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Old Yesterday, 06:44 PM   #26
hounddawg
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CW gives good advice. I tune my load to the range I am shooting at. I have a couple of loads that are accurate at 300 but would fall apart at 600 or 800. Why do I use them at all? Less expensive bullets, less powder used, and less barrel wear for a substantial cost savings per round. Plus you don't have to worry about velocity inconsistency so less testing needed
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Old Today, 02:02 AM   #27
Metal god
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I'm using two sizes of Hornady hollow point boat tail match bullets, both 68 grain and 75 grain. I'm loading them in LC brass that's been sized so the shoulder is "bumped" .003", and neck sized using a Lee collet neck sizer with a .001 undersize mandrel. I'm annealing in between body sizing and neck sizing and all brass is trimmed to the same length
I'm concerned about your method and how little neck tension/bullet hold you have in a auto loader . I'd be worried about bullet set back ( OK not if the load is so compressed the bullet can't be set back ) but .001 is very little hold especially if you're annealing as well . My limited testing with bushing and collet neck dies has shown me that a .001 bullet hold will allow me to manually push the bullet deeper into the case just by pushing the tip into the bench by hand . That IMHO is to little of hold for an auto loader . What I've not done is go shoot those because I don't load my AR loads with less then .003 of hold YMMV .

I actually have a Lee collet die in 308 that is exactly as you describe and I've never fired a round that I loaded using that die because of the poor bullet hold I get with it .

The next thing I'd ask is if you have actually fired these heavily compressed loads . You were likely very close to bulging the case which will cause feeding problems . I load many compressed loads but have never deformed a bullet doing so . If you're deforming bullets , you're likely close to deforming other things as well .

I'm not there seeing what you're seeing so you may be gtg but thought I'd bring those few thing to your attention so you can look out for them .
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Old Today, 05:51 AM   #28
jetinteriorguy
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I seem to have plenty of neck tension judging by how much effort it takes to pull them. I'm using a mandrel that is undersize by .001, that's under the standard size mandrel, not just .001 under bullet size. I have shot six of these rounds during testing, primers were slightly flattened with no cratering and seemed to extract normal as far as I can tell shooting an AR indoors in a booth. Unfortunately I can't use my MagnetoSpeed on this rifle, just not enough room between the rail and brake for it to fit properly so I'm just watching for any drastic changes in POI and haven't noticed anything odd there to indicate a big change in MV due to a pressure spike.
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