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HELP! I知 so confused

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/01/2007 at 23:29
aaatkr View Drop Down
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Great site.  I'm glad I found it.  Unfortunately, I have become more confused.  I was all set to buy a nice mil-dot variable 6x24 for targets and varmints( 100-500 yards).  I thought that a mil-dot was a mil-dot was a mil-dot.  I didn't realize that as I changed magnification, the values of the distances between dots could change dramatically.  I learned that a first focal plane scope would not have these problems. What good is a mil-dot variable if I change power and no longer know my values?  Why not just have a standard crosshairs reticle?  I heard that the first focal plane scopes can have a reticle that is hard to see on lower powers.  Is that true?  Is there a first focal plane mil-dot scope in my budget of $600?  Is there some where on this site where I can see the difference in sight picture between the two?   Thanks for all your help.

Edited by aaatkr
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/02/2007 at 09:04
Duce View Drop Down
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You may want to check out the mil-dot master at SWFA it will let you figure out the changes at different powers

 

Duce

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/02/2007 at 09:15
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When you use a mil-dot to determine range you want to be as accurate as possible so you use it on the highest power to determine as accurately as possible tenths of a mil. If you think about it this makes sense. In actual use most guys that have mil-dot scopes also own rangefinders and use the rangefinder to determine distance.  Using a mil-dot is always a guess because you are using some object of a supposedly known size say 16 in wide shoulder width of an enemy soldier but what if he is a big guy and his shoulders are 19 in wide or a little guy and his shoulders are 14 in wide. If such is the case your range derermination will be off. With people that is not as big of a factor as with animals because animals are built side to side and people are built up & down. So a 10 percent error in calculation might yield a strike somewhere on a person and entirely miss an animal. Now when you are talking varmit and target gun the reality is that targets are shot at known distances and varmits are encountered at various distances and move rapidly so too much magnification can slow you down. When hunting varmits you are better off to determine known distances where you are hunting and set  markers out at the known distances. When I bow hunt I place flagging tape at 15 yds 20yds and 30 yds and I can figure from that about where 40 yds is and I dont usually shoot farther. At my deer blind I have steel posts at 100, 200 and 300 yds. Now if you are hunting the amount of exit eye pupil of the scope is important because most game is encountered early AM or late evening. Probably the bigest advantage of tactical scopes is the ease of adjusting the scope. Say you sight in at 100 yds and you determine  for example that if you turn the adjustment knob up 2 & 1/4 moa (9 clicks on a 1/4 moa scope) then you are on at 200 yds it is easy to do that with the large target knobs then it is easy to adjust back down 9 clicks to your 100 yd zero. The down side of having large tactical knobs is that they catch on brush and everything else. Unless you are a Police or Military sniper a FFP scope is not really needed and lots of them work with less under conditions where they are getting shot at.  Balistic Compensating scope reticles similarly only work at the highest power. You can actually do something similar with a duplex scope if you sight the crosshair at 200 and check at 100 to see how closely it corresponds to where the crosshair goes from thin to wide above  then go to 300 yds and check to see how where it goes from thin to wide below corresponds to your 300 yd point of impact.  A fixed 6x42 scope duplex used in that manner is quite deadly. If you want a 6x42 with a mil dot and tactical knobs IOR makes one in your price range and it is superb. If you feel you really want more magnification the 10x or 16x fixed power Super Sniper scopes are a bargain. If you must have a variable then you live with its good points (ability to change power) and you also live with it's bad points. With a fixed power scopes FFP is not an issue. The real down side to high magnification scopes like 16x is they are so dark in the evening due to the small exit eye pupil.

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/02/2007 at 12:59
Trinidad View Drop Down
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Here is a great link with all the info you will need.

 

http://demigod.org/articles/practical-long-range-rifle-shoot ing-optics/

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/02/2007 at 13:32
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Unfortunately you have to spend alittle more to jump to the FFP...

 

SFP  on some you mil off the highest power...  I had reservations on that before, but after further use..  Its not really a big of deal as you would think...  Chances are you would be using the highest power anyways and if not you can still use the mil formula to get ranges..

 

Meters

(Target Inch x 25.4) divided (Mils divided by Power setting on scope) (Example 12 would be 1.2 and 8 would be .8)

Yards

(Target Inch x 27.8) divided (Mils divided by Power setting on scope)

 



Edited by TPS_Phil
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/02/2007 at 13:45
Dale Clifford View Drop Down
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Not all SFP range at the highest power.  Some do some don't. They can be calibrated to range at any power and the change in impact (up and down) is proportional to the power. Leo varmits have two ranging values. each one for a group of calibers having different trajectories and if you have the drop chart for your loads, one can re-calibrate to this. NF 8.32 range at 22x and 5.5x22 range at 22. NF has a computer ballisitc program that allows one to change the calibrations. TPS is absolutely right about it not being a big deal. FFP range estimation at close range is it's only advantage and usually something for LE or military when FOV retention is necessary.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/02/2007 at 14:16
TPS_Phil View Drop Down
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Thanks for the correction Dave,

 

My main playing on a SFP was on the M107 (Leupold its set on the highest power for this application)

 

 



Edited by TPS_Phil
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/02/2007 at 14:17
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Originally posted by Dale Clifford Dale Clifford wrote:

Not all SFP range at the highest power.  Some do some don't. 

 

That's very true. 

My new Nikon Monarch 6.5-20 "mils" @ 12x.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/02/2007 at 23:44
aaatkr View Drop Down
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Hey Duce,

 

What is a mil-dot master you mentioned?

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/03/2007 at 04:03
TPS_Phil View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/03/2007 at 06:59
Duce View Drop Down
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Thanks for posting it Phil

 

Duce

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/03/2007 at 07:43
Duce View Drop Down
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http://www.mil-dot.com/index.htm

 

Is another SWFA site with good information

 

Duce 

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