Pellet Ballistic Coefficients

This area is dedicated to the .177 caliber Benjamin Marauder by Crosman.

Pellet Ballistic Coefficients

Postby louigi600 » Wed Nov 21, 2012 11:58 am

I came across this: http://www.photosbykev.com/wordpress/userfiles/pelletdata.htm
I've no idea how reliable the information is but it could be a good starting point.

Just incase the link gets broken I'm gonna copy the info right here:
Calibre Pellet BC Weight
0.177 AA Field 0.021 8.4
0.177 Beeman Bearcub 0.011 8.0
0.177 Beeman Crow Magnum 0.013 8.8
0.177 Beeman FTS 0.014 8.9
0.177 Beeman H+N Match 0.012 8.0
0.177 Beeman H+N Match HS 0.007 7.5
0.177 Beeman Kodiak 0.023 10.5
0.177 Beeman Kodiak Match 0.024 10.5
0.177 Beeman Laser 0.010 6.5
0.177 Beeman Laser Sport 0.011 7.7
0.177 Beeman Perfect Rounds 0.014 7.7
0.177 Beeman Ram Jet 0.017 9.8
0.177 Beeman Silver Ace 0.010 8.0
0.177 Beeman Silver Arrow 0.018 11.5
0.177 Beeman Silver Bear 0.010 7.0
0.177 Beeman Silver Jet 0.013 8.4
0.177 Beeman Silver Sting 0.010 8.5
0.177 Beeman Trophy 0.019 7.9
0.177 Benj Sheridan Diablo 0.023 7.9
0.177 Bisley Long Range Gold 0.019 7.7
0.177 Bisley Magnum 0.025 10.5
0.177 Bisley Pest Control 0.012 8.8
0.177 Bisley Practice 0.010 7.2
0.177 Bisley Premier 0.016 11.4
0.177 Bisley Superfield 0.020 8.5
0.177 BSA Elite 0.018 8.0
0.177 BSA Excalibur 0.011 7.5
0.177 BSA Lazapell 0.019 9.0
0.177 BSA Storm 0.019 7.4
0.177 Crosman Accupell 0.021 7.9
0.177 " Cu head Pointed 0.028 7.9
0.177 " Cu head Wadcutter 0.010 7.9
0.177 " Powapell 0.019 7.9
0.177 " Premier Heavy 0.026 10.5
0.177 " Premier Lites 0.023 7.9
0.177 " Verminpell 0.010 7.9
0.177 DayState 4.51 0.018 8.4
0.177 Daystate FT 0.022 8.5
0.177 Dynamic PCP1 0.018 8.0
0.177 Dynamic PPP1 0.007 6.9
0.177 Dynamic SN1 0.015 8.0
0.177 Dynamic TM1 0.018 9.5
0.177 Eley Wasp 0.011 7.4
0.177 Exterminator 0.026 9.5
0.177 Exterminator FAC 0.034 15.0
0.177 Gamo Match 0.013 8.0
0.177 Gamo Pro-Magnum 0.012 8.0
0.177 Gamo Pro-Match 0.021 8.0
0.177 Gamo Rocket 0.013 8.0
0.177 Gamo Round 0.018 8.0
0.177 Gamo TS-10 0.018 7.5
0.177 H+N Baracuda 0.025 10.5
0.177 H+N Crow Magnum 0.013 8.8
0.177 H+N Crow Magnum 0.024 10.5
0.177 H+N Diabolo Sport 0.014 8.0
0.177 H+N FTT 0.022 8.5
0.177 H+N Hollow Point 0.010 7.0
0.177 H+N Silver Point 0.016 11.5
0.177 H+N Spitz 0.010 8.5
0.177 JSB Exact 0.021 8.4
0.177 JSB Exact Express 0.021 7.9
0.177 JSB Exact Heavy 0.031 10.3
0.177 Logun Penetrator 0.026 9.5
0.177 Marksman FTS 0.021 8.5
0.177 Round 0.018 8.0
0.177 RWS Club 0.010 7.0
0.177 RWS CO2 0.011 7.7
0.177 RWS Hobby 0.010 7.0
0.177 RWS Hollowpoint 0.010 7.4
0.177 RWS Meisterkugeln 0.010 8.3
0.177 RWS Meisterkugen Pistol 0.011 7.7
0.177 RWS R10 Heavy 0.010 8.3
0.177 RWS R10 Light 0.010 7.7
0.177 RWS Super Mag 0.012 9.5
0.177 RWS Superdome 0.013 8.3
0.177 RWS Superpoint 0.010 8.3
0.177 TechForce Dome (Chi)i 0.012 8.5
0.177 TechForce wadcut (Chi) 0.010 7.7
0.177 Webley Mosquito Express 0.021 7.9
0.2 Beeman Crow Magnum 0.017 12.5
0.2 Beeman FTS 0.020 11.0
0.2 Beeman H+N Match 0.016 11.9
0.2 Beeman Kodiak 0.025 13.3
0.2 Beeman Laser 0.010 9.0
0.2 Beeman Ram Jet 0.011 11.5
0.2 Beeman Silver Ace 0.013 11.4
0.2 Beeman Silver Arrow 0.016 15.4
0.2 Beeman Silver Bear 0.006 9.8
