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Rifles, Reloading, Optics, Equipment
Reloading
Big 338 powders??
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<blockquote data-quote="Long Time Long Ranger" data-source="post: 460578" data-attributes="member: 505"><p>Just so everyone reading this knows. There is a world of difference between loading the lapua and ultramag cases and loading the really big 338's off the huge 378 wby, 416 Rigby, Excalibur, etc cases. The lapua and ultramag based cartridges perform best with a faster burning powder than the big cases. They just can not hold enough of the slow burning powders that make the big cases shine. For all the 338's I load off the lapua and RUM cases powders with burn rates from around 7828 to Retumbo work best. WMR was the best I used when I was working with various improvements to the Lapua and RUM cases back in the 90's but they quit making it. With powders available now I get best results with powders that have burn rates similar to RE-25, H-1000 and retumbo. </p><p> </p><p>With the huge cases I have got best performance starting with Retumbo on the fast side and going slower. H-870 is the best I have used for the big cases and it outperforms any faster powder by up to 100 fps or more. Problem is they discontinued it. With powders faster than Retumbo I exceed pressure limits before reaching maximum velocity. </p><p> </p><p>Not saying that powders outside the burn rates I listed will not shoot well in your gun. I am saying it is best to work within the burn rates that give optimum performance and top velocities. Then when you hit that perfect load you are getting all the velocity performance you can out of your rifle.</p></blockquote><p></p>
[QUOTE="Long Time Long Ranger, post: 460578, member: 505"] Just so everyone reading this knows. There is a world of difference between loading the lapua and ultramag cases and loading the really big 338's off the huge 378 wby, 416 Rigby, Excalibur, etc cases. The lapua and ultramag based cartridges perform best with a faster burning powder than the big cases. They just can not hold enough of the slow burning powders that make the big cases shine. For all the 338's I load off the lapua and RUM cases powders with burn rates from around 7828 to Retumbo work best. WMR was the best I used when I was working with various improvements to the Lapua and RUM cases back in the 90's but they quit making it. With powders available now I get best results with powders that have burn rates similar to RE-25, H-1000 and retumbo. With the huge cases I have got best performance starting with Retumbo on the fast side and going slower. H-870 is the best I have used for the big cases and it outperforms any faster powder by up to 100 fps or more. Problem is they discontinued it. With powders faster than Retumbo I exceed pressure limits before reaching maximum velocity. Not saying that powders outside the burn rates I listed will not shoot well in your gun. I am saying it is best to work within the burn rates that give optimum performance and top velocities. Then when you hit that perfect load you are getting all the velocity performance you can out of your rifle. [/QUOTE]
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Big 338 powders??
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