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The Range
Rifle & Shotgun Discussion
.308 and barrel length
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<blockquote data-quote="swampratt" data-source="post: 2504375" data-attributes="member: 15054"><p>Ok i shot it ..Dang it is windy!!! 25MPH winds. blew my hat off and blew the sky screne off my crony once.</p><p></p><p>I shot it at banner 100 yards. Looks like taking it from 24" down to 20.5" i lost 54 fps on the average.</p><p></p><p>First shot clean cold bore was out of the 5 shot group..it measured 1.860" center to center, count the other 4 shots only and the group is .695"</p><p>Not bad for the wind..Yes making excuses!</p><p>Now the next 5 shots had much less FPS spread 14 fps spread and .928" group.</p><p>FPS looked like this. Virgin Lapua brass i worked over.</p><p>2599</p><p>2613</p><p>2608</p><p>2609</p><p>2613....Barrel temp for this group starting was 99F and climbed to 104F</p><p></p><p>Then some necksized only brass that was once fired. Some bullets are on the lands and some are .005-.010 off the lands.</p><p>That was an 8 shot group that measured 1.185" barrel temp was 104F.</p><p>2615 fps</p><p>2628</p><p>2622</p><p>2611</p><p>2626</p><p>2645 in the lands a bunch.</p><p>2604</p><p></p><p>I feel i need to shoot on a calm day like i did before the barrel cut.</p><p>But that second 5 shot group was best virgin lapua 5 shot group at 100 yards i have.. and the worst day for shooting.</p><p>And even the 8 shot group was better than some of my 24" barrel 5 shot groups.</p><p>Overall i feel successful.</p><p>Muzzle jump is not any different than before.. maybe the 54fps loss counteracted it.</p><p>Or maybe i just do not notice.</p><p></p><p>All shots were back to back no cool down ..I had one hour to get to the range and back home.</p><p>Barrel temp started at 87F first shot and climbed to 104F after 18 shots.</p></blockquote><p></p>
[QUOTE="swampratt, post: 2504375, member: 15054"] Ok i shot it ..Dang it is windy!!! 25MPH winds. blew my hat off and blew the sky screne off my crony once. I shot it at banner 100 yards. Looks like taking it from 24" down to 20.5" i lost 54 fps on the average. First shot clean cold bore was out of the 5 shot group..it measured 1.860" center to center, count the other 4 shots only and the group is .695" Not bad for the wind..Yes making excuses! Now the next 5 shots had much less FPS spread 14 fps spread and .928" group. FPS looked like this. Virgin Lapua brass i worked over. 2599 2613 2608 2609 2613....Barrel temp for this group starting was 99F and climbed to 104F Then some necksized only brass that was once fired. Some bullets are on the lands and some are .005-.010 off the lands. That was an 8 shot group that measured 1.185" barrel temp was 104F. 2615 fps 2628 2622 2611 2626 2645 in the lands a bunch. 2604 I feel i need to shoot on a calm day like i did before the barrel cut. But that second 5 shot group was best virgin lapua 5 shot group at 100 yards i have.. and the worst day for shooting. And even the 8 shot group was better than some of my 24" barrel 5 shot groups. Overall i feel successful. Muzzle jump is not any different than before.. maybe the 54fps loss counteracted it. Or maybe i just do not notice. All shots were back to back no cool down ..I had one hour to get to the range and back home. Barrel temp started at 87F first shot and climbed to 104F after 18 shots. [/QUOTE]
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