can anyone fill in the blanks for me please?

[Guest]

Hi guys. I just want to make sure my data is correct. I have a .25 wildcat shooting .25.4 gr pellets at 905 fps . I believe the BC is .036 and I'm wondering about the velocity and BC for the jsb heavies 33.95gr. and also for the 26 gr predator polymags.
Jsb 25.4gr-905fps. BC-.036
Jsb 33.95gr-?fps. BC-?
Polymags 26gr-?fps. BC-?
Thanks

 

[Yrrah]

Same rifle same tune
Heavy 33.9 gr approx 815 to 820 fps (you get a bit more KE with the heavier pellet). BC 0.05 or al little less and is rifle and AP dependent.
Polymag, say 900 fps, BC say 0.03.
That will get you started. Hope it helps ...... kind regards, Harry.

 

[Guest]

Thanks Harry. Happy Thanksgiving