Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Leica crf 1600 here! (short review)
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="jonoMT" data-source="post: 517700" data-attributes="member: 9463"><p>Just to clear up a couple of misconceptions...</p><p></p><p></p><ol> <li data-xf-list-type="ol">Re: using pressure and altitude in a ballistics app. If you have uncorrected station pressure then you always keep altitude at zero. If the pressure has been corrected (to what it would be at sea level - typically what you get in a forecast) then you have to enter the altitude so the app can undo the correction. In other words, it needs to know what the real pressure was at that altitude.</li> <li data-xf-list-type="ol">You can't expect good results if you multiply the range by the cosine. That's what's known as the Rifleman's Rule. Use the Improved Rifleman's Rule, which multiplies the drop by the cosine, e.g. if you have a drop of 17.1 MOA @ 600 yards and are on a 40 deg. slope, multiply 17.1 * .77 (COS 40) = 13 MOA. It won't be as good as a ballistics calc, but will be much closer.</li> </ol><p>As for the Leica CRF 1600, I can't say I'm ready to give up my Swaro for one. The ballistics features are half-baked. I could see a use for temperature, pressure and incline readings, but temperature doesn't play a huge role in ballistics calculations. How hard is it anyway to estimate it within 10-20 degrees? Pressure varies but not by a large amount. Also, I always carry a GPS and can get it from that. Incline? Yes, it can be hard to judge but I can either eyeball it within reason (having done surveying it might be easier for me) or if I'm carrying my handheld, let it calculate the angle for me by simply aiming it at the target.</p></blockquote><p></p>
[QUOTE="jonoMT, post: 517700, member: 9463"] Just to clear up a couple of misconceptions... [LIST=1] [*]Re: using pressure and altitude in a ballistics app. If you have uncorrected station pressure then you always keep altitude at zero. If the pressure has been corrected (to what it would be at sea level - typically what you get in a forecast) then you have to enter the altitude so the app can undo the correction. In other words, it needs to know what the real pressure was at that altitude. [*]You can't expect good results if you multiply the range by the cosine. That's what's known as the Rifleman's Rule. Use the Improved Rifleman's Rule, which multiplies the drop by the cosine, e.g. if you have a drop of 17.1 MOA @ 600 yards and are on a 40 deg. slope, multiply 17.1 * .77 (COS 40) = 13 MOA. It won't be as good as a ballistics calc, but will be much closer. [/LIST] As for the Leica CRF 1600, I can't say I'm ready to give up my Swaro for one. The ballistics features are half-baked. I could see a use for temperature, pressure and incline readings, but temperature doesn't play a huge role in ballistics calculations. How hard is it anyway to estimate it within 10-20 degrees? Pressure varies but not by a large amount. Also, I always carry a GPS and can get it from that. Incline? Yes, it can be hard to judge but I can either eyeball it within reason (having done surveying it might be easier for me) or if I'm carrying my handheld, let it calculate the angle for me by simply aiming it at the target. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Leica crf 1600 here! (short review)
Top