widefat wrote:so, looking at the ballistics chart - do you add the scope height to the bullet path, or the bullet drop?
Ideally neither.
You run your dope chart based on a zero range > 0 yards. Therefore the scope height is already compensated for in the zero.
nearly all the long range shooters I know use a 100yd zero, and calculate their come-up from that. We use 100yds because its the easiest to find range close to home
Try using this ballistics calculator
http://www.hornady.com/ballistics-resou ... calculator.
click on the image and scroll down to see the whole chart.
- 223 rem.png (58.29 KiB) Viewed 3092 times
Ok, now we have a table with a 100 yd zero, for your .223 cartridge. ( i assumed a 55gr FMJ@3240fps)
Target is 400 yds, from the chart our come up is 1.9mils... we will assume your SFP scope has its reticle set so the MIL-dots are correct at max magnification.
Therefore hold over to the 2nd mil-dot, and send it. The got-ya on the SFP, is if you are NOT at the right power setting you've got to do some math to figure out what the spacing of the dots is at that power setting. Also the zoom on scopes is notoriously not-exactly what the power ring says it is.... so it really becomes a guess.
With a FFP scope, magnification is irrelevant, because the reticle is accurate at all powers, so I ignore my zoom setting, hold over 2 mills, and send it.
The other option on both scopes, is to dial 2 mils into your elevation turret, and then hold the center of the reticle on the target, and then shoot. And that would be my preference for a SFP... that way I'm not guessing about zoom/error.
