Originally Posted by Alan Griffith
I should find out in the next few days if I'm going to Alaska for Dall/Grizzly on 29 August.
I've been running up the canyon behind my house each early morning to check my cold bore zero. Each little adjustment gets me closer to what I think is needed. Yesterday I had two shots, 1/2" apart horizontally, which hit 2" high and 1" right of POA. This is typically a 3/4" 3-shot rifle. I adjusted my Mk4 4.5-14x50 2" down and 1" left. I then proceeded to hit my 10" LV steel plate from field conditions at 350, 425, missed just to the left edge of the plate at 525 and a 667 yd hit 3" left of center. Just to note, all hits were left of center on the plate. Zero wind, used EXBAL with my Kestrel 2500. Ranged w/ my Swaro 8x30 LRF.
This am I run back up and my 2 cold bore shots at 100 yds are on top of each other but 2" left and 1/2" low from POA. I adjust 3/4" right and 1/2" up from POA. I then proceed to try the plate at 713 yds and hit the chain holding the plate about 8" up and 2" right of the center of the plate. It seems at 100 yds my POI zero should be about 1" left and 1/2" low to hit out at long range.
Rifle/load is Rem 700, 26" stainless Dan Lilja barrel in 30-06 Ackley Imp pushing a Nosler 180 AB to 3000 fps. Weight 7.5 lbs. w/o sling or mag full of ammo. Used Harris bipods which adds weight.
My quesitons pretty much revolves around this. Should I get my final zero at base camp in the Wrangells at 3000' and not stress so much about this since I'm shooting at 5500' up my canyon, or should I stress and get this baby dead nuts on?
The conditions your shooting in and the conditions your going to be shooting in will have a minimal effect on your POI and your zero for the ranges your shooting at.
I had my duty rifle zeroed here in AK, when I went to LA, CA for training, it was substantially warmer, and higher Elevation. My POA POI was still the exact same.
Now, as far as your cold bore. Your changes in impact are likely a result of you.
What you need to do is shoot a cold bore for several days, then look at your targets. If they are consistently hitting the same area, adjust the required clicks per your scope. Then, do several cold bores again. If for a day or two your not hitting where you think you should, don't play with the scope, just do some more cold bores.
Often times many people get to hooked up on adjusting their scopes because the shot didn't go exactly where they wanted it. Most likely it is a result of somthing they did with their shooting mechanics, not a change in the rifle.