Roe Posted January 1, 2013 Author Report Share Posted January 1, 2013 Link , takes me to a photo album , kammet ? Crap, messed up again. Chris, it is the same as on the NZ forums for years if that helps? If not, PM email and I'll drop you one. Edit: Just checked link. Click on highlighted image of xls file and download should start. Link to comment Share on other sites More sharing options...
Lukas_K Posted October 2, 2013 Report Share Posted October 2, 2013 Question - I´m discovering the new approach and still getting my head round how the table works. Does it offer me any advantage compared to dedicated density altitude tables run off JBM? I like getting results from simplicity... This is what my current table looks like for a dedicated competition (known distances): https://docs.google.com/file/d/0B1ce3-R_CRarVEQyVDRuZG9ESW8/edit?usp=sharing Link to comment Share on other sites More sharing options...
brown dog Posted October 2, 2013 Report Share Posted October 2, 2013 Question - I´m discovering the new approach and still getting my head round how the table works. Does it offer me any advantage compared to dedicated density altitude tables run off JBM? I like getting results from simplicity... This is what my current table looks like for a dedicated competition (known distances): https://docs.google.com/file/d/0B1ce3-R_CRarVEQyVDRuZG9ESW8/edit?usp=sharing Lukas, your chart doesn't look like a density altitude chart - you have a fixed temperature. Have I misunderstood what I'm looking at? Link to comment Share on other sites More sharing options...
Ronin Posted October 2, 2013 Report Share Posted October 2, 2013 Realy simplistic diagram works for me, love lots as a training format.... Link to comment Share on other sites More sharing options...
Lukas_K Posted October 2, 2013 Report Share Posted October 2, 2013 brown dog: you calculate density altitude on the grounds of temp & pressure (both are accounted for already). If you use different temps in JBM, it is for Vo correction because of powder temperature sensitivity. I believe JBM can accomodate up to 5 temperatures at once for that, but the table then becomes really overcrowded... I see now, Thomas made a good illustrative video that I´ve missed before: http://www.youtube.com/watch?v=ZnZhF5c3iCM Then the method really is interesting and possibly worth creating the BDC calibrated turret first. Works the same as DA tables then, just a little more intuitive in the field. Link to comment Share on other sites More sharing options...
Missed Posted October 3, 2013 Report Share Posted October 3, 2013 Over the years I have used various methods both issued and non issued. Of them all I have found the Swedish method the most intuitive, especially when setting up a range card in a new position. However, like all systems both you and your No2 needs to fully understand how it works. I have now put together cards for all my calibes/ bullet weight/velocity combinations and keep them in an aide-memo dedicated to the cal. I have taken some flak on by some for being in the Stone age as others use the latest software, however when out in the field where batteries always fail when you least want them to, cards still work. Link to comment Share on other sites More sharing options...
brown dog Posted October 3, 2013 Report Share Posted October 3, 2013 brown dog: you calculate density altitude on the grounds of temp & pressure (both are accounted for already). If you use different temps in JBM, it is for Vo correction because of powder temperature sensitivity. I believe JBM can accomodate up to 5 temperatures at once for that, but the table then becomes really overcrowded... Got it. Thanks. Link to comment Share on other sites More sharing options...
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