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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Scope Levels- Why?
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<blockquote data-quote="Pro2A" data-source="post: 1892275" data-attributes="member: 17889"><p>Just read Ryan's book also. Interesting entry info. Did your book's binding fall apart like mine??? Looking forward to his sequel due out this year. Just because available bubble levels are not precise doesn't mean cant should be ignored as big source of inaccuracy.....all increments are additive yielding cumulative misses. Consistency is King. Frank Galli, when quizzed at 2018 Precision Rifle Expo at Arena Training Facility in SW GA, said he "didn't need one".....and couldn't/declined to offer any advice for we mere mortal trigger pullers who haven't been taxpayer funded to send a bazillion rounds down range. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> As a mere mortal trigger puller, I find very useful the SendIt! digital level (~$230 at Brownells.com) attaches to picatinny rail. Choose from any of 5 sensitivities down to 0.1deg; 5 LEDs....2 Red/2 blue LEDs = cant; center green = Send It!. (Note: 0.1deg cant LEDs can drive you crazy worse than the wandering reticle.) Mount horizontal or vertical. High peripheral visibility without lifting from optic....no need to "read" bubble. Works for me. Also, I have several Sig Tango6 5-30x56 with their Level-Plex digital level. Selectable precision, I recall between 1deg to o.1deg. Really nice as the level indicator is in the optic....no lifting to "read" a bubble. Machinist bubble levels (ie. Starrett...) can be very precise....gettin' really, really old...forget the specs, but no mount for rifle available anyway. Haven't machined mount; still difficult to read peripherally without lifting. Checked against machinist level or indicated on mill, most shooting bubble (Vortex, NF, Accuracy 1st,...) levels are in the 1-3deg accuracy range. Seems bubble benefit is largely in keeping shooter aware of cant issue....first step to resolving an issue is being aware of issue.......and maybe a little Tacticool.....play with your opponent's mind. Bryan Litz, Applied Ballistics, in Chapter 8: Leveling Your Sights in his book Accuracy and Precision For Long Range Shooting - A Practical Guide For Riflemen, relates studies show that without an accurate reference, average individuals are hard pressed to resolve cant +/- 3deg with unaided eye. That is big impact at long range.....500 - 1000yds out. Litz's Fig 8.2 page 95 plots horizontal and vertical error of 3deg cant for .243 and .308 as roughly 3-4.5" horizontal/0.1" vertical @ 500yds; 1000yds = 16-25" H/0.4-0.6" V ; 1500yds = 41-66" H/ 1-7" V. Worth addressing??? Really major contribution to misses. Most error is obviously horizontal which also compounds the reading wind issues. Cant typically gets mis-read as wind errors. Many field visual references....telephone poles, fence posts, trees, etc can be sneaky vertical illusion. Just an old guy's ponderings.</p></blockquote><p></p>
[QUOTE="Pro2A, post: 1892275, member: 17889"] Just read Ryan's book also. Interesting entry info. Did your book's binding fall apart like mine??? Looking forward to his sequel due out this year. Just because available bubble levels are not precise doesn't mean cant should be ignored as big source of inaccuracy.....all increments are additive yielding cumulative misses. Consistency is King. Frank Galli, when quizzed at 2018 Precision Rifle Expo at Arena Training Facility in SW GA, said he "didn't need one".....and couldn't/declined to offer any advice for we mere mortal trigger pullers who haven't been taxpayer funded to send a bazillion rounds down range. :) :) :) As a mere mortal trigger puller, I find very useful the SendIt! digital level (~$230 at Brownells.com) attaches to picatinny rail. Choose from any of 5 sensitivities down to 0.1deg; 5 LEDs....2 Red/2 blue LEDs = cant; center green = Send It!. (Note: 0.1deg cant LEDs can drive you crazy worse than the wandering reticle.) Mount horizontal or vertical. High peripheral visibility without lifting from optic....no need to "read" bubble. Works for me. Also, I have several Sig Tango6 5-30x56 with their Level-Plex digital level. Selectable precision, I recall between 1deg to o.1deg. Really nice as the level indicator is in the optic....no lifting to "read" a bubble. Machinist bubble levels (ie. Starrett...) can be very precise....gettin' really, really old...forget the specs, but no mount for rifle available anyway. Haven't machined mount; still difficult to read peripherally without lifting. Checked against machinist level or indicated on mill, most shooting bubble (Vortex, NF, Accuracy 1st,...) levels are in the 1-3deg accuracy range. Seems bubble benefit is largely in keeping shooter aware of cant issue....first step to resolving an issue is being aware of issue.......and maybe a little Tacticool.....play with your opponent's mind. Bryan Litz, Applied Ballistics, in Chapter 8: Leveling Your Sights in his book Accuracy and Precision For Long Range Shooting - A Practical Guide For Riflemen, relates studies show that without an accurate reference, average individuals are hard pressed to resolve cant +/- 3deg with unaided eye. That is big impact at long range.....500 - 1000yds out. Litz's Fig 8.2 page 95 plots horizontal and vertical error of 3deg cant for .243 and .308 as roughly 3-4.5" horizontal/0.1" vertical @ 500yds; 1000yds = 16-25" H/0.4-0.6" V ; 1500yds = 41-66" H/ 1-7" V. Worth addressing??? Really major contribution to misses. Most error is obviously horizontal which also compounds the reading wind issues. Cant typically gets mis-read as wind errors. Many field visual references....telephone poles, fence posts, trees, etc can be sneaky vertical illusion. Just an old guy's ponderings. [/QUOTE]
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