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<blockquote data-quote="rpierce" data-source="post: 1841049" data-attributes="member: 20643"><p>Heres the powder charge test with VV N570. It finally had a velocity node when the case started getting full. 300 gr Berger bullet at 3280-3300 fps is the node and is two grains wide for only a 38 fps change in velocity. Case web was the same size as 3150 fps with IMR 8133. Still .00125-.00015 under chamber size so its not a HOT load but is definitely on the higher end. I decided to try a seating depth test. Loaded up .038 off the lands and shot roughly a 1.035" / .17 moa group at 580 yds. 3280 fps and a ES of 9 fps. About 10 rounds later the barrel sped up so I loaded up the rest of the unfired brass w h50bmg so it would be easy on the throat til the brass is fired once and the barrel is done speeding up. Now that its done ill go back and retweek the load slightly. Even with a 300 gr berger at 3300 fps I have no problem spotting hits with this setup and the scope at 27x. I can watch the huge vapor trail from the 300 gr berger go down to the target. Heres the 100 yd group I did while shooting the powder charge test. 108-116 gr was the lower half of the group. 117-121.5 was the upper half of the group. Lower right shot was 108 gr. Barrel was cold and clean for that shot.</p></blockquote><p></p>
[QUOTE="rpierce, post: 1841049, member: 20643"] Heres the powder charge test with VV N570. It finally had a velocity node when the case started getting full. 300 gr Berger bullet at 3280-3300 fps is the node and is two grains wide for only a 38 fps change in velocity. Case web was the same size as 3150 fps with IMR 8133. Still .00125-.00015 under chamber size so its not a HOT load but is definitely on the higher end. I decided to try a seating depth test. Loaded up .038 off the lands and shot roughly a 1.035" / .17 moa group at 580 yds. 3280 fps and a ES of 9 fps. About 10 rounds later the barrel sped up so I loaded up the rest of the unfired brass w h50bmg so it would be easy on the throat til the brass is fired once and the barrel is done speeding up. Now that its done ill go back and retweek the load slightly. Even with a 300 gr berger at 3300 fps I have no problem spotting hits with this setup and the scope at 27x. I can watch the huge vapor trail from the 300 gr berger go down to the target. Heres the 100 yd group I did while shooting the powder charge test. 108-116 gr was the lower half of the group. 117-121.5 was the upper half of the group. Lower right shot was 108 gr. Barrel was cold and clean for that shot. [/QUOTE]
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