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The Basics, Starting Out
Gadget needed, video camera type
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<blockquote data-quote="Dave King" data-source="post: 53363" data-attributes="member: 3"><p>Brent</p><p></p><p><strong>Dave, doesn't it offset the round from the "intended POI" (POA) by only 2.0 MOA, this is only at 100 yards though? </strong></p><p><strong></strong></p><p><strong>1.75 MOA is still needed for the POI and POA to intersect at 100 yards... true? Anything further (2 MOA more) would be the offset amount... true?</strong></p><p></p><p><strong>I think you're correct in the 200 yards situation. The initial 1.75 MOA needs to be considered here, and thus added to the 2 MOA additional come up for the new 200 yard zero... a total of 5.75 MOA, or 11.5" high from POA. </strong></p><p><strong></strong></p><p><strong>I may still be somewhat confused here... What would POI be in relation to POA at 125 yards? Interesting take on close range angled shots, never thought about it really. Thanks for the brain teaser Dave.</strong></p><p></p><p> As I understand it, there are two (2) major consideration when dealing with the rifles' "zero" setting (for me, 100 yards), the distance between center of the bore and the center of the sighting device (assume the sighting device is aligned above the bore) and the projectile's drop due to time of flight and gravitational forces. I believe my rifles need about 2 MOA of correction for "gravity" and 1.75 MOA for sight height. If you want to know the amount of correction required for your rifle to be POA to POI with a 100 yards zero try this (be careful or you'll put your eye out!). Cant the rifle 90 degrees to the side and shoot at a 100 yard target (use your 100 yard zero setting). Your POI should be displaced in two planes, lower and (left or right depending on the direction you canted). As I understand it, your rounds should be displaced equal amounts (this is the way it works for me) low and (right or left) and that amount os the amount required to "zero" the rifle in the normal shooting position. My 223 Rem displaces 3.5 inches low and 3.5 inches left (I'm right handed, I cant left), at 100 yards these inches nearly equate to MOA (1 vs 1.047). (It works out that when shooting from this position (skinny window scenario) I hold 1 Mil up (old left) and 1 Mil right (old high). As long as tou're out there, turn the rifle completely over (upside down) and shoot 100 yards. Your POI to POA will probably be about 7 inches low (2 Mil) if you're shooting a 223 or 308 class rifle.</p><p></p><p> If this all works out, you'll be ready to amaze you friends with your shooting "tricks". Let them try to shoot a target at 200 yards with the rifle upside down, there'll be a lot of dirt (snow up there maybe) flying. About 2.5 to 3 Mils "elevation," correction should get you pretty close.</p></blockquote><p></p>
[QUOTE="Dave King, post: 53363, member: 3"] Brent [B]Dave, doesn't it offset the round from the "intended POI" (POA) by only 2.0 MOA, this is only at 100 yards though? 1.75 MOA is still needed for the POI and POA to intersect at 100 yards... true? Anything further (2 MOA more) would be the offset amount... true?[/B] [B]I think you're correct in the 200 yards situation. The initial 1.75 MOA needs to be considered here, and thus added to the 2 MOA additional come up for the new 200 yard zero... a total of 5.75 MOA, or 11.5" high from POA. I may still be somewhat confused here... What would POI be in relation to POA at 125 yards? Interesting take on close range angled shots, never thought about it really. Thanks for the brain teaser Dave.[/B] As I understand it, there are two (2) major consideration when dealing with the rifles' "zero" setting (for me, 100 yards), the distance between center of the bore and the center of the sighting device (assume the sighting device is aligned above the bore) and the projectile's drop due to time of flight and gravitational forces. I believe my rifles need about 2 MOA of correction for "gravity" and 1.75 MOA for sight height. If you want to know the amount of correction required for your rifle to be POA to POI with a 100 yards zero try this (be careful or you'll put your eye out!). Cant the rifle 90 degrees to the side and shoot at a 100 yard target (use your 100 yard zero setting). Your POI should be displaced in two planes, lower and (left or right depending on the direction you canted). As I understand it, your rounds should be displaced equal amounts (this is the way it works for me) low and (right or left) and that amount os the amount required to "zero" the rifle in the normal shooting position. My 223 Rem displaces 3.5 inches low and 3.5 inches left (I'm right handed, I cant left), at 100 yards these inches nearly equate to MOA (1 vs 1.047). (It works out that when shooting from this position (skinny window scenario) I hold 1 Mil up (old left) and 1 Mil right (old high). As long as tou're out there, turn the rifle completely over (upside down) and shoot 100 yards. Your POI to POA will probably be about 7 inches low (2 Mil) if you're shooting a 223 or 308 class rifle. If this all works out, you'll be ready to amaze you friends with your shooting "tricks". Let them try to shoot a target at 200 yards with the rifle upside down, there'll be a lot of dirt (snow up there maybe) flying. About 2.5 to 3 Mils "elevation," correction should get you pretty close. [/QUOTE]
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The Basics, Starting Out
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