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Rifles, Reloading, Optics, Equipment
Reloading
.223 bolt action 600 yd
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<blockquote data-quote="Hand Skills" data-source="post: 1430042" data-attributes="member: 103303"><p>[USER=92888]@TMill308[/USER] Interesting, I didn't realize 77gr smk was designed specifically with mag length in mind. That's good to know. They list a relatively low BC of .362, so I never considered them. By comparison, 75gr ELD-M has a BC of .460. </p><p></p><p>It's always windy here, so I've been focusing on 'heavies' w/ BC's >.400, but I should have qualified my previous post with that. </p><p></p><p>[USER=71293]@ncwg2boatguy[/USER] It's great that you are shooting factory the amax that consistently. At mag length I haven't got them to group better than ~1moa. I'm considering a couple of modified mags so I can use ~2.47 oacl. </p><p></p><p>Out past 300m, the BC really makes a difference. Here is my range card with 75gr ELD-M (verified)</p><p></p><p>[ATTACH]95760[/ATTACH] </p><p></p><p>Here is my calculator's guess for a 77gr smk at the same velocity, in the same conditions (unverified);</p><p>[ATTACH]95761[/ATTACH] </p><p></p><p>My data is metric, but comparing the two at 550m (~600yd) a 10mph crosswind moves the smk's POI 30% (roughly 12") farther than the ELD-M.</p></blockquote><p></p>
[QUOTE="Hand Skills, post: 1430042, member: 103303"] [USER=92888]@TMill308[/USER] Interesting, I didn't realize 77gr smk was designed specifically with mag length in mind. That's good to know. They list a relatively low BC of .362, so I never considered them. By comparison, 75gr ELD-M has a BC of .460. It's always windy here, so I've been focusing on 'heavies' w/ BC's >.400, but I should have qualified my previous post with that. [USER=71293]@ncwg2boatguy[/USER] It's great that you are shooting factory the amax that consistently. At mag length I haven't got them to group better than ~1moa. I'm considering a couple of modified mags so I can use ~2.47 oacl. Out past 300m, the BC really makes a difference. Here is my range card with 75gr ELD-M (verified) [ATTACH]95760[/ATTACH] Here is my calculator's guess for a 77gr smk at the same velocity, in the same conditions (unverified); [ATTACH]95761[/ATTACH] My data is metric, but comparing the two at 550m (~600yd) a 10mph crosswind moves the smk's POI 30% (roughly 12") farther than the ELD-M. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
.223 bolt action 600 yd
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