Right now I am back to my old belief that most all of us are being fooled by chronographs. I dont think we can spend $100, $200 or even $500 on a piece of equipment, to measure the speed of a projectile 1 1/2" long and traveling at a speed of 3000 fps. and expect this equpment to be accurate. How can something that cost only a few hundred dollars do this? Yet we undoubtingly rely on them. And even more so, we believe that when they say 5 or 10 measured projctiles fell into with in less than 10 FPS of each other, we believe it and are happy. I am not sure I buy this. Right now I think Eaglets method of finding MV is far more accurate than any chrono I have been around in my 40 years of shooting. I also believe that your 1000 yards group is the best test for ES.
Thanks!
Jeff
I want to shoot across an oehler now. If it shows my velocity to be at the 2705 area I wll buy one. If not, I dont feel I need a chrono because I have always had to change the given velocity anyway to match the Balistic programs. Who knows, maybe they are all wrong...lightbulb
Jeff
Broz,
Remember my Shooting Chrony post?
I suggest a good set of chronographs set up to run in tandem, or the Oehler 35P with the proof channel.
I can say with high confidence that running quality dual chronographs in tandem (or the Oehler 35P with the second Proof channel) will accurately identify ES & SD. I've explained this in prior threads, so I won't rehash it here. The set of
quality chronographs (or 35P equivalent with its dual recording capability) is typically the more accurate method of obtaining MV also, rather than guesstimating MV based on drops - IMO. The only way one could ID MV with drops is if one absolutely has the correct BC entered into the ballistics software, has properly accounted for atmospheric conditions, operates the software correctly, and is a dead-eye of a shot (you pass that last one with flying colors).
I will acknowledge that
IF Bryan Litz's G7 BCs are
all dead on the money, you should be able to come close to your actual MV with extensive shooting like you're currently doing. And I give Litz's G7 BCs the benefit of the doubt for being correct, based on the limited testing I've done to date with 1000 yd chronographed velocities for three separate bullets. I do think Bryan has his act together and is producing quality BC data. So I think Eaglet was on the right track respecting the Berger BC and looking at MV (based on the Shooting Chrony if nothing else
) as a source of faulty input data. You enter valid input data into LB, and it will produce accurate predicted dope.
Keep an open mind. You may end up surprised what quality chronographs (you have to have two run in tandem to have any basis to trust the data - IMO) are able to do in the way of capturing accurate velocities. From repeated observations on this Forum, many invest $3000 to $6000 on their rifles & scopes and then go sour on chronographs based on their purchase, and experience with, an entry level model chronograph. And those conclusions are probably well deserved -
based on the use of a single, low end chronograph.
Even with a quality chronograph, the only way to establish and separate valid recorded data from the faulty recorded data (which will occur every now and then), is with the second chronograph run in tandem.