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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Confusion on My Ballistics
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<blockquote data-quote="craigp40" data-source="post: 78409" data-attributes="member: 3327"><p>I need some help. I've been working up some loads for the rifle Chris Matthews built for me (7mm RM with 26" Broughton 7.75 and A5 stock). I found a pretty good load using 175 SMKs and RL-22 that very consistently prints at least in the 3's and better when I don't screw it up. </p><p></p><p>Here's my problem: I zeroed the rifle at 100yds. According to my ballistics program, 3.4 MOA should get me to 300. When I actually shoot it, it only takes me 2.5 MOA. This doesn't make sense to me. I know the charts aren't perfect, but I have never had one this far off. The physics of it should be fairly close. I admit, not the worst problem to have, but how in the hell can I make up drop charts without shooting at every 50 yd increment between 100 and 1500 yards? The scope I have is a new Nikon Tactical 4-16. I plan to do a box test with it to verify its calibration, but anything else I should be looking at or doing?</p><p></p><p>In case you wondered, here are the numbers I am using to calculate it:</p><p></p><p>Bullet weight: 175</p><p>BC: 0.608</p><p>Scope height: 1.80</p><p>Velocity: 2934</p><p>Alt: 800 ft</p><p>Zero range: 100yds</p></blockquote><p></p>
[QUOTE="craigp40, post: 78409, member: 3327"] I need some help. I've been working up some loads for the rifle Chris Matthews built for me (7mm RM with 26" Broughton 7.75 and A5 stock). I found a pretty good load using 175 SMKs and RL-22 that very consistently prints at least in the 3's and better when I don't screw it up. Here's my problem: I zeroed the rifle at 100yds. According to my ballistics program, 3.4 MOA should get me to 300. When I actually shoot it, it only takes me 2.5 MOA. This doesn't make sense to me. I know the charts aren't perfect, but I have never had one this far off. The physics of it should be fairly close. I admit, not the worst problem to have, but how in the hell can I make up drop charts without shooting at every 50 yd increment between 100 and 1500 yards? The scope I have is a new Nikon Tactical 4-16. I plan to do a box test with it to verify its calibration, but anything else I should be looking at or doing? In case you wondered, here are the numbers I am using to calculate it: Bullet weight: 175 BC: 0.608 Scope height: 1.80 Velocity: 2934 Alt: 800 ft Zero range: 100yds [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Confusion on My Ballistics
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