Axe
Welcome to Long Range Hunting.
You've sort of answered your own question about which of the two rifles to use... Stick with the 280...you know it better.
If you're just now venturing into this "Long Range" stuff and have no prior experience there are a few things you'll do well to re-think. IMHO you need to forget about light for caliber bullets and go to the heavy/ier High BC bullets...I don't know if this is something you've already considered or not.
First...get an accurate load for the rifle and brush up on your marksmanship skills. You'll be well served to have a maximum of a 1 MOA load developed. "Zero" your rifle at 100 yards... this means Point Of Aim (POA) equals Point Of Impact (POI)... reset your scope turrets (windage and elevation) to indicate -0-.
Move your target to 200 yards once you're confident that your POA = POI at 100 yards and you can "call your shots" well. Shoot the 200 yard target with the rifle still "zeroed" for 100 yards... once you're confident that you have a stable group measure the distance between the POA and POI at 200 yards. Divide this value (in inches) by 2 and this is your first set of data... your 200 yard "come-up" or "click data" Adjust your scope UP by this value... for example... if the value in inches is 1.5 you'll need to come UP on your elevation by 1.5 MOA or 6 "clicks" on a .25 MOA "click" scope. Once you have this completed fire on the 200 yard target again...you should be hitting POA = POI (dead-on).
Repeat this procedure for 300, 400, 500, etc and get the "come-up" value by dividing the difference between POA to POI at each yardage by the yardage value divided by 100. For example... at 300 yards your group may be 6 inches low with the 1.5 you had on for 200 yards. Take the 6 inches and divide by 3 (300/100 = 3)... turn the elevation UP 2 more MOA (8 "clicks") you're now sighted at exactly 300 yards... Verify this to be true by shooting a group to make sure your 300 yards POA = POI.... same for 400 and 500... divide by 4 at 400 and 5 at 500.
You'll need a lot of ammo of all the same specification(s)... Consistancy is probably the single most important item in long range shooting... Your ammo must all be the same... if you're going to shoot an accurate factory load you need to stick with the same LOT number for consistancy.
Once you get going you'll see it not too difficult on a good day. Out to 500 yards is going to be a "chip shot" soon enough and 1000 yards will be doable but you'll be in the "hooked for life" club by then and will have several different rifles to show as proof. If you're married tell your wife Boyd Heaton or Len Backus got you started... don't mention my name as I'm in trouble with enough spouses already
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P. S.
Spend a few days going over some of the old posts in the "The Basics, starting out" forum.
Good Luck
[ 09-29-2003: Message edited by: Dave King ]