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Savage 308 /175 SMK - Bullet Drop Question

 
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  #22  
Old 01-03-2011, 12:29 PM
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Re: Savage 308 /175 SMK - Bullet Drop Question

dodgefan thanks for the link
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  #23  
Old 01-03-2011, 12:57 PM
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Re: Savage 308 /175 SMK - Bullet Drop Question

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Originally Posted by dodgefan View Post
Not Sbruce, but IPHY is Inches Per Hundred Yards. As far as Mil dots go here is some light reading for you. Should help get a better understanding of it.
Learn More About Mil-Dots in Rifle Scopes

That makes my brain hurt.... I need to go lie down!


Tank
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  #24  
Old 01-03-2011, 02:11 PM
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Re: Savage 308 /175 SMK - Bullet Drop Question

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Originally Posted by KPB71 View Post
SBruce, what is IPHY? Im still trying to figure out Mil Dots and how they work.Thanks everyone for there help
Inch per hundred yards is very similar to moa or minute of angle, and sometimes refered to as "shooters moa".

A true minute of angle covers 1.0472" per hundred yards. some scopes (not all) take 4 clicks to supposedly move point of impact one moa. one moa = 10.472" at 1000.

IPHY is exactly 1" per hundred yards.......drop the .0472 BS. 1" at 100 covers 10" at 1000. Some scopes supposedly move the poi in 1/4 IPHY (4 clicks = 1").
Very close to true moa except for long distance and/or moving the adjustments by alot of clicks.

Mil is milliradian and covers 3.6" per hundred yards, or 1yard at 1000 yards.
One mil also equals 3.438 moa. some scopes have 1/10" mil adjustments (takes 10 clicks to move poi one mil).

IPHY is surely the easiest to use for quick calculations in the field. Especially since we think of our targets and drops/drifts in terms of inches, not yards.

I say suposedly on the scope clicks, because I've lost count of how many scopes I've seen that didn't move the poi exactly the advertised amount. Some are way off of what they should be.
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  #25  
Old 01-03-2011, 05:17 PM
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Re: Savage 308 /175 SMK - Bullet Drop Question

SBruce I punched in the number for the 175 SMK on jbm 400yrds zero the drop at 600yrds is 43.1 inches and moa is 6.9 If MOA is 1.0472 x600=6.28 and IPHY is 1"x600= 6.0 how do they come up with 6.9moa. so it would take 27,28 clicks with 1/4 clicks to get 6.9moa. or am i confused.


thanks again
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  #26  
Old 01-03-2011, 05:34 PM
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Re: Savage 308 /175 SMK - Bullet Drop Question

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Originally Posted by KPB71 View Post
SBruce I punched in the number for the 175 SMK on jbm 400yrds zero the drop at 600yrds is 43.1 inches and moa is 6.9 If MOA is 1.0472 x600=6.28 and IPHY is 1"x600= 6.0 how do they come up with 6.9moa. so it would take 27,28 clicks with 1/4 clicks to get 6.9moa. or am i confused.

thanks again
43.1/6.28 = 6.86 moa. OR, 43.1/1.0472/6 = 6.86 moa. They are simply rounding to the nearest 1/10th minute in the program. You are correct with 27 1/2 clicks (if your clicks are truely precisely 1/4 moa). Again, click value should be tested/varified; because I've lost count of how many scopes don't move the poi the exact advertised amount.
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  #27  
Old 01-03-2011, 06:19 PM
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Re: Savage 308 /175 SMK - Bullet Drop Question

SBruce So is the 6.28 and 6.0 moa


Sorry for all the questions
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  #28  
Old 01-03-2011, 06:45 PM
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Re: Savage 308 /175 SMK - Bullet Drop Question

Quote:
Originally Posted by KPB71 View Post
SBruce So is the 6.28 and 6.0 moa


Sorry for all the questions
That's alright,

6.28" at 600yds is 1 true moa. 6" at 600 yds is one "shooters moa".

As you can see, shooters moa is easier to use........no decimal places. But for most circumstances, they are virtually the same.

If I were you, in your situation; I'd just run with the 3 IPHY spacing your scope seems to have (on 20X) It's easier to figure than dialing down your scope to where it's true mils.............see what I mean by reading my post on another thread.

FFP and SFP and ranging

Last edited by SBruce; 01-03-2011 at 06:54 PM.
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