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zeroing the ss

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/04/2006 at 21:11
mike1113 View Drop Down
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Say i zero in my ss at 100 yrds. How many chick would 200 AND 300yrds be? 

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/05/2006 at 08:07
Henry455 View Drop Down
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Depends on the type ammunition you are shooting. If its commercial ammo, you can go to the manufacturer's website and find balllistic tables that will show how much drop there is at 200 and 300 yds for your particular cartridge, if sighted in at 100. Remember each click equals approx. 1/4" at 100 yds., 1/2" at 200 yds. and 3/4" at 300 yds.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/05/2006 at 22:35
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Give me a little info like Caliber , Bullet weight , Brand and BC ( ballistic coefficient ) of your bullet , FPS ( Speed ) and the altitude you shoot at.

I might be able to get you very close out to 500yds.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/06/2006 at 10:06
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http://www.gunsandammomag.com/ballistics/

http://www.snipercentral.com/308.htm

 

If each click moves it 1/4 inch at 100 yds then each click moves it 1/2 inch at 200 yds  and so on because one moa is 1 inch at 100  or  2 inches at 200  or 3 inches at 300 then you take that 3 inches and divide by 4 and come up with 3/4 in per click at 300 yds.  ( there is a more complicated way of saying this but this works)

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/06/2006 at 13:14
Mike McDonald View Drop Down
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moa is 1.047 inches per 100 yards.   It makes a difference as you get farther out.. 


Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/08/2006 at 11:57
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I am using Winchester 147gr USA .308 factory ammo. Coefficient is: 0.415 oh and I have a 20" barrel (Rem 700LTR)

I have the ballistics information from the site, but not 100% sure how to translate it into the proper amount of clicks
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/08/2006 at 18:37
Mike McDonald View Drop Down
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Do not think "clicks".  You'll get turned around in no time at all.
Scope adjustments are in MOA, Minute Of Angle.

If you use a ballistics calculator that gives inches of drop from a 100 yard zero, divide each range by 1.047 to get moa.
Best way to get the data is get off the internet and shoot at each desired range, recording the required come up per range and begin building your database.  Sorry, I'm very much old school on the subject of internet marksmanship.

For the 308 the average come up from a 100 yard zero is 2 moa to get to 200 yards, and adding 3 to 3.5 moa at each consecutive distance until 700 yards, after which add 4 to 4.5 moa per 100 yard increment.
These increments will not gaurantee a center shot each time but will get you on paper so you can measure group size and placement for proper correction.

With 147 grain ball ammo you may as well forget about precision shooting, further handicapped by that 20 inch barrel.

Realisticly you need to consider 2 moa  and 700 yards a decent average for that combo.


Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/08/2006 at 18:45
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Listen to what Mike says.  He tends to know what he is talking about.

Ballistic calculators and such a very useful to help you get into the ballpark, but you have to actually shoot and take notes to really zero in on the drop correction values.

ILya
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/08/2006 at 19:18
cerickson View Drop Down
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Yea, the 147gr ammo is just for breaking the gun in, then I am switching to handloads.

I will be manually figuring out the required moa for distances plus I managed to track down some software that figures it all out as well. I am curious as to how accurate the guide will be.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/09/2006 at 17:04
mike1113 View Drop Down
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So what bullets would be best?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/09/2006 at 21:18
Mike McDonald View Drop Down
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In a factory remington  20 inch tube bullet choice is pretty much dependant on the mission.

Anything heavier than a 175 is ruled out since there's not enough barrel ( by about 4 inches) to generate enough velocity to make the added recoil worthwhile.

After that, 168's due to the accuracy at short and intermediate range, and 175's if you just want to push the limits of range -v- velocity in the factory tube.

I know the very first bullets I'd shoot thru that tube were it mine, and that's Davidf Tubbs Final Finish kit.
Best thing that ever happened to a factory barrel.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/09/2006 at 23:11
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Mike

 

Do those David Tubbs bullets actually work that good?  I've seen them advertised before but haven't given them too much thought.  How did they work in your barrel (improve accuracy, decrease fouling etc?)  Can you use them on a barrel that has already been broken in? 

 

 

Thanks

 

Yotecaller1

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/10/2006 at 08:40
Mike McDonald View Drop Down
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The Tubb final finish kit helps remove the factory reamer marks, as you know most factory barrels are not lapped, and the FF kit
does this to some degree.

Benefits of doing this are;
Easier cleaning
increased accuracy due in part to less jacket deformation and smoother transition into the rifling at the throat.

Downside of using the kit is that the factory barrel is now alot smoother so you'll experience some reduction in available velocity.
the reduction in cleaning difficulty and increased accuracy more than make up for this.

I also use the finer grits to break in my hand lapped match barrels, and use the finest grit every 250 rounds in my match barrels to maintain the throat area.  Tubb makes a kit specific to this purpose called TMS, or throat maintneance  system.
Using this kit prolongs the accurate life of a good barrel.

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