barnesuser28
Well-Known Member
Now Broz, based on you experience, if my chronograph is lying to me will its error be a certain percentage or always be off say 100 fps?
Ok Jeff, thanks i really appreciate it!Riley, I wish I had a solid answr for you on that, but it could be like this. I use to line 3 Shooting Chrony's on a 2x6 and shoot through 2 or 3 of them. They were all different on the same bullet. One was 40 to 60 fps faster no matter where you placed it (first or last) one was pretty consistant but slower and one would bounce around either side of the other two..... But hey here is what I can tell you for sure. If you use the suggested BC from the bullet mfg. And do actual field drops to 1000 yards. Then using those drops change the muzzle velocity to match the actual dial ups needed to center the groups you shot at a given distance. You will be pretty darn good to 1000 or 1200 yards. After that you may have to go in and play with BC's.
Jeff
Ok Jeff, thanks i really appreciate it!
Well then, he's got other issues to resolve.Bart I think I read in a previous post where Riley had already done this.
Well then, he's got other issues to resolve.
Adjusting for ballistics is a nightmare. Especially when the data you have doesn't end up making the end result what you want. Finding the one error in a long list of variables can be frustrating. Been there. Done that.
How'd you figure the velocity was about 60 fps off?Broz is exactly right on the money for doing your own field tests and then fudging with your velocity and BC. I took my 25-06 out and field tested the 115 gr bergers. My velocity was off by about 60 fps from what my chrono said.
Differences in atmospheric conditions between what Shooter used and what existed where you shot could easily have made that difference.My chrono was reading around 3050 to 3060 fps but when I put that velocity into Shooter it wasn't giving me the right amount of drop out to the ranges that I was shooting. I had to lower the velocity in shooter to I believe it was 3000 fps to match the drop in elevation that I was getting from the field testing.I can't prove that the chrono was wrong but when I changed the velocity in shooter it got me right on all the way out to 700 yds. Maybe Im working with shooter in the wrong way but who knows.