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Rifles, Reloading, Optics, Equipment
Reloading
Badlands BD-2 load data
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<blockquote data-quote="cbuck516" data-source="post: 2768915" data-attributes="member: 122236"><p>I too believe that there is physics-based logic for tightly-toleranced leads resulting in better alignment and ultimately better potential accuracy over a range of seating depths. </p><p>The 300 PRC saami chambering includes 0.234" of freebore that is 0.3088". I am only about 300 rounds into my 300 PRC, but I have found it to be a more forgiving cartridge than my 270Win which has no freebore. This is a fairly limited anecdotal observation, but the logic makes sense to me. Given how much variance in behavior can be seen rifle-to-rifle, chamber-to-chamber, I'm not sure how you would set up an experiment to prove this point universally. </p><p>I haven't done enough seating depth testing (jump testing) to say any of this with extreme confidence, but I am certainly not an individual that likes to live close to the lands. I tend to push fairly hard on pressure so I like the forgiveness that I get being further from the lands. As long as I can keep the bullet's bearing surface out of the case donut, I usually start hunting loads at 0.050" jump and target loads (lower pressure in most of my loads) at 0.020" jump. </p><p>I found the following seating depth test from F-Class John pretty intriguing. I've never tried one exactly like he did, but it is an interesting approach. </p><p>[MEDIA=youtube]BLYB5S4guZ8[/MEDIA]</p></blockquote><p></p>
[QUOTE="cbuck516, post: 2768915, member: 122236"] I too believe that there is physics-based logic for tightly-toleranced leads resulting in better alignment and ultimately better potential accuracy over a range of seating depths. The 300 PRC saami chambering includes 0.234" of freebore that is 0.3088". I am only about 300 rounds into my 300 PRC, but I have found it to be a more forgiving cartridge than my 270Win which has no freebore. This is a fairly limited anecdotal observation, but the logic makes sense to me. Given how much variance in behavior can be seen rifle-to-rifle, chamber-to-chamber, I'm not sure how you would set up an experiment to prove this point universally. I haven't done enough seating depth testing (jump testing) to say any of this with extreme confidence, but I am certainly not an individual that likes to live close to the lands. I tend to push fairly hard on pressure so I like the forgiveness that I get being further from the lands. As long as I can keep the bullet's bearing surface out of the case donut, I usually start hunting loads at 0.050" jump and target loads (lower pressure in most of my loads) at 0.020" jump. I found the following seating depth test from F-Class John pretty intriguing. I've never tried one exactly like he did, but it is an interesting approach. [MEDIA=youtube]BLYB5S4guZ8[/MEDIA] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Badlands BD-2 load data
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