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For you MK 4 guys.

 
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  #22  
Old 02-12-2012, 08:27 AM
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Re: For you MK 4 guys.

[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.
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  #23  
Old 02-12-2012, 09:46 AM
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Re: For you MK 4 guys.

Quote:
Originally Posted by Greyfox View Post
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.
I agree. What it all boils down to is knowing how to use the system you have to the fullest. Where hunter/shooters get into trouble is they go out and get drops for their rifle and think they are done. If you only shoot short to mid ranges you will probably be ok for almost anything. The problem is when shooters don't know how much environmental conditions will change the flight of the bullet. How much will a 20-30 degree change in temp effect your POI? That kind of change in temp will happen almost everywhere on the planet almost every single day. So aquiring drops in the morning at long range then checking them at the hotest part of the day will give you different results. This is just an example that goes along with other changing conditions. It has to be applied no matter what your turrets have marked on them, moa/mil/BDC or a combo. The numbers on any turret are just reference marks, just like the base lines. I don't see why guys get into a little hissy over moa v's mil, my way is better then your way, blah-blah-blah. Especially when the end result is the same, you probably don't really know how to use either!

I also agree that MY .308 is only a 600 yard deer rifle. It's an auto so I don't push any limits with it velocity wise, and it averages a little better then moa with the current load. There are some guys out there getting great results at some pretty far ranges with their bolt guns and heavy loads.
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Last edited by Bravo 4; 02-12-2012 at 09:50 AM. Reason: Added info
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