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Rifles, Reloading, Optics, Equipment
Gunsmithing
300 RUM saami min headspace to datum line?
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<blockquote data-quote="Hookturnr" data-source="post: 638791" data-attributes="member: 22612"><p>Well, I have run this gun from 89.0 gr. of retumbo at .010 off the lands up to 94.0 gr. and didn't see any pressure signs until 93.5. At 94 the bolt lift was sticky. </p><p>I attained my fired case dimension by averaging 12 fired cases from the first batch of 30 rounds that had no extraction issues. </p><p>I'm loading it at 90 grains currently and still having issues. </p><p>My numbers on the fired cases haven't changed over several setups of my caliper with the hornady gauges and repeated measurements so i think I'm good there. </p><p>When I took the .002 off the shellholder I also removed the firing pin from the bolt and chambered about 15 pieces of brass with the new sizing spec and had no resistance when closing the bolt. Seems to me that headspace shouldn't be a possible issue at this point, I'm measuring .004 shorter than fired with my resized brass. </p><p>I'm going to take a shot in the dark and put a new extractor in it and see if that alleviates the issue. The current extractor has around 1800 rounds on it and looks like it may have a slight twist to it.</p></blockquote><p></p>
[QUOTE="Hookturnr, post: 638791, member: 22612"] Well, I have run this gun from 89.0 gr. of retumbo at .010 off the lands up to 94.0 gr. and didn't see any pressure signs until 93.5. At 94 the bolt lift was sticky. I attained my fired case dimension by averaging 12 fired cases from the first batch of 30 rounds that had no extraction issues. I'm loading it at 90 grains currently and still having issues. My numbers on the fired cases haven't changed over several setups of my caliper with the hornady gauges and repeated measurements so i think I'm good there. When I took the .002 off the shellholder I also removed the firing pin from the bolt and chambered about 15 pieces of brass with the new sizing spec and had no resistance when closing the bolt. Seems to me that headspace shouldn't be a possible issue at this point, I'm measuring .004 shorter than fired with my resized brass. I'm going to take a shot in the dark and put a new extractor in it and see if that alleviates the issue. The current extractor has around 1800 rounds on it and looks like it may have a slight twist to it. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
300 RUM saami min headspace to datum line?
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