- Thread starter Ranger188
- Start date
Can I ask why the .007 is a deal breaker?
Don't want a 6.5 cal one? So go with a .30 cal then. Every major muzzle brake manufacturer makes for .30 cal.
Pick any that fit your barrel thread up to 30 cal.
Any reasonable clearance only makes a little difference if it's .030" to .1" in recoil reduction.
Or...a 6mm if it fits the thread, just make sure ya have .030" clearance ... drill it out for bullet clearance...I use a lathe and boring bar. I repurpose muzzle brakes all the time, including re-threading to fit the muzzle. Simple...
Here is an example... bullet too large, so drill or bore out the brake for clearance, this one was also faced when mounted on the barrel ...so it's quite "Marry Popins" when finished. Or parallel and perpendicular, as the bullet passes through, possibly aiding in accuracy, as the bullet comes out of the barrel bore, everything is equal on all sides and the face is exactly perpendicular to the bullet on exit. Life is like a box of chocolates, sometimes ya get the yucky one...Don't sweat the small stuff ...fix it.
Any reasonable clearance only makes a little difference if it's .030" to .1" in recoil reduction.
Or...a 6mm if it fits the thread, just make sure ya have .030" clearance ... drill it out for bullet clearance...I use a lathe and boring bar. I repurpose muzzle brakes all the time, including re-threading to fit the muzzle. Simple...
Here is an example... bullet too large, so drill or bore out the brake for clearance, this one was also faced when mounted on the barrel ...so it's quite "Marry Popins" when finished. Or parallel and perpendicular, as the bullet passes through, possibly aiding in accuracy, as the bullet comes out of the barrel bore, everything is equal on all sides and the face is exactly perpendicular to the bullet on exit. Life is like a box of chocolates, sometimes ya get the yucky one...Don't sweat the small stuff ...fix it.
Attachments
Did you measure the dia ...exactly? Did you make the brake? Did you try a bunch of other diameters ? like at least 10 brakes in several calibers? Or even one?. Run hundreds of groups to find that .020 is optimal for accuracy? A bold statement with no practical experimentation to be valid in anyway. And if such data were presented, would it be true for the next rifle...Or is the weight change of the bore diameter increase enough to change the harmonics to affect accuracy, for a particular barrel dia and caliber?
I do not think it would have any effect on practical accuracy if any attachments are centered perfectly and faced perpendicular to the bore on exit ..if too close, dia as to be affected by fouling or slightly cocked to the side, that will likely affect accuracy...just decreasing the dia of the rifles muzzle when machining & threading for a brake was supposed to open the bore dia slightly to relieve internal rifling stress, causing a slight decrease in accuracy...according to those who experimented with such things in Precision Shooting, many years ago.
I have seen tests on recoil reduction related to brake bore over sizing and it made little difference in recoil. But no studies on brake bore diameter and accuracy.
When you can shoot 5 .025 groups in a row at 100 then you can test that theory until then its pointless.
The barrel lands and grooves are in actual contact with the bullet as it exits the barrel, that's why the crown is critical.
If you're shooting F-Class or Benchrest, then there could be a measurable and consistent difference to be found. For PRS, hunting or other shooting disciplines, .020" to .050' of bullet clearance won't make enough of a difference to print on a paper target at 100 yards or 200 yards.
Run the 6.5mm brake and worry about the things that matter.
If you're shooting F-Class or Benchrest, then there could be a measurable and consistent difference to be found. For PRS, hunting or other shooting disciplines, .020" to .050' of bullet clearance won't make enough of a difference to print on a paper target at 100 yards or 200 yards.
Run the 6.5mm brake and worry about the things that matter.
Yep the 6.5 brake...its made for the 25 cals too...Look at the bullet dia .257" and .264" bullet dia. A Difference of .007" dia! Or an extra .0035" clearance around the circumference of the bullet. Big Whoop!
Or machine your own, like I do, if I really feel the need....
Next subject, this one has been solved.
Or machine your own, like I do, if I really feel the need....
Next subject, this one has been solved.
