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<blockquote data-quote="Longbullet" data-source="post: 629164" data-attributes="member: 44663"><p>A couple weeks ago I had about the same problem. At 975yrds, I was hitting about 3moa low , with my 260 rem/6.5-20x44 Viper pa, shooting 140vld at 2800fps. After shooting through the chrony again, I realized my speed was only 2705fps. The last time I chrono'ed it was last summer, and I'm thinking that there must have been a big temperature differance, because I didn't log the temp. back when I came up with the 2800fps. I was also wondering if the click value on the scope was accurate. If I find the click value is not exactly what is claimed, I guess I will adjust the velocity on the drop chart to match my POI at 200ydrs and 1000yrds, and then verify inbetween. I'd check 200yrd zero and rechrono.</p><p>Hope this helps.</p></blockquote><p></p>
[QUOTE="Longbullet, post: 629164, member: 44663"] A couple weeks ago I had about the same problem. At 975yrds, I was hitting about 3moa low , with my 260 rem/6.5-20x44 Viper pa, shooting 140vld at 2800fps. After shooting through the chrony again, I realized my speed was only 2705fps. The last time I chrono'ed it was last summer, and I'm thinking that there must have been a big temperature differance, because I didn't log the temp. back when I came up with the 2800fps. I was also wondering if the click value on the scope was accurate. If I find the click value is not exactly what is claimed, I guess I will adjust the velocity on the drop chart to match my POI at 200ydrs and 1000yrds, and then verify inbetween. I'd check 200yrd zero and rechrono. Hope this helps. [/QUOTE]
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