Using someone elses chrono data and changing altitude/temps

[atepointer]

So I'm trying to make a stab at what my MV 'might' be since I don't have access to one. I have a friend with same rifle, same ammo, but different temps/altitude when he had a chrono day. Sooooo using ShootersCalc I can certainly change atmospherics, but the muzzle velocity has to be known as best as I can figure out how to do this. Is there any way to make an entry into a ballistics calc to show what a temp/alti change would do to a MV?

He is 900 ft above sea level 60 degrees and I'm sea level 95 degrees. Out of his 24" barrel he is getting 2700 on the button.....so if he teleported to where I shoot would there even be any dif in velo? That may make this whole exercise pointless if so! Thanks....Mr. Stupid

 

[Wormydog1724]

His rifle's muzzle velocity is likely to be different than your rifle's muzzle velocity even if you're side-by-side or on a different continent.

His muzzle velocity likely won't be different than his own muzzle velocity just due to altitude change. Temperature, specifically ammo/powder temperature, could have an affect on the velocity if the powder is temp sensitive.

The only way of truly knowing your own muzzle velocity from your own rifle would be A: shoot over a chrono or B: shoot at distance and true your ballistics calc to your drops. You can guesstimate with his data but until you put rounds downrange, it's a guess.

 

[atepointer]

Ok thanks man appreciate it. Will probably just drop some coin on a chrono and get er done then.

 

[Wormydog1724]

Ok thanks man appreciate it. Will probably just drop some coin on a chrono and get er done then.

I’m using the el cheapo Caldwell. It gets shit on by everyone but it works fine 82% of the time, every time.
And my drops line up with my ballistic calc using the chrono'd velocity so confirmation at work.

 

[atepointer]

I’m using the el cheapo Caldwell. It gets shit on by everyone but it works fine 82% of the time, every time.
And my drops line up with my ballistic calc using the chrono'd velocity so confirmation at work.

That's good enough for me b/c Sex Panther only guarantees 60% of the time....every time. I'm in for Baldwell