|
Joined: Oct 2015
Posts: 348
Campfire Member
|
OP
Campfire Member
Joined: Oct 2015
Posts: 348 |
The other day I swapped scopes on my browning xbolt. Sighting in, the first rounds were with a muzzle brake, the last few were without. All rounds were chronographed, and it was a beautiful sunny day. Rounds with the muzzle break were 69 fps faster on average than without. Odd?
Last edited by Bisley; 12/21/19.
|
|
|
|
Joined: Feb 2010
Posts: 17,927
Campfire Ranger
|
Campfire Ranger
Joined: Feb 2010
Posts: 17,927 |
|
|
|
|
Joined: Mar 2006
Posts: 14,520 Likes: 1
Campfire Outfitter
|
Campfire Outfitter
Joined: Mar 2006
Posts: 14,520 Likes: 1 |
Sounds to me like the outcome of random chance when dealing with a statistically insignificant sample size.
|
|
|
|
Joined: Oct 2015
Posts: 348
Campfire Member
|
OP
Campfire Member
Joined: Oct 2015
Posts: 348 |
That or something is up with my chronograph. 3180 fps with a 160 Accubond is trotting along a little hot in a 7mm rem mag.
|
|
|
|
Joined: Feb 2009
Posts: 4,531
Campfire Tracker
|
Campfire Tracker
Joined: Feb 2009
Posts: 4,531 |
Sounds to me like the outcome of random chance when dealing with a statistically insignificant sample size. This... What chronograph ?
|
|
|
|
Joined: Feb 2007
Posts: 7,438
Campfire Tracker
|
Campfire Tracker
Joined: Feb 2007
Posts: 7,438 |
I’ve seen that several times over the years with my braked rifles. Some rifles do it, some don’t.
You only live once, but...if you do it right, once is enough.
|
|
|
|
Joined: Feb 2004
Posts: 10,094 Likes: 1
Campfire Outfitter
|
Campfire Outfitter
Joined: Feb 2004
Posts: 10,094 Likes: 1 |
Something could be broken besides the muzzle.
|
|
|
|
Joined: Oct 2004
Posts: 26,574 Likes: 17
Campfire Ranger
|
Campfire Ranger
Joined: Oct 2004
Posts: 26,574 Likes: 17 |
Something could be broken besides the muzzle. Very well done!
|
|
|
|
Joined: Jan 2010
Posts: 956
Campfire Regular
|
Campfire Regular
Joined: Jan 2010
Posts: 956 |
^
Brake: a device for arresting or preventing the motion of a mechanism (like the reward travel of the rifle)
Break: to separate into parts with suddenness or violence. (like the gas leaving the muzzle)
They both work.
They both are derived from the same word.
|
|
|
|
Joined: Jan 2010
Posts: 32,130 Likes: 1
Campfire 'Bwana
|
Campfire 'Bwana
Joined: Jan 2010
Posts: 32,130 Likes: 1 |
Something could be broken besides the muzzle. Just based in the thread title alone.
If you put Taco Bell sauce in your ramen noodles it tastes just like poverty
|
|
|
|
Joined: Oct 2015
Posts: 348
Campfire Member
|
OP
Campfire Member
Joined: Oct 2015
Posts: 348 |
Something could be broken besides the muzzle. Very well done! Adorable, I used the wrong term of break instead of brake. Yall so punny. It's a Shooting Crony "gamma master".
|
|
|
|
Joined: Feb 2004
Posts: 10,094 Likes: 1
Campfire Outfitter
|
Campfire Outfitter
Joined: Feb 2004
Posts: 10,094 Likes: 1 |
Something could be broken besides the muzzle. Very well done! Adorable, I used the wrong term of break instead of brake. Yall so punny. It's a Shooting Crony "gamma master". Defiantly something broken besides the muzzle then. #chronographsmatter
|
|
|
|
Joined: Feb 2004
Posts: 10,094 Likes: 1
Campfire Outfitter
|
Campfire Outfitter
Joined: Feb 2004
Posts: 10,094 Likes: 1 |
Poking the bear aside, Shooting Chrony doesn't have a great reputation for consistency. Were lighting conditions different between shots?
