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Rifles, Reloading, Optics, Equipment
Reloading
300 RUM load development questions
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<blockquote data-quote="MontanaRifleman" data-source="post: 748245" data-attributes="member: 11717"><p>That's a very good idea. Nothing like seeing it yourself. It makes a bigger impression. FWIW, i just recently FL sized some fired 22-250 brass, fired 25-06 brass and some new 300 RUM brass. I took a handful of each and put them on my Sinclair gauge and the necks ran about 1 - 2 thou of runout. This was with standard New Dimension FL dies for the 22-250 and 25-06 and a standard Redding FL die for the RUM brass. These all size the neck about 5-6 thou smaller than the expander diameter. If you lube the inside of the neck and go slow, you can do a good job of keeping them straight. I didn't measure the runout of these cases prior to sizing, but usually they are just under 1 thou give or take.</p><p></p><p>One thing about using the expander with the bushing is you don't have to turn the necks. If you use a bushing only, it's best to turn the necks. If you're using a factory barrel, there is really no point in neck turning. Your neck space is already going to be generous and thinner necks will expand all the more.</p><p></p><p>Something else you might experiment on is sorting your loaded cartridges by run out and shooting them to see how much if any difference there is.</p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 748245, member: 11717"] That's a very good idea. Nothing like seeing it yourself. It makes a bigger impression. FWIW, i just recently FL sized some fired 22-250 brass, fired 25-06 brass and some new 300 RUM brass. I took a handful of each and put them on my Sinclair gauge and the necks ran about 1 - 2 thou of runout. This was with standard New Dimension FL dies for the 22-250 and 25-06 and a standard Redding FL die for the RUM brass. These all size the neck about 5-6 thou smaller than the expander diameter. If you lube the inside of the neck and go slow, you can do a good job of keeping them straight. I didn't measure the runout of these cases prior to sizing, but usually they are just under 1 thou give or take. One thing about using the expander with the bushing is you don't have to turn the necks. If you use a bushing only, it's best to turn the necks. If you're using a factory barrel, there is really no point in neck turning. Your neck space is already going to be generous and thinner necks will expand all the more. Something else you might experiment on is sorting your loaded cartridges by run out and shooting them to see how much if any difference there is. [/QUOTE]
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300 RUM load development questions
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