More .177 Ballistics Coefficients
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More .177 Ballistics Coefficients
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Topic: More .177 Ballistics Coefficients (Read 6976 times))
rsterne
Member 2000+fps Club
Bob and Lloyd
GTA Senior Contributor
Posts: 26920
GTA Forums Person of the Year 2017
Real Name: Bob
More .177 Ballistics Coefficients
«
on:
August 23, 2013, 10:08:28 PM »
I measured a few more Ballistics Coefficients for "long range" pellets today (ie round nose & some hollow points).... The gun used was my Uber-Pumper at 20 pumps.... Here are the results....
These measurements were done with a more powerful gun than the previous ones, and there are some trends that are interesting....
The JSB Express at 918 fps had a lower BC than at 844 fps (0.025)....
The JSB Exact at 888 fps was essentially the same BC as at 791 fps....
The JSB Exact Heavy at 835 fps had a higher BC than at 737 fps (0.027)....
These results are consistent with what I observed with the JSB Exacts in .22 cal.... The BC peaks in the 800-900 fps range and then falls off, with the lighter pellets peaking earlier (at a lower velocity).... Of particular note is that the 7.8 gr. JSB Express was moving slower at 25 yards than the 8.4 gr. JSB Exact, despite it starting out with a 30 fps advantage.... The 10.3 gr. Heavy was only 20 fps slower at 20 yards than the 7.8 gr. Express....
There is a clear advantage in muzzle energy for pellets above 10 gr.... Thiis pumper acts just like a PCP in that regard.... At 25 yards, the pellets with the highest residual energy came from that group, and those with the highest BCs were the only ones with over 13 FPE remaining at 25 yards.... I should mention that the H&N Rabbit Magnum, while having a spectacular BC, shot like garbage in this gun, it took me 10 shots just to get three through the Chrony without getting error messages.... Too bad, because they sure hit hard at nearly 15 FPE....
For long range use in this gun there are really only two choices, the 10.3 gr. JSB Heavy and the 13.4 gr. JSB Monster, but the Heavy shot consistently tighter groups, so it gets the nod....
Bob
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Coalmont, BC, Canada
🇺🇦
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! 🇺🇦
Airsenal:
1750 CO2 Carbine, .177 Uber-Pumper, .22 Uber-Carbine, .25 Discovery, 2260 PCP 8-shot Carbine, 2260 HPA (37 FPE), 2560 HPA (52 FPE), XS-60c HPA in .30 cal (90 FPE), .22 cal QB79 HPA, Disco Doubles in .22, .25 & .30 cal, "Hayabusa" Custom PCP Project (Mk.I is .22 & .25 cal regulated; Mk.II is .224, .257, 7mm, .308 & .357; Mk.III is .410 shotgun and .458 cal), .257 "Monocoque" Benchrest PCP, .172/6mm Regulated PCP and .224/.257 Unregulated, Three regulated BRods in .25 cal (70 FPE), .30 cal (100 FPE) & .35 cal (145 FPE), .257 Condor (180 FPE).
Kailua
GTA Senior Contributor
Posts: 3613
Real Name: Paul
Re: More .177 Ballistics Coefficients
«
Reply #1 on:
August 23, 2013, 10:47:06 PM »
Thanks for all the hard work you put into giving us a lot of info. This time seems like it was a real physical work out.
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Kailua (Oahu) Hawaii
rsterne
Member 2000+fps Club
Bob and Lloyd
GTA Senior Contributor
Posts: 26920
GTA Forums Person of the Year 2017
Real Name: Bob
Re: More .177 Ballistics Coefficients
«
Reply #2 on:
August 23, 2013, 11:34:01 PM »
1200 pumps at each range.... Yep, my arms and shoulders are feeling it.... The Uber-Pumper has the tube and linkage from a 2200.... Past 15 pumps you can definitely feel it.... This gun will drive 7.8 gr. Express at 990 at 30 pumps.... I had it drive 7 gr. Hobbies supersonic with a 1400 pump and bigger valve on it.... just to say I did it.... *LOL*....
