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Rifles, Reloading, Optics, Equipment
Reloading
First time ladder test
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<blockquote data-quote="Greyfox" data-source="post: 1426199" data-attributes="member: 10291"><p>I have had excellent results extrapolating my 200 yard ladder data to 1000 yard performance with several rifles, particularly with the advances in chronographs that deliver accurate velocity(Magnetospeed/LabRadar). It used to be luck when using optical chronographs...at least for me. I believe that this is where the choice of bullet makes a big difference. When 1000 yard results didn't extrapolate or accuracy fell off, it was generally a bullet change or (BC adjustment) that was required. For long range shooting it's very important to select a well proven bullet with solid ballistic information. With a stable bullet, the physics of (an accurately measured) velocity and angular dispersion aren't going to change, other then the effects of wind/air density. The vertical dispersion at 1000 yards will be more pronounced due to the velocity/charge weight for a given load. This is generally going to be in the 5FPS/.1gr range. At 1000 yards the vertical dispersion will be, at the very least equal to the point of impact change due to the change(or spread) in velocity(ex. 1.0gr change in charge=50FPS). With my 6.5x47 this is about 12". My ES for my load is 10 FPS which does give me an average 1000 yard vertical of <3". While I'll certainly test and fine tune at long range, load development/ladder testing at 1000 yards IMO is un-necessary and quite cumbersome due to environmental factors. </p><p>This is a recent 200 yard ladder and final load that was chosen for my PRS rifle in 6.5x47. Results correlate to 1000 yards.[ATTACH=full]94968[/ATTACH][ATTACH=full]94969[/ATTACH]</p></blockquote><p></p>
[QUOTE="Greyfox, post: 1426199, member: 10291"] I have had excellent results extrapolating my 200 yard ladder data to 1000 yard performance with several rifles, particularly with the advances in chronographs that deliver accurate velocity(Magnetospeed/LabRadar). It used to be luck when using optical chronographs...at least for me. I believe that this is where the choice of bullet makes a big difference. When 1000 yard results didn’t extrapolate or accuracy fell off, it was generally a bullet change or (BC adjustment) that was required. For long range shooting it’s very important to select a well proven bullet with solid ballistic information. With a stable bullet, the physics of (an accurately measured) velocity and angular dispersion aren’t going to change, other then the effects of wind/air density. The vertical dispersion at 1000 yards will be more pronounced due to the velocity/charge weight for a given load. This is generally going to be in the 5FPS/.1gr range. At 1000 yards the vertical dispersion will be, at the very least equal to the point of impact change due to the change(or spread) in velocity(ex. 1.0gr change in charge=50FPS). With my 6.5x47 this is about 12”. My ES for my load is 10 FPS which does give me an average 1000 yard vertical of <3”. While I’ll certainly test and fine tune at long range, load development/ladder testing at 1000 yards IMO is un-necessary and quite cumbersome due to environmental factors. This is a recent 200 yard ladder and final load that was chosen for my PRS rifle in 6.5x47. Results correlate to 1000 yards.[ATTACH=full]94968[/ATTACH][ATTACH=full]94969[/ATTACH] [/QUOTE]
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Reloading
First time ladder test
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