Parts of it are exact. We are operating in a very non perfect changing world.

Im still waiting to know what chart to copy and tape to my stock.....
5.5" difference at 400 is enough to miss the vitals and thats just at 10 mph. Of course, I wont shoot near that far, but this is a learning experience and right now what Ive learned is all charts cant be trusted.
If a sniper was to head shoot a bad guy he better pick the right chart or he misses and maybe hits the good guy. Im still curious if "normal" environmental differences can account for that much difference(5.5" at 400).

Which two charts are you looking at? Chad did mention earlier in this post that he had input the wrong ballistic coefficient. That would cause the skewed results.

Chads updated one and the one Bobo posted.
They appear to have exact same input info except possibly slight difference in environmental.

I been tied up with work. Give me a little time and I will set down and take my time and send you one to 100-400. You want a 2” high zero at 100 correct?

I come up with 13.6" of wind drift at 400 yards with a 10mph wind. Pretty close to Chad's numbers. All up and down the chart, my numbers are really close to Chad's. I looked at Bobo's numbers, and I can't figure out where the variable is that is making his calculations different.

Correct. Thanks Bobo.

Thanks to all. Im out the door to the lease for 3 weeks so I’m not gonna worry too much more about this thread but feel free to keep it going.
I’ll just leave y’all with my last target.
The bottom 3 with lower bullseye was for fouling after cleaning.
The upper 5 pretty much show the approximate 1/2” wind drift that most thought.
Of course, with my poor shooting, not being positive where it shot without wind, and the small sample size, that group means about nothing to prove wind drift but good to know the charts confirm it.

Free, DOPE is an acronym for “data on previous engagements”. In layman’s terms that means real time notes taken at the range are assimilated for reliable data. That trumps any “programs” that may or may not be exact with your setup. There is no substitute for range time for the shooters that can get down to it.

Smokey, always appreciate your comments.
I DO understand what dope means but I do appreciate you making sure and spelling it out for others as well.
I have shot this same rifle(exclusively) for 50 years and this same reload recipe for 30 years, but I don’t shoot a lot.
I have shot enough to know “pretty close” what this setup will do out to 300.
What I have not done, and reason for this thread, is shoot for research(dope) in the wind.
I rarely shoot much over 200 so I know enough about wind at that distance to get by.
What got the thread a little deeper into the charts than intended was there was a big difference in some of the info.
Alls good.

This is a dope thread.

Dope: slang for cool
Dope: slag for idiot
dope: acronym for data on previous engagement
dope: gotta be smoking some to get the different numbers in this thread

I've been at the range all day. I ran 2 different programs, and came up with .8" at 100 yards for 10 mph full value wind drift with the data you posted. If the wind was at your 4 to 6 o'clock, it will be less than this, depending on the wind angle. My answer is find multiple ballistic programs and run the data through them and see what numbers you get. I've run it 3 times now and have the same data.

Thanks Chad, and others.

3 weeks…. Man I wouldn’t know what to do with three weeks to hunt

Good luck

Shooter has the 165 partition at 0.3670 in my library, not .410 like mfg

I would have nothing to offer on that but would be curious to know more. I’m a sponge for info.

Some manufacturers have a habit of embellishing a bit on ballistic coefficient numbers.

This is the kind of stuff I need to know about.

And velocity, too. My Hornady 7prc precision hunter ammo was listed at 3k fps on the box, but only did 2800 on the Chrono from a 24" barrel.

I'm actually really disappointed in that one.

Nosler is bad about that.

Sierra is not telling lies, but they are still using a G-1 drag function. Everyone else will give you G-1 and G-7. Use the G-7 when possible.

Hornady and Berger tell the truth on their BC's.

Ouch I’m 2842 w/20” but hand load 175eldx

Velocity lies are the norm more than the exception.

https://texashuntingforum.com/forum...-believe-the-velocity-labeled-on-the-box