muzzlebrake help
- Thread starter Ferris
- Start date
0.020" over bullet diameter makes 0.40" total, .338" + 0.040" = .378". or at least that's how i read it. - dan
Or, if diameter of bullet is .338, and diameter of exit port is to be .020 greater, then .338 + .020 = .358.
Holland's brakes are good ones, their recommendation would make sense.
As mentionned, as the exit hole becomes larger, the efficiency of the brake is reduced.
Obviously the bullet cannot touch the brake, and installation should be coaxial.
Holland's brakes are good ones, their recommendation would make sense.
As mentionned, as the exit hole becomes larger, the efficiency of the brake is reduced.
Obviously the bullet cannot touch the brake, and installation should be coaxial.
shazam* I was merely responding to Ferris's specific question.
Example: The bullet diameter of a 338 Lapua Magnum is actually .338 diameter, the clearance of .020 equates to .338 + .020 + .020 = .378 exit hole.
The clearance is always specified over bullet diameter and it is added to the diameter of the bullet, this is how that number is arrived at.
I did not use the .020 off the top of my head it is a figure that some specify for their brakes like Holland which was mentioned above and for good reason. I learned through an article I once read that the ideal clearance that was arrived at after extensive testing was .020, more than this and the recoil reduction decreased accordingly, less than this and the accuracy decreased and errossion at the hole increased, so there is some sience behind this. The author of this article did extensive testing with various brake configurations and discovered that this was the ideal compromise.
Hope this helps.
bigbull
Example: The bullet diameter of a 338 Lapua Magnum is actually .338 diameter, the clearance of .020 equates to .338 + .020 + .020 = .378 exit hole.
The clearance is always specified over bullet diameter and it is added to the diameter of the bullet, this is how that number is arrived at.
I did not use the .020 off the top of my head it is a figure that some specify for their brakes like Holland which was mentioned above and for good reason. I learned through an article I once read that the ideal clearance that was arrived at after extensive testing was .020, more than this and the recoil reduction decreased accordingly, less than this and the accuracy decreased and errossion at the hole increased, so there is some sience behind this. The author of this article did extensive testing with various brake configurations and discovered that this was the ideal compromise.
Hope this helps.
bigbull
Guys, the specification by Holland is "drill 0.020 over bullet diameter." End quote.... Not 0.020" clearance.
Does anyone have any experience with accuracy and clearance? I suspect misalignment (bore center and barrel center) will cause problems and the less clearance would amplify the problem. My question is .....what down range accuracy issues would there be?
Bill any thoughts?
Does anyone have any experience with accuracy and clearance? I suspect misalignment (bore center and barrel center) will cause problems and the less clearance would amplify the problem. My question is .....what down range accuracy issues would there be?
Bill any thoughts?
Ah, thanks Joe, I didn't realise that. - dan
