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Hunting
The Basics, Starting Out
Bullet drop compensation dials (BDC dials)
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<blockquote data-quote="7mmRHB" data-source="post: 108889" data-attributes="member: 3584"><p>Bart this is what Old Bear is getting at. If you run a program like Exbal or Sierra there are differances between the MOA and the bullet path or trajectory in inches. They do not match when you are useing a scope that tracks in 1" per min., 1/4" per click increments. Just for an example, a chart printed out on exbal for 25-06 ackly shows 14.75 MOA at 1000 yards. The trajectory or bullet path column shows 154.6" of drop. To find the true (inches) MOA so it matches the scope you take the bullet path in inches and divide by the inches per click at 1000 yrds (154.6 div. by 2.5 = 61.84 clicks) now divide that number by FOUR to get your scopes MOA which is 15.46 in this case. Now go back and look at the MOA column on the same chart and it says you need to come up 14.75 MOA to hit your target. Thats 7.5 inches diference on a flat shooting gun. If you take the 14.75 MOA figure and times it by 1.0472 it comes out at 15.446 MOA which shows that they are stll useing 1.0472 on their calculations while most scopes are in 1 inch moa. Sierras program is the same. If you want to make the proper turret corrections you better be using some math unless you are shooting with a scope that is in true 1.0472 MOA. Depending on the gun the corrections at 1k can be 3/4 to 1 1/4 Min.-----7mmRHB</p></blockquote><p></p>
[QUOTE="7mmRHB, post: 108889, member: 3584"] Bart this is what Old Bear is getting at. If you run a program like Exbal or Sierra there are differances between the MOA and the bullet path or trajectory in inches. They do not match when you are useing a scope that tracks in 1" per min., 1/4" per click increments. Just for an example, a chart printed out on exbal for 25-06 ackly shows 14.75 MOA at 1000 yards. The trajectory or bullet path column shows 154.6" of drop. To find the true (inches) MOA so it matches the scope you take the bullet path in inches and divide by the inches per click at 1000 yrds (154.6 div. by 2.5 = 61.84 clicks) now divide that number by FOUR to get your scopes MOA which is 15.46 in this case. Now go back and look at the MOA column on the same chart and it says you need to come up 14.75 MOA to hit your target. Thats 7.5 inches diference on a flat shooting gun. If you take the 14.75 MOA figure and times it by 1.0472 it comes out at 15.446 MOA which shows that they are stll useing 1.0472 on their calculations while most scopes are in 1 inch moa. Sierras program is the same. If you want to make the proper turret corrections you better be using some math unless you are shooting with a scope that is in true 1.0472 MOA. Depending on the gun the corrections at 1k can be 3/4 to 1 1/4 Min.-----7mmRHB [/QUOTE]
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Hunting
The Basics, Starting Out
Bullet drop compensation dials (BDC dials)
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