 |  | | | |  | |  |  | .177 Cal Ballistics Coefficients ~ 13 FPE |  | |  |  | |
 Posted: Thu Jun 04, 2009 5:45 pm |
 |
|
| rsterne |
| Moderator |
 |
|
| Joined: 15 Jan 2008 |
| Posts: 2998 |
| Location: Coalmont, BC |
|
|
|
I finally got around to testing Ballistics Coefficients in my Diana 34 in .177 Cal.... Some of you will remember the non-PAL BC Charts I published about a year ago.... This time the velocities (with standard pellets) is in the ~850 fps range instead of ~495.... with muzzle energy ranging from 12 to 14 FPE.... Here are the results:
As with the .22 Cal chart, most of the BCs are NOT much different than the non-PAL ones.... Once again, many wadcutters are a bit worse, while many round-nose pellets are better.... In addition, the JSB Predator again seemed to perform better at the higher velocities as well.... Those pellets showing significant improvement over the non-PAL numbers have the BCs shown in bold.... 
The clear winners for Ballistics Coefficient are the JSB Exact series in all weights (7.9 gr. Express, 8.4 gr. Exact, and the 10.3 gr. Heavy).... the 10.2 gr. Weirauch Magnum / Beeman Kodiak (same as the H&N Barracuda).... the Crosman 7.9 gr. Premier and HollowPoints and the Crosman 10.6 gr. Heavy.... the 8.4 gr. Weirauch / Beeman FTS.... and the Beeman 7.9 gr. Trophy and 10.0 gr. Ram Jet (H&N Silouhette).... These were the ONLY pellets that maintained over 9 FPE at 25 yards.... 
I hope you find this information useful.... Ballistics Coefficients are a funny thing though.... you can't expect to be able to extrapolate the results (ie don't think a gun shooting ~700 fps will have the BCs half way in between, it may not).... If someone wants to send me a small quantity of any pellets missing, I will add them to the results.... 
In conclusion, pellet selection apprears even MORE important in higher powered guns, as those with poorer BC's seem to get worse while those with better Ballistics Coefficients seem to improve at higher velocities.... 
Bob |
|
_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal: Too many to count! |
|
|
|
|
|
| |  |  | | | |  |  |
| | | | | | | | | | | | | | |
| Posted: Thu Jun 04, 2009 6:24 pm |
|
|
| fritz |
| Silver Status Member |
 |
|
| Joined: 25 Nov 2008 |
| Posts: 2442 |
| Location: New Jersey- outside of Philadelphia |
|
|
|
Yet again, great work. And it's presented nice and neat.  |
|
_________________
"I never set out to be wierd, it was always everyone else who called me it" -Frank Zappa
Speed is impressive, accuracy is deadly.
It's not that I'm not a people person, it's just that I'm not a stupid people person. |
|
|
|
|
|
| | | | | | | | |
| | | | | | | | | | | | | | |
| Posted: Fri Jun 05, 2009 8:49 pm |
|
|
| TONBON |
| Veteran Member |
 |
|
| Joined: 02 Jan 2009 |
| Posts: 468 |
|
|
|
|
rsterne, yet again, you are the man.
very helpful info.  |
|
|
|
|
|
|
| | | | | | | | |
| | | | | | | | | | | | | | |
| Posted: Fri Jun 05, 2009 10:04 pm |
|
|
| sniper |
| Silver Status Member |
 |
|
| Joined: 28 Nov 2008 |
| Posts: 3752 |
| Location: Star, Idaho |
|
|
|
thank you bob!!!!! |
|
_________________
I believe in gun control,
If there's a gun around I
want to be controlling it....... |
|
|
|
|
|
| | | | | | | | |
Note: If you are seeing "Please enter your username and password to log in." Your browser cookies have been reset
or you need to register to access the topic in question. Use the 'Register' button near the top left of this page.
|
