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Rifles, Reloading, Optics, Equipment
Reloading
Experiences with high overbore cartridges and powder bridging
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<blockquote data-quote="azsugarbear" data-source="post: 2045045" data-attributes="member: 4809"><p>I had a 277 AM built by Kirby that I shot for many years. He warned me the the case volume of the 338 Lapua combined with the smaller 277 diameter neck could/would be prone to bridging. He recommended the ball powders to avoid that potential problem.</p><p></p><p>I did experiment with some Retumbo in the 277 AM once, It performed well until I worked up towards maximum velocities. I then started experiencing erratic pressures and velocities. I figured it was the bridging Kirby spoke of. Scared me to death. I went back to the ball powders and never had any more problems.</p><p></p><p>It is interesting to note that his larger caliber Allen Magnum cartridges based on the same 338 Lapua case did not experience the same bridging problems with stick powders as the 277. The conclusion was that the larger diameter necks were just large enough to avoid the bridging/bottleneck problem found in the 277 AM.</p></blockquote><p></p>
[QUOTE="azsugarbear, post: 2045045, member: 4809"] I had a 277 AM built by Kirby that I shot for many years. He warned me the the case volume of the 338 Lapua combined with the smaller 277 diameter neck could/would be prone to bridging. He recommended the ball powders to avoid that potential problem. I did experiment with some Retumbo in the 277 AM once, It performed well until I worked up towards maximum velocities. I then started experiencing erratic pressures and velocities. I figured it was the bridging Kirby spoke of. Scared me to death. I went back to the ball powders and never had any more problems. It is interesting to note that his larger caliber Allen Magnum cartridges based on the same 338 Lapua case did not experience the same bridging problems with stick powders as the 277. The conclusion was that the larger diameter necks were just large enough to avoid the bridging/bottleneck problem found in the 277 AM. [/QUOTE]
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Experiences with high overbore cartridges and powder bridging
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