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Rifles, Reloading, Optics, Equipment
Reloading
Shoulder Bump measurement
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<blockquote data-quote="mtnelkhunter" data-source="post: 2919268" data-attributes="member: 127785"><p>Hello all, I am a new reloader and working on developing my first load in 300WSM for a custom hunting rifle built by black canyon customs. I am using a L.E. Wilson cartridge case gauge and the wheeler method and wanted your input on my findings. </p><p></p><p>If I take a once or twice fired case and measure it in the case gauge I get about 2.111" - these cases will all still close in the bolt without too much resistance (firing pin and ejection plunger removed). Using an RCBS matchmaster FL sizing die if I bump it back such that in the LE Wilson case gauge I get 2.105 and above it's a stiff close - stiffer than not resized at all. If I continue to bump back to 2.102 I get a nice gravity bolt drop. My question - what gives? That's .009" that I am bumping back - my thought is that either the sizing die or the case gauge isn't at the same angle as the chamber and so is perhaps not contacting the middle of the shoulder or some such situation.</p><p></p><p>Am I good to go just bumping back to get that bolt drop and just use the measurement as a guide or should I be concerned and look into either perhaps first a different comparator set up or (hopefully not) a different sizing die?</p><p></p><p>Thanks!</p></blockquote><p></p>
[QUOTE="mtnelkhunter, post: 2919268, member: 127785"] Hello all, I am a new reloader and working on developing my first load in 300WSM for a custom hunting rifle built by black canyon customs. I am using a L.E. Wilson cartridge case gauge and the wheeler method and wanted your input on my findings. If I take a once or twice fired case and measure it in the case gauge I get about 2.111” - these cases will all still close in the bolt without too much resistance (firing pin and ejection plunger removed). Using an RCBS matchmaster FL sizing die if I bump it back such that in the LE Wilson case gauge I get 2.105 and above it’s a stiff close - stiffer than not resized at all. If I continue to bump back to 2.102 I get a nice gravity bolt drop. My question - what gives? That’s .009” that I am bumping back - my thought is that either the sizing die or the case gauge isn’t at the same angle as the chamber and so is perhaps not contacting the middle of the shoulder or some such situation. Am I good to go just bumping back to get that bolt drop and just use the measurement as a guide or should I be concerned and look into either perhaps first a different comparator set up or (hopefully not) a different sizing die? Thanks! [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Shoulder Bump measurement
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