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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Let's argue about BC's
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<blockquote data-quote="Buffalobob" data-source="post: 479894" data-attributes="member: 8"><p>Montanarifleman</p><p></p><p>You asked a question and I have been repairing a 1936 Crane Dial Eze for the last three days so my attention wanders to why 40 psi needs tight nuts over good washers. It is at least as nasty of a job as finding a bullet BC.</p><p></p><p>So here is the process I used to come up with an allowable 13 % erro in BC with my stuff where I hunt in Wyoming.</p><p></p><p>Here is what I did.</p><p>If one assumes that an antelope has a kill zone of one MOA at 1000 yards then we can make some simple calculations concerning BC error. I used my antelope because it just happened to be a really high but fatal strike and I wished to prove that there is a reality to long range hunting and that if you have a very good rifle and are reasonably competent there is a lot of slop/error that can be tolerated. </p><p></p><p>Take your favorite combination of bullet and rifle and your favorite ballistics calculator and enter the conditions which usually exist when hunting antelope. Runs those for 1000 yards and record the drop and the BC that you used. Then keeping all conditions the same increase (or decrease) your BC until you have your bullet striking exactly one MOA different at 1000 yards. Then compare the starting BC with the ending BC. That is the percent error allowable in BC.</p><p></p><p>If you really want to see some big numbers assume you are shooting at an elk and use a 2 MOA kill zone and see what your BC error can be. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p><p></p><p>Obviously if you favorite rifle is a 30-30 you will have used up all of your error at 1000 yards before you even load it. This brings us full circle to the reason Kirby developed the Allen Mags. So sloppy people like me could make spectacular looking shots at long range. Lots and lots of speed combined with high BC covers up a lot of mistakes.</p></blockquote><p></p>
[QUOTE="Buffalobob, post: 479894, member: 8"] Montanarifleman You asked a question and I have been repairing a 1936 Crane Dial Eze for the last three days so my attention wanders to why 40 psi needs tight nuts over good washers. It is at least as nasty of a job as finding a bullet BC. So here is the process I used to come up with an allowable 13 % erro in BC with my stuff where I hunt in Wyoming. Here is what I did. If one assumes that an antelope has a kill zone of one MOA at 1000 yards then we can make some simple calculations concerning BC error. I used my antelope because it just happened to be a really high but fatal strike and I wished to prove that there is a reality to long range hunting and that if you have a very good rifle and are reasonably competent there is a lot of slop/error that can be tolerated. Take your favorite combination of bullet and rifle and your favorite ballistics calculator and enter the conditions which usually exist when hunting antelope. Runs those for 1000 yards and record the drop and the BC that you used. Then keeping all conditions the same increase (or decrease) your BC until you have your bullet striking exactly one MOA different at 1000 yards. Then compare the starting BC with the ending BC. That is the percent error allowable in BC. If you really want to see some big numbers assume you are shooting at an elk and use a 2 MOA kill zone and see what your BC error can be. :D Obviously if you favorite rifle is a 30-30 you will have used up all of your error at 1000 yards before you even load it. This brings us full circle to the reason Kirby developed the Allen Mags. So sloppy people like me could make spectacular looking shots at long range. Lots and lots of speed combined with high BC covers up a lot of mistakes. [/QUOTE]
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