What would be my effective range?

[Coyotehunter2011]

Im getting ready to upgrade my 1377 by installing a steel breech, a stock, and a mil dot scope. With this setup what will be my limit on shooting starlings?

[1377x]

depends on a number of factors.lets start here
are you going to flat top it or leave it stock?
how many times are you going to be pumping?

[Coyotehunter2011]

Im going to leave the piston stock as of now, i might upgrade later though. I will either pump it 9 or 10 times.

[1377x]

heres a couple of things to help
http://www.airgunhome.com/pages/calculators.html
http://airgunexpo.com/calc/index.cfm?
you need to know pellet bc to use these calculators

lets say you are using a crosman premier
it weighs 7.9gr with a bc of .0230
lets say at 10 pumps it will get 550fps
there is alot of math input to do
but 40 yds seems to be right according to the numbers i used 50yds max

[Coyotehunter2011]

Did you have a link or something on that post because all i can see is,"heres a couple things to help".

[1377x]

Did you have a link or something on that post because all i can see is,"heres a couple things to help".

fixed that
keyboard is sensitive must have bumped something

[1377x]

here's another useful link
http://www.beemans.net/field%20use.htm
it says 3fpe on impact fo a starling
a 1377 shooting  a crosman premier lite 7.9gr @550fps-5.3fpe at the muzzle will impact target @422fps-3fpe at 50yds
i used the links i posted to get the numbers
this is assuming your 1377 is pushing 550fps at 10 pumps most do 

[Coyotehunter2011]

Ok thanks alot for the information.

[1377x]

no problem
heres some more info on pellets.there are others that cover skirt sizes pic etc
gn(grain),weights and bc
http://www.airgunforum.co.uk/forums/airgun-data-center/280-pellet-weights-bc-info.html