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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Best bdc turret
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<blockquote data-quote="LouBoyd" data-source="post: 427550" data-attributes="member: 9253"><p>I find it difficult to understand why anyone would want a scope with Ballistic Drop Compensation (BDC) knobs, whether they're custom or not. They can only be correct for one rfile, one load, and one atmospheric condition. Everything is is approximate. BDC knobs don't help in determining range or wind. You still have to twiddle the knobs for each change in distance and wind. </p><p></p><p>I can understand using a custom BDC reticle so you don't have to change knob settings. Or you can use a "factory" BDC reticle and adjust your loads to match the reticle. The Zeiss Z system attempts to match one reticle to many cartridges using variable magnification which sort of works. You still have to measure, estimate, or guess the range and wind velocity but doesn't require frequent references to a lookup card or calculator. </p><p></p><p>My favorite system is a mil grid reticle such as used by Horus Optics. It does require a lookup table or calculator for drop and wind deflection, but it is accurate for any rifle/cartridge/atmosphere and doesn't require knob twiddling other than zeroing it. </p><p></p><p>I can't offer advise on currently available BDC Turrets. The only BDC turret I've used which I thought was reasonable was on a Leatherwood Vietnam era scope. It was calibrated in yards but the associated drop was adjustable with a flexible cam and set screws. At least it could be set to match a rifle/cartidge/atmosphere (within it's limits) but it took some effort to adjust the settings correctly. It still required knob twiddling for each shot.</p></blockquote><p></p>
[QUOTE="LouBoyd, post: 427550, member: 9253"] I find it difficult to understand why anyone would want a scope with Ballistic Drop Compensation (BDC) knobs, whether they're custom or not. They can only be correct for one rfile, one load, and one atmospheric condition. Everything is is approximate. BDC knobs don't help in determining range or wind. You still have to twiddle the knobs for each change in distance and wind. I can understand using a custom BDC reticle so you don't have to change knob settings. Or you can use a "factory" BDC reticle and adjust your loads to match the reticle. The Zeiss Z system attempts to match one reticle to many cartridges using variable magnification which sort of works. You still have to measure, estimate, or guess the range and wind velocity but doesn't require frequent references to a lookup card or calculator. My favorite system is a mil grid reticle such as used by Horus Optics. It does require a lookup table or calculator for drop and wind deflection, but it is accurate for any rifle/cartridge/atmosphere and doesn't require knob twiddling other than zeroing it. I can't offer advise on currently available BDC Turrets. The only BDC turret I've used which I thought was reasonable was on a Leatherwood Vietnam era scope. It was calibrated in yards but the associated drop was adjustable with a flexible cam and set screws. At least it could be set to match a rifle/cartidge/atmosphere (within it's limits) but it took some effort to adjust the settings correctly. It still required knob twiddling for each shot. [/QUOTE]
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Best bdc turret
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