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Rifles, Reloading, Optics, Equipment
Reloading
Measuring to the lands
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<blockquote data-quote="Bart B" data-source="post: 1123301" data-attributes="member: 5302"><p>It is if you shoot a lot of ammo.</p><p></p><p>Consider this 270-shot test group of the 1965 lot of Lake City M118 7.62 National Match ammo at 600 yards:</p><p></p><p><img src="https://farm6.staticflickr.com/5650/21921672136_f980944930.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Inside circle's 6 inches, outside is 12. Mean radius is 1.9 inch, Extreme spread is about 10 inches. </p><p></p><p>That group is a composite of 18 fifteen-shot, or 27 ten-shot groups, or 54 five-shot groups or 90 three-shot groups; if you choose to look at it other ways. Which series of 3, 5, 10 or 15 shots fired in sequence for a group is the smallest" Which is the largest? One thing's for sure; all the few-shot group centers are not at the same place relative to the point of aim which is at the middle of the rings.</p><p></p><p>I have no problem testing 20 or 30 shots of a load for its accuracy I can count on.</p><p></p><p>That aside, I've never worked up any load for a new barrel except for a .264 Win. Mag. Just used with the match winners and record setters use and got the same accuracy testing they do; sometimes better. Never considered the smallest group fired of any I've fired with less than 15 shots in it.</p><p></p><p>Here's two 15-shot groups with two different loads, each shot from each fired alternately. I think it shows what a 30-shot group with each is reasonably capable of. The last one of each load had 28 or 29 shots fired before it was. 10-ring's ten inches. 190's (black dots) shot with once fired cases with turned necks full length sized, 200's (red dots) shot with unprepped new cases. Each load's group is under 5 inches.</p><p></p><p><img src="https://farm3.staticflickr.com/2633/4198676118_3ab2c51373_m.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="Bart B, post: 1123301, member: 5302"] It is if you shoot a lot of ammo. Consider this 270-shot test group of the 1965 lot of Lake City M118 7.62 National Match ammo at 600 yards: [img]https://farm6.staticflickr.com/5650/21921672136_f980944930.jpg[/img] Inside circle's 6 inches, outside is 12. Mean radius is 1.9 inch, Extreme spread is about 10 inches. That group is a composite of 18 fifteen-shot, or 27 ten-shot groups, or 54 five-shot groups or 90 three-shot groups; if you choose to look at it other ways. Which series of 3, 5, 10 or 15 shots fired in sequence for a group is the smallest" Which is the largest? One thing's for sure; all the few-shot group centers are not at the same place relative to the point of aim which is at the middle of the rings. I have no problem testing 20 or 30 shots of a load for its accuracy I can count on. That aside, I've never worked up any load for a new barrel except for a .264 Win. Mag. Just used with the match winners and record setters use and got the same accuracy testing they do; sometimes better. Never considered the smallest group fired of any I've fired with less than 15 shots in it. Here's two 15-shot groups with two different loads, each shot from each fired alternately. I think it shows what a 30-shot group with each is reasonably capable of. The last one of each load had 28 or 29 shots fired before it was. 10-ring's ten inches. 190's (black dots) shot with once fired cases with turned necks full length sized, 200's (red dots) shot with unprepped new cases. Each load's group is under 5 inches. [img]https://farm3.staticflickr.com/2633/4198676118_3ab2c51373_m.jpg[/img] [/QUOTE]
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