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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet testing, again....
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<blockquote data-quote="yorke-1" data-source="post: 2252908" data-attributes="member: 11960"><p>Interesting results from today's testing. I was out shooting 4 different 6.5mm Hammer bullets testing low velocity (under 2400 fps) impacts. I did my best to keep the impact velocities of each bullet relatively close by adjusting my range, not the muzzle velocity of the loads. The gun is a 1:8" twist 6.5 Grendel with an 18" barrel. This particular barrel is a Blackhole barrel with polygonal rifling. These are the muzzle velocities and SF of each load shot:</p><p></p><p>[MEDIA=youtube]yDebQAZ-5os[/MEDIA]</p><p></p><p>The 85gr bullet penetrated 20" and curved slightly down and right. It retained roughly 30% of the nose petals.</p><p><img src="https://i.imgur.com/9oZCECD.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p><img src="https://i.imgur.com/4vembCH.jpg?1" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>The 99gr bullet penetrated roughly 18" with he first shot exiting the left sided of the second block after changing course and the second one stopped at 18.5" after veering up and left. The recovered bullet looked very similar to the recovered 85gr bullet. I switched to the 99gr HH in my Grendel a while back trying to step up the velocity from the 130gr SH I was shooting in there previously.</p><p><img src="https://i.imgur.com/6FgEa3U.jpg?1" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p><img src="https://i.imgur.com/x0Ios0x.jpg?1" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p></p><p></p><p>The 124gr bullets shot terribly, 3 MOA at 165 yards. The one that I got to hit the block expanded, then curved up and exited the second block at 20"</p><p><img src="https://i.imgur.com/LpNzS6u.jpg?1" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p><img src="https://i.imgur.com/E5ko2f6.jpg?1" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>The 130gr SH is the bullet I had been shooting the Grendel prior to switching to the 99gr HH about a year ago. After my first shot in the gel with a 2410 fps impact, I was surprised by what I saw. The 130gr SH with a relatively mild 2410 fps impact velocity penetrated 48" of gel before exiting the third block. The penetration path was perfectly straight. I was so impressed by this that I moved back so that the impact velocity was roughly 2200 fps to see how that would impact performance. Again, the bullet penetrated 48" of gel before exiting the third block. I moved back one more time to my bench and fired the last shot with an impact velocity of 2150 fps, and go the same result. I made a separate video of these impacts just because I found them so fascinating. </p><p></p><p>[MEDIA=vimeo]582313806[/MEDIA]</p><p></p><p>It's hard to really judge the temporary wound cavities of the bullets since I'm trying to catch a single frame from a video that's only recorded at 120 frames/sec. I thought it was interesting that the cavity recorded from the 130gr SH out of the Grendel looked identical to the one I captured from the 275 SH out of the 375 Ruger.</p><p><img src="https://i.imgur.com/CTKSDbo.jpg?1" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="yorke-1, post: 2252908, member: 11960"] Interesting results from today's testing. I was out shooting 4 different 6.5mm Hammer bullets testing low velocity (under 2400 fps) impacts. I did my best to keep the impact velocities of each bullet relatively close by adjusting my range, not the muzzle velocity of the loads. The gun is a 1:8" twist 6.5 Grendel with an 18" barrel. This particular barrel is a Blackhole barrel with polygonal rifling. These are the muzzle velocities and SF of each load shot: [MEDIA=youtube]yDebQAZ-5os[/MEDIA] The 85gr bullet penetrated 20" and curved slightly down and right. It retained roughly 30% of the nose petals. [img]https://i.imgur.com/9oZCECD.jpg[/img] [img]https://i.imgur.com/4vembCH.jpg?1[/img] The 99gr bullet penetrated roughly 18" with he first shot exiting the left sided of the second block after changing course and the second one stopped at 18.5" after veering up and left. The recovered bullet looked very similar to the recovered 85gr bullet. I switched to the 99gr HH in my Grendel a while back trying to step up the velocity from the 130gr SH I was shooting in there previously. [img]https://i.imgur.com/6FgEa3U.jpg?1[/img] [img]https://i.imgur.com/x0Ios0x.jpg?1[/img] The 124gr bullets shot terribly, 3 MOA at 165 yards. The one that I got to hit the block expanded, then curved up and exited the second block at 20" [img]https://i.imgur.com/LpNzS6u.jpg?1[/img] [img]https://i.imgur.com/E5ko2f6.jpg?1[/img] The 130gr SH is the bullet I had been shooting the Grendel prior to switching to the 99gr HH about a year ago. After my first shot in the gel with a 2410 fps impact, I was surprised by what I saw. The 130gr SH with a relatively mild 2410 fps impact velocity penetrated 48" of gel before exiting the third block. The penetration path was perfectly straight. I was so impressed by this that I moved back so that the impact velocity was roughly 2200 fps to see how that would impact performance. Again, the bullet penetrated 48" of gel before exiting the third block. I moved back one more time to my bench and fired the last shot with an impact velocity of 2150 fps, and go the same result. I made a separate video of these impacts just because I found them so fascinating. [MEDIA=vimeo]582313806[/MEDIA] It's hard to really judge the temporary wound cavities of the bullets since I'm trying to catch a single frame from a video that's only recorded at 120 frames/sec. I thought it was interesting that the cavity recorded from the 130gr SH out of the Grendel looked identical to the one I captured from the 275 SH out of the 375 Ruger. [img]https://i.imgur.com/CTKSDbo.jpg?1[/img] [/QUOTE]
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Bullet testing, again....
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