|
|
|
|
Joined: Sep 2011
Posts: 14
New Member
|
New Member
Joined: Sep 2011
Posts: 14 |
Muzzle blast --- just saying !!
|
|
|
|
Joined: Oct 2015
Posts: 348
Campfire Member
|
OP
Campfire Member
Joined: Oct 2015
Posts: 348 |
Poking the bear aside, Shooting Chrony doesn't have a great reputation for consistency. Were lighting conditions different between shots? Thanks for the info. I don't know much about different chronographs, this unit is one my buddy bought and left at my house. Lighting conditions were generally the same, full early afternoon sun. I had the poles and sunscreens setup. I set the chronograph about 11 feet away and have the angle set so that my horizontal reticle crosses all four brass connectors on the sunscreen poles and the vertice is through the center and on the target. Maybe the unit is junk.
|
|
|
|
Joined: Mar 2006
Posts: 14,520 Likes: 1
Campfire Outfitter
|
Campfire Outfitter
Joined: Mar 2006
Posts: 14,520 Likes: 1 |
Try setting it 20 feet from your rifle. Muzzle blast from the brake can interfere with bullet velocity measurements.
|
|
|
|
Joined: Jun 2019
Posts: 2,518
Campfire Regular
|
Campfire Regular
Joined: Jun 2019
Posts: 2,518 |
Poking the bear aside, Shooting Chrony doesn't have a great reputation for consistency. Were lighting conditions different between shots? Thanks for the info. I don't know much about different chronographs, this unit is one my buddy bought and left at my house. Lighting conditions were generally the same, full early afternoon sun. I had the poles and sunscreens setup. I set the chronograph about 11 feet away and have the angle set so that my horizontal reticle crosses all four brass connectors on the sunscreen poles and the vertice is through the center and on the target. Maybe the unit is junk. [ this unit is one my buddy bought and left at my house.] - I like those kind of buddies! [Maybe the unit is junk] - It might or might not be "junk", but if it repeatedly and consistently shows you get higher velocity with the brake installed than without, it is still telling you an interesting fact. I suggest you repeat this effort any time you go to the range and find out.
|
|
|
|
Joined: Sep 2017
Posts: 2,795
Campfire Regular
|
Campfire Regular
Joined: Sep 2017
Posts: 2,795 |
Have you ever pulled a travel trailer with someone following closely? When the air is disturbed the vacuum is broken, velocity will increase.
|
|
|
|
Joined: Oct 2015
Posts: 212
Campfire Member
|
Campfire Member
Joined: Oct 2015
Posts: 212 |
Wouldn't the muzzle blast from the brake be headed away from the crono.....?
Have fun.....j3
|
|
|
|
Joined: Feb 2017
Posts: 397
Campfire Member
|
Campfire Member
Joined: Feb 2017
Posts: 397 |
Rounds with the muzzle break were 69 fps faster on average than without. Odd?
You'll often see similar changes in velocity with two different people shooting the same rifle/load. You can also see significant changes in velocity shooting the same rifle/load prone, benched or standing. The more the rifle moves rearward as the bullet moves down the barrel the slower the muzzle velocity will be. Brakes reduce the velocity of the rifle rearward so will often increase the bullet velocity at the muzzle. If you were to prevent the rifle from moving rearward by placing the butt against a rigid object, you would in theory see the maximum velocity possible because more energy is available to push the bullet down the barrel rather than being used to push the rifle rearward.
|
|
|
|
587 members (1Longbow, 1936M71, 1234, 007FJ, 160user, 1lessdog, 57 invisible),
2,408
guests, and
1,174
robots. |
Key:
Admin,
Global Mod,
Mod
|
|
Forums81
Topics1,192,528
Posts18,491,150
Members73,972
|
Most Online11,491 Jul 7th, 2023
|
|
|
|