A ballistics question

[Bryan]

I was on Federals site and looked at a comparison of 711b, 922A and UA22 .22 long rifle ammo. The bullet weights are the same and muzzle velocities are the same( 1080) but the retained velocities are not; at 50 yards 994 / 961, 100 yards 930 / 880 150yards is 878 fps / 815fps. Can anyone explain that to me?
Here is the link to the Federal page.
http://www.federalpremium.com/products/print/compare/rimfire_compare.aspx?compare=49,844,843

 

[Cruisers460]

Bullet coefficient perhaps? Bullet shape can make a difference. I didn't see a shape or coefficient on that link.

 

[Bryan]

That is the only thing I could think of but as far as I can tell they are all 3 solid lead round nose 40 grain. I am baffled. I have posted this question on Rimfirecentral.com as well i will pass along anything I find out.

 

[Bear44]

It has to be ballistics coefficient. If all else is the same, aerodynamics are the only thing that can change sustained velocity.

 

[Bryan]

I emailed Federal. i am now in that "I gots ta know" mode.

 

[Springfield 1911]

It has to be ballistics coefficient. If all else is the same, aerodynamics are the only thing that can change sustained velocity.

I would also say ballistics coefficient.

 

[RamRoddoc]

I would also say ballistics coefficient.

Yes.

 

[Twitch2120]

they dont make the ammo so they wont know. contact RWS

 

[Bryan]

I was able t0 finally find listed BC for the federal 711b, 922 and UM22 on Brownells .
UM22 .093
922 .093
711B .138

 

[SemperWiFi]

BC without question...