Originally Posted by
dirt1008
Very nice Ron. So you have leupold set the scope for a certain muzzle velocity of your choice or the scope is made for that velocity and you try to adhere to it?
Leupold made them dial as per my order, but...................
After reading about the cds dial, i ran my favorite load through a chronograph a few different days, and using different rifle. When a muzzle velocity was established in my mind, i ordered dials from Leupold. For the X7, a dial engraved for a 1885 fps muzzle velocity was ordered. For Longer barreled rifles, dial for 1910 fps, and 1925 fps muzzle velocity were ordered.
It
amazed me that i could sight in the rifles at 100, and 200 yard, then set target, or water jugs out beyond that, and readily hit where i aimed. The dial for whatever rifle, would land bullets into the target virtually first time every time. It was kinda surprising that Leupold could use the muzzle velocity i sent, along with the bullet information, which was ballistic coefficient, and bullet weight and name, to engrave the dial so it was amazingly accurate for the actual long range shooting i did.
What i used for a load in every case was 300g Deep Curl bullet, and 110 of BH209. Last week, i was using a dial engraved for a mv of 1925. When i shot at jug placed at 300 yard, the bullet seemed to hit low. I figured that the bullet wasn't starting as fast as i measured last summer, so i added more powder so to increase the muzzle velocity. It seemed to work, because today the bullet flight seemed to match the dial i ordered. However, Ken suggested the bullets may have fallen short because of the air being more dense.
What ever the reason, i intentionally ordered dials made for 110g of powder. The reason i did this was so if the bullets fell short, i could add powder, and hopefully get them to fly, in the winter, the same they flew in the summer. It seemed to work today, but it seems to me, much much more shooting is required, before a conclusion is reached. Did you catch that? More shooting is required! Aw shucks.