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The Basics, Starting Out
Complete LRH Virgin - 338 Lapua Magnum - Expertise Requested!
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<blockquote data-quote="Bullet bumper" data-source="post: 659068" data-attributes="member: 17844"><p>If you are using factory bullets from the big manufacturers then they will supply a ballistic coefficient or several coefficients and velocity boundaries for that bullet some also supply the best drag function for that shape bullet .</p><p>If you are hand-loading then you will need to chronograph your loads .</p><p>To get an average velocity that you can enter in a ballistic program along with the BC's and any velocity boundaries or drag function that you may have . </p><p>long range shooting can get very complicated and expensive if you have too many different loads with different BC's and trajectories .</p><p>You will need to test some popular bullets and out of the batch select one or two that show the most promise , then concentrate on tuning the load to shoot the best with them . Once you have a load that shoots well at closer range you can chronograph it and then model it in a ballistic program to see how well it holds velocity at longer ranges and that gives you an idea of the range where it goes subsonic and it's likely trajectory at the current atmospheric conditions etc .</p><p>You will need to buy a chronograph a CED M2 is quite good. </p><p>An I-pod touch running the ballistic applications " shooter " or JBM ballistics FTE is quite good and not that expensive.</p><p>A Leica range finder is an accurate device.</p><p>Once you have some accurate trajectory data on your load you can move out and start testing the loads at longer range . The trajectory data helps you get onto a target and produce a group . </p><p>If a bullet has a High BC and a reputation for long range accuracy then if it is tuned at say 100 to 300 yards and it's shooting tight groups then it is fair to say that it will still shoot well at longer range as long as it stays super sonic and as long as wind or shooter error is not an issue , some might even shoot ok right through the transonic zone and after . </p><p>You have to start at shorter range first when it is all new as it is hard to develop and prove accuracy at long range straight up without wasting a lot of ammo , when wind is such a big variable .</p><p>To simplify you aiming technique I would dial for elevation and then hold off on the reticule for wind. This way you can adjust your wind hold quickly if the wind condition changes and you see a miss , once you have the elevation right . The range to a static target does not change but the wind sure does. Hope that helps . I am ex Military also ex Vietnam infantry , trained as a sniper but never deployed as one . They even confiscated my weapon when I was away on leave and it was my personal property not the Armies . Their rifle did not shoot well enough and I left it in the armoury and built my own through a local accuracy gunsmith . I reckon the bast*rds did it purposely because I was showing up what crap their rifles were. Anyway I never got my gun back and it broke my heart and I never had that kind of dedication for the Army ever again after that . </p><p>That was a long time ago and it is all changed now for the better .</p></blockquote><p></p>
[QUOTE="Bullet bumper, post: 659068, member: 17844"] If you are using factory bullets from the big manufacturers then they will supply a ballistic coefficient or several coefficients and velocity boundaries for that bullet some also supply the best drag function for that shape bullet . If you are hand-loading then you will need to chronograph your loads . To get an average velocity that you can enter in a ballistic program along with the BC's and any velocity boundaries or drag function that you may have . long range shooting can get very complicated and expensive if you have too many different loads with different BC's and trajectories . You will need to test some popular bullets and out of the batch select one or two that show the most promise , then concentrate on tuning the load to shoot the best with them . Once you have a load that shoots well at closer range you can chronograph it and then model it in a ballistic program to see how well it holds velocity at longer ranges and that gives you an idea of the range where it goes subsonic and it's likely trajectory at the current atmospheric conditions etc . You will need to buy a chronograph a CED M2 is quite good. An I-pod touch running the ballistic applications " shooter " or JBM ballistics FTE is quite good and not that expensive. A Leica range finder is an accurate device. Once you have some accurate trajectory data on your load you can move out and start testing the loads at longer range . The trajectory data helps you get onto a target and produce a group . If a bullet has a High BC and a reputation for long range accuracy then if it is tuned at say 100 to 300 yards and it's shooting tight groups then it is fair to say that it will still shoot well at longer range as long as it stays super sonic and as long as wind or shooter error is not an issue , some might even shoot ok right through the transonic zone and after . You have to start at shorter range first when it is all new as it is hard to develop and prove accuracy at long range straight up without wasting a lot of ammo , when wind is such a big variable . To simplify you aiming technique I would dial for elevation and then hold off on the reticule for wind. This way you can adjust your wind hold quickly if the wind condition changes and you see a miss , once you have the elevation right . The range to a static target does not change but the wind sure does. Hope that helps . I am ex Military also ex Vietnam infantry , trained as a sniper but never deployed as one . They even confiscated my weapon when I was away on leave and it was my personal property not the Armies . Their rifle did not shoot well enough and I left it in the armoury and built my own through a local accuracy gunsmith . I reckon the bast*rds did it purposely because I was showing up what crap their rifles were. Anyway I never got my gun back and it broke my heart and I never had that kind of dedication for the Army ever again after that . That was a long time ago and it is all changed now for the better . [/QUOTE]
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