Muzzle brake pull off , what is it and is it real ?

[ar15barrels]

Seems reasonable. And a 5.5lb rifle with a #1 contour barrel simply magnifies the effect, hence the dramatic POI shift. I bet another 3 lbs on the gun and/or a heavier barrel would change the offset dramatically.

Absolutely.

[Metal God]

How about this way of thinking , OK the brake if made well and the load is consistent "should" result in consistent groups . At what distance is this true , 100 - 200- 500 - 1000 yards . At first you want to say any , correct ? How ever at long range even the slightest movement of the muzzle will effect POI , correct ? So any shimmy the muzzle does before the bullet leaves can effect the POI at long range , yes ?

If there is leakage as some have suggested around the bullet . Are we saying that leakage is the same every time ? If not then the effects it has on the brake will be different each time , yes/no ? If it takes only the smallest of muzzle movement to throw off a long range shot , shouldn't the differences in leakage amount change the shimmy effect those gasses have on the brake ?

[ar15barrels]

How about this way of thinking , OK the brake if made well and the load is consistent "should" result in consistent groups . At what distance is this true , 100 - 200- 500 - 1000 yards . At first you want to say any , correct ? How ever at long range even the slightest movement of the muzzle will effect POI , correct ? So any shimmy the muzzle does before the bullet leaves can effect the POI at long range , yes ?

If there is leakage as some have suggested around the bullet . Are we saying that leakage is the same every time ? If not then the effects it has on the brake will be different each time , yes/no ? If it takes only the smallest of muzzle movement to throw off a long range shot , shouldn't the differences in leakage amount change the shimmy effect those gasses have on the brake ?

POA/POI shift effects ALL distances.
The POA/POI shift is built into the zero though.
Therefore, the effect is nominalized.

Leakage is not consistent.
If you examine a series of bullets that have been fired, you will see varying amounts of black on the outside of them.
The strongest black lines are where the gas was passing the bullet in the bore.
It's usually most prominent right at the corners of the land.
Leakage does not have enough effect to matter for the most part except with cast bullets where it contributes to bore leading.

[pacrat]

That makes sense.
140's take longer to get out of the barrel so there is more TIME where the rifle is recoiling before the bullet leaves the barrel.
The rifle is also recoiling more with the 140's so the barrel is pointed higher by the time the bullet leaves the barrel.

A very concisely articulated, factually stated observation.

The "bullet weight-velocity-barrel time" correlation is especially noticeable in handguns. Even with their much shorter barrels. Because of the grip angle and much reduced weight of the weapon. Muzzle rise during recoil is greatly accentuated.

[scotty99]

A very concisely articulated, factually stated observation.



The "bullet weight-velocity-barrel time" correlation is especially noticeable in handguns. Even with their much shorter barrels. Because of the grip angle and much reduced weight of the weapon. Muzzle rise during recoil is greatly accentuated.

[scotty99]

How about this way of thinking , OK the brake if made well and the load is consistent "should" result in consistent groups . At what distance is this true , 100 - 200- 500 - 1000 yards . At first you want to say any , correct ? How ever at long range even the slightest movement of the muzzle will effect POI , correct ? So any shimmy the muzzle does before the bullet leaves can effect the POI at long range , yes ?

If there is leakage as some have suggested around the bullet . Are we saying that leakage is the same every time ? If not then the effects it has on the brake will be different each time , yes/no ? If it takes only the smallest of muzzle movement to throw off a long range shot , shouldn't the differences in leakage amount change the shimmy effect those gasses have on the brake ?

[ar15barrels]

But barrel time is also greatly reduced. Your comment makes sense on the surface

Pick a random 2-5" barreled pistol from your handguns collection.
Lay a straight edge across the tops of the slghts.
Also slide a snug fitting cleaning rod into the bore so that it sticks out 12" or more.
Note the angular difference between the bore line and the sight line.
Report back with your observations.