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Long Range Hunting & Shooting
338 Edge/ABS break in/development.
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<blockquote data-quote="Michael Eichele" data-source="post: 293256" data-attributes="member: 1007"><p>With cases this big, it has been my experience that it doesnt take much lot to lot varience, chamber demension differences or throat differences to make HUGE changes in velocity from one rifle/load to the next.</p><p></p><p>When one guy uses X grains of X powder, and another uses the exact same load and they get 2 totally different velocities, the lot of powder used, chamber dimensions, throat length, how far into or off the lands their running makes a HUGE difference in velocity. Hence the reason equal velocities arent always found with the same powder charges. </p><p></p><p>I guarantee you guys that with my short throat and tight chamber, if I were to run 92-94 grains of H1000 under the 300 SMK, I would be in serious trouble. Now if I lengthend the throat and increased case capacity by seating the bullets further out, I would be in buisness.</p><p></p><p>Hence the statement in every reloading manual. Start low and work up. It doesnt seem to be near as critical nor as dangerous with smaller calibers such as the 308 winnie and such but the bigger mags are very tempermental and show there tempers when little things are different.</p></blockquote><p></p>
[QUOTE="Michael Eichele, post: 293256, member: 1007"] With cases this big, it has been my experience that it doesnt take much lot to lot varience, chamber demension differences or throat differences to make HUGE changes in velocity from one rifle/load to the next. When one guy uses X grains of X powder, and another uses the exact same load and they get 2 totally different velocities, the lot of powder used, chamber dimensions, throat length, how far into or off the lands their running makes a HUGE difference in velocity. Hence the reason equal velocities arent always found with the same powder charges. I guarantee you guys that with my short throat and tight chamber, if I were to run 92-94 grains of H1000 under the 300 SMK, I would be in serious trouble. Now if I lengthend the throat and increased case capacity by seating the bullets further out, I would be in buisness. Hence the statement in every reloading manual. Start low and work up. It doesnt seem to be near as critical nor as dangerous with smaller calibers such as the 308 winnie and such but the bigger mags are very tempermental and show there tempers when little things are different. [/QUOTE]
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