Re: Need some help on choices M1, M2 or Cds dials for leupold?
Do a search on the CDS. There have been many posts on this subject recently. In a nut shell, the CDS comes with an elevation turret marked in MOA. Once you have your load developed and determined your actual drop, you call Leupold, give them your CDS model number and serial number, and they will send you another turret marked in yardages. Use the yardage turret for your home state and the MOA for when you travel, or shoot at different elevations.
From a practical standpoint, there is very little if any change in your bullets drop for the first 400 to 500 yards. Use some ballistic software and vary the elevation and temperature inputs and you will see what I mean. There is a difference in drop once you get further out (500-600 yds), but it is usually only a couple of clicks. easy enough to compensate for by dialing and then adding or subtract a couple more clicks. Just make sure to re-zero your rifle to the new elevation before shooting. If not, then your clicks will be off by a substantial difference.