0.2 Beeman Silver Jet 0.015 11.3
0.2 Beeman Silver Sting 0.011 10.4
0.2 Benj Cylindrical 0.023 14.3
0.2 Benj Diablo 0.025 14.3
0.2 Bisley Magnum 0.027 13.3
0.2 Bisley Pest Control 0.012 12.4
0.2 Bisley Superfield 0.018 11.4
0.2 Crosman Premier 0.026 14.3
0.2 H+N FTT 0.025 11.5
0.2 JSB Exact 0.030 13.5
0.22 AA Field 0.031 15.9
0.22 AA Hunter 0.023 15.9
0.22 Accupell 0.027 16.0
0.22 Beeman Bearcub 0.023 16.0
0.22 Beeman Crow Magnum 0.022 18.1
0.22 Beeman FTS 0.016 14.5
0.22 Beeman H+N Match 0.011 13.5
0.22 Beeman Kodiak 0.036 21.1
0.22 Beeman Laser 0.009 13.4
0.22 Beeman Ram Jet 0.016 14.8
0.22 Beeman Silver Ace 0.014 15.0
0.22 Beeman Silver Arrow 0.012 17.1
0.22 Beeman Silver Bear 0.011 12.5
0.22 Beeman Silver Jet 0.012 15.5
0.22 Beeman Silver Sting 0.012 15.5
0.22 Beeman Trophy 0.015 14.0
0.22 Benj Sheridan Diablo 0.020 14.3
0.22 Bisley Long Range Gold 0.023 13.9
0.22 Bisley Magnum 0.035 21.0
0.22 Bisley Pest Control 0.023 18.1
0.22 Bisley Practice 0.012 13.5
0.22 Bisley Superfield 0.022 15.0
0.22 BSA Elite 0.019 13.8
0.22 BSA Excalibur 0.019 15.0
0.22 BSA Lazapell 0.015 16.0
0.22 Crosman Accupell 0.026 14.3
0.22 Crosman Pointed 0.024 14.3
0.22 Crosman Powapell 0.025 14.3
0.22 Crosman Premier 0.019 14.3
0.22 Crosman Verminpell 0.013 14.3
0.22 Dynamic PCP2 0.016 14.5
0.22 Dynamic SN2 0.014 12.9
0.22 Dynamic TAC2 0.012 14.5
0.22 Dynamic TM2 0.022 14.5
0.22 Dynamic XP2 0.012 14.5
0.22 Eley Magnum 0.032 30.0
0.22 Exterminator 16 0.026 16.1
0.22 Exterminator 18 0.028 18.0
0.22 Exterminator 20.5 0.032 20.5
0.22 Gamo Match 0.014 13.9
0.22 Gamo Pro-Magnum 0.012 16.0
0.22 Gamo TS-18 0.018 17.8
0.22 H+N FTT 0.029 14.8
0.22 JSB - AofAZ Pointed 0.016 16.0
0.22 JSB - Daystate FT 0.029 16.0
0.22 JSB Exact 0.031 15.9
0.22 RWS Eun Jin 0.035 27.8
0.22 RWS Hobby 0.012 11.8
0.22 RWS Meisterkugeln 0.010 13.9
0.22 RWS Super H Point 0.011 13.9
0.22 RWS Superdome 0.016 14.5
0.22 RWS Supermag 0.014 14.4
0.22 RWS Superpoint 0.011 14.3
0.22 Webley Lazapell 0.015 14.0
0.22 Webley Mosquito Express 0.028 14.3
0.25 Beeman Crow Magnum 0.011 26.1
0.25 Beeman H+N Match 0.012 21.6
0.25 Beeman Kodiak 0.037 30.6
0.25 Beeman Ram Jet 0.012 24.1
0.25 Bisley Pest Control 0.015 26.1
0.25 Bisley Superfield 0.028 24.3
0.25 Bisley Superfield 0 0.028 24.3
0.25 BSA Pylarm 0.020 18.3
0.25 Dai Sung 0.020 19.5
0.25 Gamo Hunter 0.014 20.3
0.25 H+N Baracuda 0.042 31.0
0.25 H+N FTT 0.024 20.0
0.25 H+N Ram Point 0.019 27.1
0.25 Logun Penetrator 0.030 25.0
Last edited by louigi600 on Thu Nov 22, 2012 3:40 am, edited 1 time in total.
Regards
David

Benjamin Marauder .177 cal.
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Re: Pellet Ballistic Coefficients

Postby Barnydaddy » Wed Nov 21, 2012 1:44 pm

Matches what I have.
Marauder Pistol
Crosman 1720T
TX200 MKIII, .177
Beeman R1 .177
Tempest .177
IZH 46M, .177
Blue Streak .20
Red Ryder w/Rifleman Mod
Bug-a-Salt
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Re: Pellet Ballistic Coefficients

Postby eelect » Wed Nov 21, 2012 8:42 pm

What coefficiency is better? .030 or .025.
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Re: Pellet Ballistic Coefficients

Postby pb177 » Wed Nov 21, 2012 11:16 pm

.03 will slip through the air better than a .025 pellet.

