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Rifles, Reloading, Optics, Equipment
Reloading
Crimping Belted Magnum Loads… to do or not to do?
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<blockquote data-quote="J E Custom" data-source="post: 1205506" data-attributes="member: 2736"><p>No Problem, I don't know anyone that has done it all, I have lots of experience with crimping on the big bores and an assortment of smaller calibers but there are still many cartridges that I haven't crimped so with all of the variables in cartridges and uses plus the new powders there is still lots of room for experimenting with different methods.</p><p></p><p>With match grade bullets, rarely do they have cannelure's so I have always used a tighter bushing</p><p>in my dies to get the same effect without possibly deforming the bullet (Just Me).</p><p></p><p>The big bores I have tested/chronographed showed some improvement in SDs but at the distance used (100 to 400 yards) I could not see any measurable improvement is accuracy. My 338 went from 11 ft/sec to 6ft/sec SDs with the 250 grain bullet. And my 416 went from 7 ft/sec SDs to 3 ft/sec SDs with 400 grain bullets. I also had a & STW benefit with the 160 grain bullets from an average of 9 ft/sec SDs to 4 ft/sec SDs. These were the most noticeable benefits of crimping.</p><p></p><p>The accuracy did improve on the 7 MMs to the 338s at long ranges (600 to 1000 yards). this could have been because the SDs were better or powder burn was better because of the crimp. </p><p></p><p>I have also improved accuracy by adding more neck tension on some non- cannelured bullets</p><p>But could not prove if it was because of powder burn rates were better or the improved SDs</p><p>were the trick.</p><p></p><p>Either Way, If I can improve accuracy, I will try any method that shows results. So I don't rule out anything because there are so many variables in loading quality ammo.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1205506, member: 2736"] No Problem, I don't know anyone that has done it all, I have lots of experience with crimping on the big bores and an assortment of smaller calibers but there are still many cartridges that I haven't crimped so with all of the variables in cartridges and uses plus the new powders there is still lots of room for experimenting with different methods. With match grade bullets, rarely do they have cannelure's so I have always used a tighter bushing in my dies to get the same effect without possibly deforming the bullet (Just Me). The big bores I have tested/chronographed showed some improvement in SDs but at the distance used (100 to 400 yards) I could not see any measurable improvement is accuracy. My 338 went from 11 ft/sec to 6ft/sec SDs with the 250 grain bullet. And my 416 went from 7 ft/sec SDs to 3 ft/sec SDs with 400 grain bullets. I also had a & STW benefit with the 160 grain bullets from an average of 9 ft/sec SDs to 4 ft/sec SDs. These were the most noticeable benefits of crimping. The accuracy did improve on the 7 MMs to the 338s at long ranges (600 to 1000 yards). this could have been because the SDs were better or powder burn was better because of the crimp. I have also improved accuracy by adding more neck tension on some non- cannelured bullets But could not prove if it was because of powder burn rates were better or the improved SDs were the trick. Either Way, If I can improve accuracy, I will try any method that shows results. So I don't rule out anything because there are so many variables in loading quality ammo. J E CUSTOM [/QUOTE]
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Crimping Belted Magnum Loads… to do or not to do?
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