Bob
Logged
Coalmont, BC, Canada
🇺🇦
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! 🇺🇦
Airsenal:
1750 CO2 Carbine, .177 Uber-Pumper, .22 Uber-Carbine, .25 Discovery, 2260 PCP 8-shot Carbine, 2260 HPA (37 FPE), 2560 HPA (52 FPE), XS-60c HPA in .30 cal (90 FPE), .22 cal QB79 HPA, Disco Doubles in .22, .25 & .30 cal, "Hayabusa" Custom PCP Project (Mk.I is .22 & .25 cal regulated; Mk.II is .224, .257, 7mm, .308 & .357; Mk.III is .410 shotgun and .458 cal), .257 "Monocoque" Benchrest PCP, .172/6mm Regulated PCP and .224/.257 Unregulated, Three regulated BRods in .25 cal (70 FPE), .30 cal (100 FPE) & .35 cal (145 FPE), .257 Condor (180 FPE).
Bent
Marksman
Posts: 429
Real Name: Bent
Re: More .177 Ballistics Coefficients
«
Reply #3 on:
August 24, 2013, 04:25:37 AM »
Great test, (you don't need to/are able to) go to the gym for the next couple of days..
To bad those rabbits couldn't perform, that's a superior BC for a pellet....
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Denmark
Regards
Bent
-------------
Rohm Twinmaster Competitor .177 H&N Sport 8.1FPE
Hatsan 150TH .22 Mod.
Weihrauch HW100T .22 H&N Baracuda 31FPE
FX Bobcat regulated .25 JSB Kings 47FPE
palonej
GTA Senior Contributor
Posts: 6476
Another shooting discipline that drives me insane!
Real Name: Joe
Re: More .177 Ballistics Coefficients
«
Reply #4 on:
August 24, 2013, 01:31:10 PM »
Great info, as usual Bob!! Thanks bro!!
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MONMOUTH JCT NJ
CDT tuned Whisper Deluxe..SMOOTH
Shadow tuned Whisper Deluxe .177..SUPER SWEET
Scott (Motorhead) super duper tuned TX 200 Mk111 .177..ABSOLUTELY MAGNIFICENT & BRAIN DAMAGE ACCURATE
Motörhead transformed Vortek 56 TH .177..RETARDED ACCURATE 100 YARD GROUPER!!!
HW 98 Totally Motorheaded....SMOOTH BEYOND WORDS!!
HW 97 beech thumbhole SS Totally Motorheaderized....WOW!!!!
Motorheaded Walnut Pro Sport 177!!Put 10 pellets in one hole right out of the gate!!! KEEPER!!!
https://www.zeemaps.com/map?gro
rsterne
Member 2000+fps Club
Bob and Lloyd
GTA Senior Contributor
Posts: 26920
GTA Forums Person of the Year 2017
Real Name: Bob
Re: More .177 Ballistics Coefficients
«
Reply #5 on:
August 24, 2013, 02:11:05 PM »
I've never found a single gun that shoots the H&N Rabbit Magnums in either .177 or .22 cal.... Darned shame !!!
Bob
Logged
Coalmont, BC, Canada
🇺🇦
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! 🇺🇦
Airsenal:
1750 CO2 Carbine, .177 Uber-Pumper, .22 Uber-Carbine, .25 Discovery, 2260 PCP 8-shot Carbine, 2260 HPA (37 FPE), 2560 HPA (52 FPE), XS-60c HPA in .30 cal (90 FPE), .22 cal QB79 HPA, Disco Doubles in .22, .25 & .30 cal, "Hayabusa" Custom PCP Project (Mk.I is .22 & .25 cal regulated; Mk.II is .224, .257, 7mm, .308 & .357; Mk.III is .410 shotgun and .458 cal), .257 "Monocoque" Benchrest PCP, .172/6mm Regulated PCP and .224/.257 Unregulated, Three regulated BRods in .25 cal (70 FPE), .30 cal (100 FPE) & .35 cal (145 FPE), .257 Condor (180 FPE).
zenonine
Plinker
Posts: 273
Real Name: Randy
Re: More .177 Ballistics Coefficients
«
Reply #6 on:
August 26, 2013, 06:59:47 PM »
Thanks for your effort.
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Colorado
Hanabata808
Big Island Plinker
Marksman
Posts: 489
"I drank what?"
Real Name: Larry
Re: More .177 Ballistics Coefficients
«
Reply #7 on:
August 26, 2013, 07:42:45 PM »
Awesome stuff. Thanks for sharing!!
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Keaau, Hawaii
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All Springer/NP/PCP Air Gun Discussion General
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amb5500c
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More .177 Ballistics Coefficients