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Re: Pellet Ballistic Coefficients

Postby eelect » Tue Nov 27, 2012 4:37 pm

I need the BC for the Air Arms Field Heavy .177 Cal, 4.5mm, 10.334 Grains, Dome Pellets
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Re: Pellet Ballistic Coefficients

Postby louigi600 » Wed Nov 28, 2012 12:56 pm

I recall someone telling me that AirArms pellets are actually made by JSB .... You might like to try the equivalent JSB for a reference BC and see how that works.
Regards
David

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Re: Pellet Ballistic Coefficients

Postby lamerabbit » Thu Dec 20, 2012 9:34 am

Well that gives me a good laugh!

That being said, some of those values come directly from my old program, but most did not.

A large part of a pellets BC value comes from the barrel it is shot out of. Air gun barrels are choked sometimes on pour-pos sometimes crimped for sights and such, other times they are choked to death which usually leads to poor accuracy, and very odd BC values. Barrel leading will also reduce BC value. Those BC values for the 22 caliber Crosman Premiers, 14.3 grain round nosed are down right funny.... They must have been taken by someones imagination or through a rusty bent Chinese barrel.....

One of the guys from Speer told me he once took a bunch of new 308 bullets and rubbed them with fine steel wool and their resulting BC values when tested were completely different than those that had not been rubbed. One would think that such would not make much difference, but at super sonic velocities it don't take much to create more drag.

However with air gun pellets we are talking subsonic velocities, which is another problem in its self. The first problem is the actual pressure wave for the speed of sound actually starts building at or around 840 FPS, give or take. This is both good and bad for airgun pellets. One might think as so many use to that shooting at or below 840 FPS is best for accuracy, but they would be wrong! The first problem that you have when you fire any thing out of a rifled barrel is deformation; however that being ignored for a moment, brings to our first problem, which is stablizing the pellet's flight. While we all realize that our little and very frail airgun pellets are leaving the barrel at 500 miles per-hour plus; do you realize that we are also talking about our little pellets rotating at 32000 times a minute. That 32000 RPMs! and that even as they lose velocity they their RPMs don't slow down?

Now we are talking about hollow lead pellets, just imagine if one side of the pellet is just a tad bit thicker, and heaver on one side, or even just one tiny spot on the pellets length ???

Are any of you beginning to see the PROBLEM WITH YOUR ASSUMED VALUES??????


I spent hundreds of hours testing airgun pellets. shooting them across two chronographs with the first being at ten feet and the second at 47 yards! I did not just shoot a few rounds; I always shot strings of at least 25 shots, and before hand I always checked the Chrono's back to back to be sure they were reading the same.... Two things I learned very quickly, was when you switch batches of pellets, with most brands you almost need to start all over again. However with the best there were always differences but they were minor; second thing I learned when you switch guns it is the same as switching pellets....

Example I got BC values for the a-for-mentioned 22 caliber corsman round nosed premier from .027 to .032, and with the 177 caliber 10.5 grin round nosed premiers I got any where from .017 to .036, depending on batch and gun barrel shot out of. ....

To give you a small idea of how complicated rocket science can be, the BC values that were .017 average for 25 shots were also measured to be .040 at the 25 yard mark, all while crashing out to the .017 value at 50 yards…. The problem was not accuracy per say but one of stability in flight the further the pellet got from the muzzle the more it wobbled… It’s actually called Yaw, you would think the darn thing was an airplane, so go figure !

That said Merry Christmas to all!

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Re: Pellet Ballistic Coefficients

Postby eelect » Thu Dec 20, 2012 10:27 am

Makes perfect sense Jim because my 10g AA heavies and 13g Monsters don't match up worth a hoot using chairgun in my rifle!
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Re: Pellet Ballistic Coefficients

Postby louigi600 » Thu Dec 20, 2012 11:35 am

Never meant to give a bible ... just some starting poit for using EBC software.
I guess we would be all happier to use EBC based on reliable BC or DC functions rather then static coefficients.

I thinks this might make sense if you do holdover and dope calculations based on mildot range estimation and empirical wind estimation. If you have a laser range finder you will haveto work BC that best matches your pellet, barrel, range and muzzle velocity :-D
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David

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Pellet Ballistic Coefficients

Postby ShawnHu » Thu Dec 20, 2012 11:32 pm

Although probably not the bible of BC for pellets, this list does provide insight for those comparing pellets to find a higher BC pellet for longer range applications.

I too noticed that BC depends on the speed at which the pellet is traveling, and can vary up or down from that stated in the list.

I noticed that oxidized pellets will drop an inch or two at 100 yards out.
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