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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
JLK VLDs?
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<blockquote data-quote="MontanaRifleman" data-source="post: 279790" data-attributes="member: 11717"><p>Thanks again for the response Bryan,</p><p> </p><p>I had thought about the cautions you mentioned and I will definitely be sure I am shooting a tight group at 300 yds before I try shooting through a chrono at that range. I will also use the "old" chrono down range <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" /> But as of yet, I only have one chrono and a second one is on the wish list along with a lot of other things including picatiny rail and rings for my Sendero, a good range finder (currently have a Nikon that is good to about 700-800 yds) Harris bi pod, etc., etc. With business being slow it could take all summer to get all the pieces together and I was hoping to be there by now.... but I digress....</p><p> </p><p>So if anyone wants to meet me at the Logan range and bring their chrony along, we could do some BC testing.</p><p> </p><p>Yup, I sure will share the results if and when I do it, and I do want to do it.</p><p> </p><p>Couple of questions on the JBM calc...</p><p> </p><p>1) What's the difference between absolute and corrected pressure? I think I know but would like to hear from you and what do I use?</p><p> </p><p>2) What does drag profile have to do with calculating the BC? I noticed that ii I changed the drag profile form G1 to G7 it drastically changed the BC even if I left everything else the same such as distance and velocities, near and far. This doesn't seem right to me so I must be missing something.</p><p> </p><p>Also, a good article, but the graphs block some of the text.</p><p> </p><p>Thanks,</p><p> </p><p>Mark</p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 279790, member: 11717"] Thanks again for the response Bryan, I had thought about the cautions you mentioned and I will definitely be sure I am shooting a tight group at 300 yds before I try shooting through a chrono at that range. I will also use the "old" chrono down range :D But as of yet, I only have one chrono and a second one is on the wish list along with a lot of other things including picatiny rail and rings for my Sendero, a good range finder (currently have a Nikon that is good to about 700-800 yds) Harris bi pod, etc., etc. With business being slow it could take all summer to get all the pieces together and I was hoping to be there by now.... but I digress.... So if anyone wants to meet me at the Logan range and bring their chrony along, we could do some BC testing. Yup, I sure will share the results if and when I do it, and I do want to do it. Couple of questions on the JBM calc... 1) What's the difference between absolute and corrected pressure? I think I know but would like to hear from you and what do I use? 2) What does drag profile have to do with calculating the BC? I noticed that ii I changed the drag profile form G1 to G7 it drastically changed the BC even if I left everything else the same such as distance and velocities, near and far. This doesn't seem right to me so I must be missing something. Also, a good article, but the graphs block some of the text. Thanks, Mark [/QUOTE]
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