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The Range
Ammo & Reloading
38 Reloading Data Question
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<blockquote data-quote="Shadowrider" data-source="post: 821821" data-attributes="member: 3099"><p>A 158 gr JHP from Sierra and a 158 XTP HP. One would think that you could load both bullets interchangeably with the exact same data. And one would be wrong. Actually you can as long as you are not at the top end of the data for the caliber you're shooting. The two bullets while weighing the same, will have different bearing lengths in the bore and the one with the longer bearing length (increased friction) is going to have a higher pressure. <span style="color: DarkRed">ETA: ---> This doesn't even address the variable of different case capacity from the differing bearing lengths.</span></p><p></p><p>FWIW, I've always approached reloading as custom tuning a load for you only. So in essense the manuals are only a "suggestion", or a starting point so to speak. Now if you are loading for multiple guns, you can throw this mentality out the window. Follow the manuals. But if you are down from a max load you shouldn't have any problems and even if you do, you'll not likely 'splode your gun or anything. Just another reason not to skirt the ragged edge, it makes things simpler!</p><p></p><p>With all this said I can also say that I've loaded up max loads strictly by the book and not had a single problem in any gun I've shot them in which leads me to believe that the data in the manuals are a bit conservative.</p></blockquote><p></p>
[QUOTE="Shadowrider, post: 821821, member: 3099"] A 158 gr JHP from Sierra and a 158 XTP HP. One would think that you could load both bullets interchangeably with the exact same data. And one would be wrong. Actually you can as long as you are not at the top end of the data for the caliber you're shooting. The two bullets while weighing the same, will have different bearing lengths in the bore and the one with the longer bearing length (increased friction) is going to have a higher pressure. [COLOR="DarkRed"]ETA: ---> This doesn't even address the variable of different case capacity from the differing bearing lengths.[/COLOR] FWIW, I've always approached reloading as custom tuning a load for you only. So in essense the manuals are only a "suggestion", or a starting point so to speak. Now if you are loading for multiple guns, you can throw this mentality out the window. Follow the manuals. But if you are down from a max load you shouldn't have any problems and even if you do, you'll not likely 'splode your gun or anything. Just another reason not to skirt the ragged edge, it makes things simpler! With all this said I can also say that I've loaded up max loads strictly by the book and not had a single problem in any gun I've shot them in which leads me to believe that the data in the manuals are a bit conservative. [/QUOTE]
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