[QUOTE=Bravo 4;612945]I agree that BDC turrets are not a cure all one-stop-shop. My opinion is that they do have their place, and a turret with BDC as well as MOA (or Mil) offer the best of both worlds. However, the numbers don't have to line up to use it as a reference point. I have to do this every time we are on the range with the M24's. Like I stated earlier the BDC turrets are quick and accurate out to mid range (400yards to me). It takes a lot of changes in environmental conditions to make a noticeable change in POI differences at medium distance.
For an example I just punched the numbers into JBM for the average MV of my M110 (since it's scope turrets have both). A 175 gr SMK @ 2530 fps.
I threw in a 50 degree difference in temperature, 80% difference in humidity, and went from 28.00 in HG pressure to 31.5 in HG. The difference in POI is only a couple inches of drop...unless I'm doing something wrong. Ballistic calculators and I don't seem to get along.
I know that in most conditions I can turn the BDC to 4 and hit within inches of POA (not counting wind).
Just another way to skin that darn cat.[/QUOTE/
My experience using a BDC is very similar to yours using my 308, which for me is a 600 yard hunting rifle. A few years ago I went to a 6.5x284 and extended my range to 1000 yards with similar effect. The two areas I hunt are 2000ft and 5000ft altitude. Temperatures are generally 25 degrees , plus or minus 20 degrees. I have two BDC turrets for 2000 and 5000ft at 25 degrees both calibrated with actual POI out to 1000 yards. For each hunting area with the turret I don't need to pay much attention to temperature or pressure out to 600 yards. From 600 to 1000 yards, click adjustments for each condition are easily memorized and accounted for and only necessary if temperature varies more than 20 degrees or altitude(corresponding pressure) more than 1000 feet. This is one or two clicks for each condition depending on the actual range ot to 1000 yards. It sounds more complicated than it is but it's not, once you understand the effects. It's all personal preference. I used MOA for years and found
that for me this system has been very effective with the hunting I do. The extra turrets cost me $200 and I have a MOA turret and ballistic calculator should I feel the need to use them. Also, I don't change my load, and have enough components of the same lot to last the life of the barrel, or my own life, whichever comes first.