muzzle brake

[double g]

how much oversize should the bore of the brake be than the bullet.

 

[blagg]

.020-.025 ish.

 

[jonbearman]

I USUALLY MAKE THEM .040 OVERSIZE.

 

[Preacher]

If you go much over .020 accuracy will suffer.... and the brake effect will be less..
It also helps if the hole is reamed after drilling...

 

[NateHaler]

how much oversize should the bore of the brake be than the bullet.

BLESS YOU for spelling brake correctly. Oddly enough, seems quite a few on this board would rather "break" their rifles.

 

[doc gordon]

les nod git 2 cared way wiy spelen!!

 

[toothman]

That's too phunny Doc!

 

[round]

If you go much over .020 accuracy will suffer.... and the brake effect will be less..
It also helps if the hole is reamed after drilling...

Reviving this.

I have some opinions on why accuracy would suffer if the bore is more than .020 larger , but I'd like to hear your thoughts on this. I'd like others to chime in as well.

 

[Sniperhandle]

Reviving this.

I have some opinions on why accuracy would suffer if the bore is more than .020 larger , but I'd like to hear your thoughts on this. I'd like others to chime in as well.

That was the old way of thinking, Now guys buy 338 suppressors and use them on 6.5 Manbun's in 2025

 

[round]

Some say the bore should be .02 over while others say .04 over.

can anyone provide some insight to this ?

 

[Sniperhandle]

Some say the bore should be .02 over while others say .04 over.

can anyone provide some insight to this ?

If you have dialed in the barrel perfect before threading, 0.020 is plenty. Although going bigger won't hurt anything, There are lots of suppressors with much larger holes than bullet diameters being fired.

0.040 would give you a margin for buildup though.

 

[ELR LVR]

Reviving this.

I have some opinions on why accuracy would suffer if the bore is more than .020 larger , but I'd like to hear your thoughts on this. I'd like others to chime in as well.

Laminar flow of the gasses
They follow the contour of the vessel
if anything is off, not concentric, or not aligned with the bore
they will favor one side and hit the base of the bullet throwing it off as the higher velocity of the gasses overtake the bullet upon exiting
sloppy thread tolerance doesnt exactly help here neither
---
the more room between bullet and bore hole
the more gas flow
---
proper seating depth is important also
---
However!
I have used things like a brake for a .308 on a 224 cal rifle
with no accuracy degradation
I think much of it depends on burn efficiency, caliber size, and most importantly
concenctricity of the brake to the bore
---
I like and use 3 slot brakes mostly, other brakes may affect this differently, such as a radial brake
I havent tested, I just know 3 slot brakes work well and I suffer no accuracy from them

 

[BHP9]

I have a Tikka T3x A1 Tac in 6.5 Creedmore and the brake that came with it is for a .338.

I purchased a Speerhead brake for the 6.5 and it's 0.020" over.

MDT has an excellent video explaining that 0.020" over is correct.

Just an aside I tested the rifle without the brake and with the brake (same batch of ammo and at the same time) the POI shifted slightly to the right but the groups were smaller.