Wet Dog
05-08-2006, 05:58 AM
Ever wonder what effect barrel length has on velocity?
Hopefully others will find this data useful. I'm a new owner of a Chronograph so I'd be very interested to get feedback from those with more experience.
Conditions and specifics
Sunny, Breeze 7-18 mph, some higher gusts, quartering from rear. 65* F. Chrony Alpha master set up 12' in front of muzzle. Up to 15 shot strings. Listed fastest to slowest.
FEDRAL 550 Pack 37g copper HP
-Marlin 39A (39A) 24" barrel 1263 fps (averaged). Very good+ accuracy
-Marlin Golden 39A Mountie (Mountie) 20" barrel 1254 fps Very good+ accuracy
-Marlin 39TDS (TDS) 16" barrel: 1254 fps Very good Accuracy
CCI Mini Mag 40g solid, copper
-39A: 1255 fps, OK accuracy
-Mountie: 1225, Good accuracy
-TDS: 1221 fps, Fair accuracy
Aguila SE Subsonic 38g lead hollow point
-TDS: 1007 fps, Good+ accuracy
-Mountie: 994 fps, Very Good+ Accuracy
-39A: 984 fps, Very good accuracy
Notes: It was interesting to see that with this ammo the 16" barrel produced the highest velocity.
CCI CB Long 29g Lead Solid
39A: 677 fps, Fair- accuracy, VERY quiet
Mountie: 675 fps, OK accuracy
TDS: 668 fps, Good accuracy
CCI Blazer 40g Lead Solid (20-30 years old)
39A: 1230 fps, OK accuracy
Mountie: 1203 fps, Very good- accuracy
TDS: Did not test
Accuracy definitions; 25 yards for rifle, 25 feet for pistols.
Excellent= 5 shot group covered by a tack
Very Good= 5 shot group covered by dime
Good = 5 shot group covered by a nickle
OK = 5 shot group covered by Quarter
Fair= 5 shot group covered by a Fitty cent piece
Poor= anything bigger
Other Notes:
-The Chrony Alpha Master was easy to use. I had it set up within minutes the very first time.
-The Marlin Mountie is my least Ammo finnicky of my rimfires. It seems to shoot everything at least OK.
-The Marlin TDS is the most finnicky. Amazingly though it shoots the CB longs better than anything else I own. It must be a female.
-The TDS also produced the highest velosity of the subsonic ammo.
Hopefully others will find this data useful. I'm a new owner of a Chronograph so I'd be very interested to get feedback from those with more experience.
Conditions and specifics
Sunny, Breeze 7-18 mph, some higher gusts, quartering from rear. 65* F. Chrony Alpha master set up 12' in front of muzzle. Up to 15 shot strings. Listed fastest to slowest.
FEDRAL 550 Pack 37g copper HP
-Marlin 39A (39A) 24" barrel 1263 fps (averaged). Very good+ accuracy
-Marlin Golden 39A Mountie (Mountie) 20" barrel 1254 fps Very good+ accuracy
-Marlin 39TDS (TDS) 16" barrel: 1254 fps Very good Accuracy
CCI Mini Mag 40g solid, copper
-39A: 1255 fps, OK accuracy
-Mountie: 1225, Good accuracy
-TDS: 1221 fps, Fair accuracy
Aguila SE Subsonic 38g lead hollow point
-TDS: 1007 fps, Good+ accuracy
-Mountie: 994 fps, Very Good+ Accuracy
-39A: 984 fps, Very good accuracy
Notes: It was interesting to see that with this ammo the 16" barrel produced the highest velocity.
CCI CB Long 29g Lead Solid
39A: 677 fps, Fair- accuracy, VERY quiet
Mountie: 675 fps, OK accuracy
TDS: 668 fps, Good accuracy
CCI Blazer 40g Lead Solid (20-30 years old)
39A: 1230 fps, OK accuracy
Mountie: 1203 fps, Very good- accuracy
TDS: Did not test
Accuracy definitions; 25 yards for rifle, 25 feet for pistols.
Excellent= 5 shot group covered by a tack
Very Good= 5 shot group covered by dime
Good = 5 shot group covered by a nickle
OK = 5 shot group covered by Quarter
Fair= 5 shot group covered by a Fitty cent piece
Poor= anything bigger
Other Notes:
-The Chrony Alpha Master was easy to use. I had it set up within minutes the very first time.
-The Marlin Mountie is my least Ammo finnicky of my rimfires. It seems to shoot everything at least OK.
-The Marlin TDS is the most finnicky. Amazingly though it shoots the CB longs better than anything else I own. It must be a female.
-The TDS also produced the highest velosity of the subsonic ammo.