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Rifles, Reloading, Optics, Equipment
Reloading
Shoulder bump question 30 Nosler
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<blockquote data-quote="J E Custom" data-source="post: 1201040" data-attributes="member: 2736"><p>With brass being so hard to come buy these days, I avoid shoulder bumping as long as I can. (Less working of the brass, means longer life).</p><p></p><p>I have all of the gauges to measure the case length and use them, but I prefer to let the chamber tell me what needs to be done.</p><p></p><p>Minimum sizing to be done is to Neck size only. This works on precision chambers and extends brass life to its max.</p><p></p><p>Bumping the shoulder is only required when the loaded cartridge is difficult to chamber. I bump only enough to make chambering possible without forcing the bolt down (I want to feel the round and be able to close the bolt with no slack/head space between the bolt and the round. A full length die can be used for this if set shallow and get you just enough bump to work.</p><p></p><p>Dies that are made to adjust from zero sizing to small base sizing Like Hornady New Dimension dies</p><p>work well because they can be adjuster to get any fit you want (Normally sizes more than full length for tight chamber or gas guns where cases are sized below normal to aid in feeding)</p><p></p><p>I never bump my cases more than necessary (Normally .0005 to .001) because every time you fire the case it expands back to the chamber size and the process starts over again. All chambers are slightly different and require different sizing amounts, so adjust according to your chamber needs</p><p>and not some number below the SAMME dimensions. </p><p></p><p>Even if you don't have a set of dies that adjust over the standard full length sizing, you can use shims between the shell holder and the case head to get exactly what you want in case fit in your chamber. During the loading process I regularly remove the firing pin and test the first die setting.</p><p>If it feels tight, I add a .0005 shim under the case head and size another case if it needs more I change to a .001 shim and if it feels good I leave it and finish sizing all the rest of by brass.</p><p></p><p>In my opinion this is another example of over doing/thinking a process. Accuracy is based on many things including your ammo quality. the better the ammo fits your chamber the better the accuracy</p><p>can be.</p><p></p><p>My opinion is -Don't bump unless it is necessary and only enough to aid in chambering.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1201040, member: 2736"] With brass being so hard to come buy these days, I avoid shoulder bumping as long as I can. (Less working of the brass, means longer life). I have all of the gauges to measure the case length and use them, but I prefer to let the chamber tell me what needs to be done. Minimum sizing to be done is to Neck size only. This works on precision chambers and extends brass life to its max. Bumping the shoulder is only required when the loaded cartridge is difficult to chamber. I bump only enough to make chambering possible without forcing the bolt down (I want to feel the round and be able to close the bolt with no slack/head space between the bolt and the round. A full length die can be used for this if set shallow and get you just enough bump to work. Dies that are made to adjust from zero sizing to small base sizing Like Hornady New Dimension dies work well because they can be adjuster to get any fit you want (Normally sizes more than full length for tight chamber or gas guns where cases are sized below normal to aid in feeding) I never bump my cases more than necessary (Normally .0005 to .001) because every time you fire the case it expands back to the chamber size and the process starts over again. All chambers are slightly different and require different sizing amounts, so adjust according to your chamber needs and not some number below the SAMME dimensions. Even if you don't have a set of dies that adjust over the standard full length sizing, you can use shims between the shell holder and the case head to get exactly what you want in case fit in your chamber. During the loading process I regularly remove the firing pin and test the first die setting. If it feels tight, I add a .0005 shim under the case head and size another case if it needs more I change to a .001 shim and if it feels good I leave it and finish sizing all the rest of by brass. In my opinion this is another example of over doing/thinking a process. Accuracy is based on many things including your ammo quality. the better the ammo fits your chamber the better the accuracy can be. My opinion is -Don't bump unless it is necessary and only enough to aid in chambering. J E CUSTOM [/QUOTE]
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Shoulder bump question 30 Nosler
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