Originally Posted by jmden
I agree with all that 100%. We're on the same page.
Originally Posted by Ultramag45
So I Shold be fine with my 338 Rum out 750 800..
Yes, if you have good verified data and are using a high BC bullet you should do fine to that range--keeping in mind that if anything changes you may need a new knob or use corrections. You can get a good feel for what temp and altitude changes, etc, will do using JBM.
For example, I have a sticker taped to my 300's scope right now that tells me the temp and altitude the data is for and that 18 degrees or 1000 ft pressure/elevation change each will require 1 click correction at 1000 yds. At 900 yds the correction is about 1/2 that. At 800 yds I would have to travel in time to mid August or be teleported to a different location before I need to worry....
Something that will help the success of anybody not using a PDA, whether the drop chart is on the stock or the turret, is to try and verify/set your elevation zero on location at the farthest distance possible. When you get there, put up a target at 800 yds if you can, and if it's off at all set the turret to say 800 yds. Or if using a drop chart, set the turret to what your chart says you should dial for 800 yds.
If you do this your data has to be WAY
off (which it shouldn't be) before it'll cause you problems at closer distances. Even if it was and you ended up 1/4 MOA off at 400 and 1/2 MOA off at 100, who cares? Being on at the longer distances is what matters--1/2 MOA at 800 will cause problems, 1/2 MOA at 100 not so much.
Even a 3, 5 or 600 yd check will eliminate errors better than going off a 100 yd zero alone. Don't worry about the windage when you do this, if you know it was on at 100 it's more likely you miscalled the wind at distance so don't mess with the scope.
Good luck. Oh, PDA