what I am doing wrong beveled the neck a little more and still the same UGH......... I am loading with 165 accu-bonds any help would be greatly appreciated!

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post #2 of 3 (permalink) Old 12-13-2013, 07:44 PM
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Re: little 300winmag reloading help

You need to adjust your sizing die...Belted magnums can headspace on the belt or shoulder, depending upon how you adjust your sizing die....

Back your sizing die off until the fired case enters the die with no resistance (not being sized). Then screw down the sizing die until the sized case enters your rifle's chamber with little to no resistance when the bolt is closed. Lock your sizing die....

Or you can get a neck sizing die and a body die. An extra step but you only need to use the body die when sized cases become difficult to chamber....These dies do not require lube on the case exterior which makes for a cleaner operation...
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post #3 of 3 (permalink) Old 12-13-2013, 07:45 PM
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Re: little 300winmag reloading help

Sounds like you have your seating die set down to far. The only thing that can come in contact with the case when seating the bullet is the bullet and the die. Set the case in the ram, raise the ram, turn the seating die down until you touch the case. Back it out 1 full turn. You should be good.

Other possible option is that the fire cases are out of spec and need the shoulder bumped back.
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