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Rifles, Reloading, Optics, Equipment
Reloading
Fireforming Pressures
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<blockquote data-quote="azsugarbear" data-source="post: 750025" data-attributes="member: 4809"><p>The purpose behind using cornmeal to fireform cases is: barrel life. In my case, I was fireforming 277 Allen Magnum cases from 338 Lapua brass. Expected barrel life on the 277 AM is anywhere from 600 to 1000 rounds. Remember, you are sending 90+ grains of burning powder into a .277 funnel at very high pressures. When you are spending $750 on the barrel ($400 for a custom fluted barrel and another $350 on smithing for threading, chambering, crowning and brake indexing), you don't want to spend even 50 rounds fireforming cases with bullets and semi-full to full loads. 10-20 grains of a fast-burning pistol or shotgun powder under cornmeal gets the job done with minimum barrel wear. It's all about barrel life - not the bang in the air.</p></blockquote><p></p>
[QUOTE="azsugarbear, post: 750025, member: 4809"] The purpose behind using cornmeal to fireform cases is: barrel life. In my case, I was fireforming 277 Allen Magnum cases from 338 Lapua brass. Expected barrel life on the 277 AM is anywhere from 600 to 1000 rounds. Remember, you are sending 90+ grains of burning powder into a .277 funnel at very high pressures. When you are spending $750 on the barrel ($400 for a custom fluted barrel and another $350 on smithing for threading, chambering, crowning and brake indexing), you don't want to spend even 50 rounds fireforming cases with bullets and semi-full to full loads. 10-20 grains of a fast-burning pistol or shotgun powder under cornmeal gets the job done with minimum barrel wear. It's all about barrel life - not the bang in the air. [/QUOTE]
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