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Savage 308 /175 SMK - Bullet Drop Question

 
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  #1  
Old 01-01-2011, 09:19 PM
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Join Date: Jul 2006
Location: West Jordan,Utah
Posts: 37
Savage 308 /175 SMK - Bullet Drop Question

Question~

This is kind of long (sorry), but I have included all the info I hope.

I was out shooting today using a

Savage 10 FCP HS precision
1:10 twist and 24" barrel

W/ Scope:
Leupold Mark 4 LR/T M1
Mildot 6.5-20x50

Bullet:
175 smk B.C. .496

Lapua Brass

CCI/BR2

Powder:
Varget 44.8 gr.

I was shooting at 600 yards, temperature was about 5 degrees w/ no wind. The gun is zeroed at 200 yards. The scope was set at max power (20x).

Noslers reloading guide drop table indicates that the drop for 600 yards at a velocity of 2700 fps should be -82.5.

I set up a target marking the -82.5 drop, however, in order to hit the mark I had to use the 2nd mildot down in order to make the target instead of the 4th mildot.

What should the bullet drop be at that distance based on the information above?
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  #2  
Old 01-01-2011, 09:42 PM
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Join Date: Oct 2009
Location: Thunder Basin, WY
Posts: 1,788
Re: Savage 308 /175 SMK - Bullet Drop Question

Hold over should be anywhere from 3 1/4 to 4 mils, depending on your altitude............but you were making hits at 600 with only 2 mil holdover??

Something is waaay off there. You would have to be shooting somewhere in the velocity range of 3500'/sec to use a 2 mil hold at 600 yds, according to the NF ballistic program.

Other possibilities are scopes' zero shifted, scope moved in the rings, resting the barrel on something??

Are you absolutely sure you were using 2 mils, and not 4??
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  #3  
Old 01-01-2011, 09:53 PM
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Join Date: Jul 2006
Location: West Jordan,Utah
Posts: 37
Re: Savage 308 /175 SMK - Bullet Drop Question

Sbruce, The scope has four dots down and four across and i was on the 2nd one down what if i was zeroed at 300yards and not 200


thanks Kenny
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  #4  
Old 01-01-2011, 10:40 PM
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Join Date: Oct 2009
Location: Thunder Basin, WY
Posts: 1,788
Re: Savage 308 /175 SMK - Bullet Drop Question

Quote:
Originally Posted by KPB71 View Post
Sbruce, The scope has four dots down and four across and i was on the 2nd one down what if i was zeroed at 300yards and not 200

thanks Kenny
Even zero'd at 300, drop would still be around 3 mils assuming 2700'/sec.

Maybe look through the scope at a 100 yd target.......make sure there's 3.6" from the center of one dot to the center of the next dot. If there's alot more space then the scope isn't in mils. and needs to be sent back to leupold or you'll need to learn what it really is in.
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  #5  
Old 01-01-2011, 10:52 PM
Bronze Member
 
Join Date: Apr 2010
Posts: 43
Re: Savage 308 /175 SMK - Bullet Drop Question

Quote:
Originally Posted by KPB71 View Post
Question~

This is kind of long (sorry), but I have included all the info I hope.

I was out shooting today using a

Savage 10 FCP HS precision
1:10 twist and 24" barrel

W/ Scope:
Leupold Mark 4 LR/T M1
Mildot 6.5-20x50

Bullet:
175 smk B.C. .496

Lapua Brass

CCI/BR2

Powder:
Varget 44.8 gr.

I was shooting at 600 yards, temperature was about 5 degrees w/ no wind. The gun is zeroed at 200 yards. The scope was set at max power (20x).

Noslers reloading guide drop table indicates that the drop for 600 yards at a velocity of 2700 fps should be -82.5.

I set up a target marking the -82.5 drop, however, in order to hit the mark I had to use the 2nd mildot down in order to make the target instead of the 4th mildot.

What should the bullet drop be at that distance based on the information above?
If I'm correct you had an aiming point 82.5" above your expected impact point. Is this true? If you then had to hold an additional 2 Mils above the aiming point to hit the expected impact point. I would expect your velocity is not quite in line with the manual. The environmentals you fired in most likely don't match the manuals corrected environmentals either.
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  #6  
Old 01-01-2011, 11:40 PM
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Join Date: Jul 2007
Location: Arkansas
Posts: 1,174
Re: Savage 308 /175 SMK - Bullet Drop Question

Sounds like your zero is more along the lines of 400!
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  #7  
Old 01-02-2011, 02:32 AM
Silver Member
 
Join Date: Sep 2010
Location: So. California
Posts: 408
Re: Savage 308 /175 SMK - Bullet Drop Question

I do not think you were looking up the actual drop table for an Sierra Match King bullet. Pretty sure the drop tables in that manual are for nosler bullets, which can be a bit different.

I would fire up JBM:
JBM
And see what it says. Also measure from center of scope body to center of bore line and see how far above center your scope is mounted. Input that measurement into JBM instead of the default 1.5". It makes a difference on drop tables, and it is a very common mistake people make.

Good shooting,
Gary
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