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Rifles, Reloading, Optics, Equipment
Reloading
High Group Variance within a Ladder Test
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<blockquote data-quote="willfrye027" data-source="post: 3066003" data-attributes="member: 114992"><p>There is GOOD quality evidence that precision does not change in any meaningful way with incremental charge weights, until you are at/above max pressure. Check out what Brian Litz is writing about and what hornady has done with accuracy fixtures and massive group sizes.</p><p></p><p>Personally, in the last 15 or so loads I have developed what I do is a single shot working up until pressure signs, over a chrono. Seated to fit mag length or whatever length is out of the lands.</p><p></p><p>10 shot group at a grain or so below pressure.</p><p></p><p>If it shoots, you're done. If not, change powder and repeat. If you've tried a couple powders, change bullet.</p><p></p><p>This, plus understanding normal distribution and having realistic expectations for group size, has mostly eliminated reloading headaches and surprises. No more "I found the perfect node!" Only to have it shoot poorly on the next range trip.</p><p></p><p>FWIW my hunting rifles are 1.0-1.5 moa for 10-20 shot groups. </p><p></p><p>It's a can of worms to open up but has been enlightening to take a deep dive into this subject.</p></blockquote><p></p>
[QUOTE="willfrye027, post: 3066003, member: 114992"] There is GOOD quality evidence that precision does not change in any meaningful way with incremental charge weights, until you are at/above max pressure. Check out what Brian Litz is writing about and what hornady has done with accuracy fixtures and massive group sizes. Personally, in the last 15 or so loads I have developed what I do is a single shot working up until pressure signs, over a chrono. Seated to fit mag length or whatever length is out of the lands. 10 shot group at a grain or so below pressure. If it shoots, you’re done. If not, change powder and repeat. If you’ve tried a couple powders, change bullet. This, plus understanding normal distribution and having realistic expectations for group size, has mostly eliminated reloading headaches and surprises. No more “I found the perfect node!” Only to have it shoot poorly on the next range trip. FWIW my hunting rifles are 1.0-1.5 moa for 10-20 shot groups. It’s a can of worms to open up but has been enlightening to take a deep dive into this subject. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
High Group Variance within a Ladder Test
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