Shoot a 300 or 400 or 500 yard drop with a 100 yard zero. Then change the velocity in the Input to match the drop. The drop does not lie. I always use a 500 yard drop w ith 100 yard zero.I did a drop table for my 6.5 creedmoor and then went out and shot it at 300 yards. According to my velocity, correct BC, and other pertinent info it says my drop at 300 yards should be 12.9 inches. It is actually 10.5 inches. Does my 20 MOA rail factor in or what else could be the problem? Thanks in advance.
Au contriere, BC.....the propensity to retain velocity.............is pertinent all the way from the end of the barrel to impact. However, BC varies continuously with velocity. Most BCs are listed as a single value, typically selected from the drag curve by manufacturers at the highest value for Marketing bragging rights and consumer confusion and duping. Using a CDC (Custom Drag Curve) can provide much more accurate ballistic data. You shared....this was my expectations; this is what I observed.......two numbers. With no more info than provided, it's almost impossible to answer your question. Every answer, including mine, is a SWAG (Silly WildNo it’s off your zero. You rail just gives you more travel in the erector of the scope.
chances are you muzzle velocity is off if all else is correct. BC isn’t even worth looking at as it doesn’t come into play until around transonic.
You need to change the muzzle velocity until it matches your 2 and 300y drop.
Don’t try to be a wise ***. I was giving you the benefit of the doubt to understanding the conversation be talked about, transonic range for a given load to a given cartridge. I speak the slang of my people for people who commonly understand.Wait a minute, Berger says: "it’s better to true MV 10% under transonic"?
The only way to measure transonic muzzle velocity is with a transonic load. Perhaps with a cartridge for a suppressed gun. If you meant downrange flight times all the way out through transonic, that sounds like a good thing for Berger to setup & do.
I'll repeat again for everyone else; Do not LIE to your software.
For every input that you actually know, enter the truth.
For good bullet path prediction you need to know bullet BC, the air density standard that BC is based on, your local air density parameters, your muzzle velocity, and your sight parameters.
SS: that looks like a G7 BC. Did you enter it as a G1 in your ballistics calculator?Zero is right on. MV is 2725 fps with a 140 hornaday BTHP with a BC of .580. Really has me scratching my head.
Thanks for telling us. This has been another excellent discussion.Mystery has been solved, duh. I was only shooting from 285 yards instead of the 300 that I thought . Numbers are right on the button.