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Long range ammo

 
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  #8  
Old 01-11-2011, 09:11 PM
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Join Date: Oct 2009
Location: Thunder Basin, WY
Posts: 1,788
Re: Long range ammo

What kind of mods have you done to your rifle so far, if any?

Is it a factory barrel/action/trigger? Has it been bedded? Some more info would help on getting back positive responses.

I am not trying to be a smartass, but I feel the need to correct your question:
I am curious if there is a factory loaded round that I can purchase that has consistant BC ( balistic coeficient) out of the box.

BC is determined by the bullet itself, and how well it flies through the air. Higher BC = less drag during flight. The brand of ammo really has no effect on consistant BC (assuming they are using quality bullets). ES and SD are another story however. Different ammo will produce better or worse Extreme Spread & Standard Deviation which will affect your ability to hit a target at long distance. If the velocity (which is what ES and SD are indicating) varies shot to shot by too much, then the impact on target will vary shot to shot too.

Once again not trying to put you down, just tryin to let you know the terminology.

Good Luck 2U.


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  #9  
Old 04-02-2011, 11:32 AM
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Join Date: Apr 2011
Posts: 20
Re: Long range ammo

The man said he is " shooting a .308 out of a remington 700 base with a 26" barrel having a 1 in 12 twist "

125 to 160 gr bullets usually shoot better in a 1 in 10 " twist.

170 to 200 grain bullets fare better with 1 in 12 " twists

Also bullet length in increments of 10 / 1,000ths can offset any inconsistencies in 5 shot 100 yd groups.

I have one rifle that prefers 2.827 " OAL and the other 2.850" , both barrels being 1 in 9 1/4 " twists.

I am now breaking in a new 700 with a SHILEN 1 in 9 " twist

I shoot 7MM-08 out to 1,000 yds using AMAX 162 gr ,Sierra Match King 160 gr and Berger 168 gr Boat Tail propelled by H 414 powder and Magnum primers.
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