Okay, here is my dilemma! I have shot at 700 yards and 400 yards with my .308. My muzzle velocity is an average of 2612 with a 168 A-Max. I have been using a load of 48.0 grns RL17 with Wolf LR Primers. Everything seems to be spot on for grouping.
Here's the kick in the pants. On the day 12/30/09 we shot 700yrds I needed 22.25MOA up and 6.5MOA to the left. Conditions were less than desirable for this type of shooting but we had to deal with what we had. Temp 24, Baro 28.880, Humidity 71%, Elevation 978, overcast.
Wind conditions, 10-15 head on at the bench with an avg of 12. At the target left to right 8-12mph.
On 1/13/10 temp 29, Baro 28.77, Humidity 63%, Elevation 1079, slight mirage, winds right to left at 90 deg. 410yrds= 8.25MOA and Wind@10mph=2.75 dead on shooting a solid 1MOA group.
Now when I punch these numbers into my balistics program I can't get them to match up. My question is, will a strong head on wind force my bullet to drop requiring more elevation compared to a calm day? The second problem is that for 410 yards I have to leave the BC at the suggested factory BC and drop my velocity to 2600fps from the above avg. of 2612. The numbers are almost spot on. But in those heavy winds, I am 2MOA shy of what I needed to get successful hits at 700yrds. Can somebody help me here?
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