does ballistic coeficeint matter

[JL]

Did a little test and found that the bc of most pellets doesn't really matter up
to 50 0r 60 yrds. I used a trajectory calculator and used the same criteria for
everything but changed the bc. The difference wasn't much greater than 1/8
of an inch from the highest bc to the lowest. So if your shooting is 60 yrds or
less you could use the caliber with a 0 as the first digit ie. .022 for .22 cal or
.025 for .25 cal and so on. It really didn't make that big of a difference. The
major effect is from the velocity.



tions,

[Bullit]

I Don't know what all entries you are using,  but I think that using a BC of 0.030 is not a realistic representative of the majority of pellet/gun combinations.   If you have a BC of over 0.020, you have a very good performing combination.  Your results will be different using a more realistic range of 0.014 - 0.022 for the various dome pellets.

[JL]

I Don't know what all entries you are using,  but I think that using a BC of 0.030 is not a realistic representative of the majority of pellet/gun combinations.   If you have a BC of over 0.020, you have a very good performing combination.  Your results will be different using a more realistic range of 0.014 - 0.022 for the various dome pellets.

I used the .30 for the .25 cal. I reran some computations and found if you just use
the caliber as you bc such as .022 for .22 cal or .025 for .25 cal it is still pretty close.

[Bullit]

Here is 1 table that shows the range of BC for various pellets.  You'll see that there is a wide range of BCs.  You'll see that theres a big difference in hollow points vs domes vs wadcutters.  Same with weights.    There will be bigger differences than 1/8" as you'll see if you plug in these numbers high to low extremes.  Chairgun Pro is the program to use.  Very accurate and graphic. 

http://www.photosbykev.com/wordpress/userfiles/pelletdata.htm

[Cal]

And that's why pellets make such useful back yard plinkers!

But if you want anything more.  BC is everything!  POI drop is such a small piece of the puzzle.

Put that Beeman Silver Bear at .006  up to some task past 10 meters ,    You will find out  which way is the wind blowing!  ;-)Whao!

[Bullit]

Exactly.  JL I do understand your thinking.  Using a single value based on caliber is simplifying a denominator.   If you want to simplify a little more accurately, you can take the pellet's average BC (based on TYPE) and have values for Hollow Points, Domes, Wadcutters, Pointed, etc.

[cactusrat]

Yes, the BC doesn’t change much, and may not matter for most people.

For some people it could mean the difference of winning a match or going home with your head hanging low.

Each gun and pellet (and environment  conditions) will have a slightly different BC. I took most of my guns and took reading at the muzzle and one at 30 yards with each pellet that shot good out of it and came up with the BC for each gun pellet combo.

This maybe a little much for most shooters, but I now have a better  BC of each gun/pellet combo and Chair Gun is a little more closer to the real world of my guns.

[JL]

Yes, the BC doesn’t change much, and may not matter for most people.

For some people it could mean the difference of winning a match or going home with your head hanging low.

Each gun and pellet (and environment  conditions) will have a slightly different BC. I took most of my guns and took reading at the muzzle and one at 30 yards with each pellet that shot good out of it and came up with the BC for each gun pellet combo.

This maybe a little much for most shooters, but I now have a better  BC of each gun/pellet combo and Chair Gun is a little more closer to the real world of my guns.

Yes, the BC doesn’t change much, and may not matter for most people.

For some people it could mean the difference of winning a match or going home with your head hanging low.

Each gun and pellet (and environment  conditions) will have a slightly different BC. I took most of my guns and took reading at the muzzle and one at 30 yards with each pellet that shot good out of it and came up with the BC for each gun pellet combo.

This maybe a little much for most shooters, but I now have a better  BC of each gun/pellet combo and Chair Gun is a little more closer to the real world of my guns.

I agree with your method but for most non competition shooters I think it
is accurate enough for most situations.

[JL]

Exactly.  JL I do understand your thinking.  Using a single value based on caliber is simplifying a denominator.   If you want to simplify a little more accurately, you can take the pellet's average BC (based on TYPE) and have values for Hollow Points, Domes, Wadcutters, Pointed, etc.

good advice but in my case which is pest control I have found it accurate
enough. Besides I usually use Baracudas or Predators so my calculations are easy.

[Bullit]

You might also look at Straightshooters.com and find your rifle there.   They do an "Our Take" on them and list a great spreadsheet on various pellets with FPS/FPE at 10,25,50 yds by using multiple Chronys.  They also show each pellet's BC.
Chairgun Pro has a great pellet selection to use in the program.

[JL]

You might also look at Straightshooters.com and find your rifle there.   They do an "Our Take" on them and list a great spreadsheet on various pellets with FPS/FPE at 10,25,50 yds by using multiple Chronys.  They also show each pellet's BC.
Chairgun Pro has a great pellet selection to use in the program.

I use the trajectory calculator on the American Airguns web site and found it
to be pretty thourgh with many varibles available.