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Rifles, Reloading, Optics, Equipment
Reloading
What is a "Ladder Test"?
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<blockquote data-quote="ricka0" data-source="post: 81024" data-attributes="member: 3086"><p><strong>Re: What is a \"Ladder Test\"?</strong></p><p></p><p>[ QUOTE ]</p><p> <font color="purple"> <strong>Recommend that you keep the jump in powder increments to no more than .3 gr. If you use .5 you can skip over a node completely....I use either .2 or .3 grain increments over that 4 grain range and normally find about 3-4 nodes.</strong> </font> </p><p></p><p>[/ QUOTE ]</p><p>You really need to normalize your powder increments (pi). Suggesting .2g for a 50 BMG with a starting load of 213gr - you'd wear out your barrel before you found your nodes.</p><p></p><p>The guy that dominates 50 BMG hunter class in this area told me he uses 3gr pi on his new guns (as do many of the best competitors). That's 15x higher pi than you suggest. I go with 2gr for my 50's, slightly less that 1%</p><p></p><p>PI is only meaningful if you give it as a % of starting/max load. Maybe you were talking about your your 17 Hummer /ubbthreads/images/graemlins/smile.gif</p><p></p><p>Go too low and you'll be at the range all day waiting on your barrel to cool (or cleaning it).</p><p></p><p> <a href="http://groups.msn.com/50bmg/loadbuildup.msnw" target="_blank">"Toby" Bradshaw</a> A local shooter and Biology Professor at the UW recommends 1gr pi - 2gr for bigger cases (he's talking about my 300 RUM)</p><p>The Toby link is an archive of his pontifications on load build up.</p></blockquote><p></p>
[QUOTE="ricka0, post: 81024, member: 3086"] [b]Re: What is a \"Ladder Test\"?[/b] [ QUOTE ] <font color="purple"> [b]Recommend that you keep the jump in powder increments to no more than .3 gr. If you use .5 you can skip over a node completely....I use either .2 or .3 grain increments over that 4 grain range and normally find about 3-4 nodes.[/b] </font> [/ QUOTE ] You really need to normalize your powder increments (pi). Suggesting .2g for a 50 BMG with a starting load of 213gr - you'd wear out your barrel before you found your nodes. The guy that dominates 50 BMG hunter class in this area told me he uses 3gr pi on his new guns (as do many of the best competitors). That's 15x higher pi than you suggest. I go with 2gr for my 50's, slightly less that 1% PI is only meaningful if you give it as a % of starting/max load. Maybe you were talking about your your 17 Hummer [img]/ubbthreads/images/graemlins/smile.gif[/img] Go too low and you'll be at the range all day waiting on your barrel to cool (or cleaning it). [url="http://groups.msn.com/50bmg/loadbuildup.msnw"]"Toby" Bradshaw[/url] A local shooter and Biology Professor at the UW recommends 1gr pi - 2gr for bigger cases (he's talking about my 300 RUM) The Toby link is an archive of his pontifications on load build up. [/QUOTE]
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What is a "Ladder Test"?
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