30 cal Muzzle Brake on 6.5 - oversized?

zog

Sergeant of the Hide
Full Member
Minuteman
Aug 21, 2019
154
42
66
This might belong in the stupid questions forum, but . . . will it cause any problem to use a 30 cal radial muzzle brake on a 6.5 mm muzzle? Is it common to have a little extra clearance, or is it best to go tighter?

Thanks
 
You can always put a smaller object through a bigger hole. You’ll sacrifice individual percentages in recoil performance but I’m fine losing 3%.

I go 30 cal for every attachment and never have to worry about putting a smaller hole on a barrel for a bigger bullet because I only have up to 30 cal rifles. That’s where you get into trouble, smaller hole and bigger object.
 
You can always put a smaller object through a bigger hole. You’ll sacrifice individual percentages in recoil performance but I’m fine losing 3%.

I go 30 cal for every attachment and never have to worry about putting a smaller hole on a barrel for a bigger bullet because I only have up to 30 cal rifles. That’s where you get into trouble, smaller hole and bigger object.

Giggity..lol
 
I don't remember exactly which brake manufacturer it was but I read a while ago (within the past 6 months as I've been looking at 308 and 6.5cm barrels) that the company did some testing and found that you only gained around 5% more recoil reduction using a 6.5 brake on a 6.5 vs a 30 cal brake on a 6.5. Not enough for me to worry about getting a 6.5 brake and will just get 30 cal brakes unless i drop down to 6mm at some point.
 
  • Like
Reactions: yej0001
As mentioned no issue at all. I have a .338 can adapter brake on one of my 6.5s and .30 on the others. I have a .30 on my 6mm too. Cuts recoil just fine.
 
  • Like
Reactions: AustinP69
Doesn't really matter.

If you want a muzzle brake in which you can use on multiple different calibers while still maintaining the optimum bore size, look into the newest Insite Heathen. You can change out the inserts on the end to go from say a 6mm to a .30 cal.

Not a necessary feature by any means, but something to consider if looking at purchasing a new brake. Has other great features as well, it's my favorite self timing brake. If you already have a .30 cal brake, then just run with that.
 
You can always put a smaller object through a bigger hole. You’ll sacrifice individual percentages in recoil performance but I’m fine losing 3%.

I go 30 cal for every attachment and never have to worry about putting a smaller hole on a barrel for a bigger bullet because I only have up to 30 cal rifles. That’s where you get into trouble, smaller hole and bigger object.
This is my approach as well. I realize that I'm giving up a few percent in terms of muzzle brake efficacy, but I am okay with that given the headaches avoided.
 
Wow thanks for all the answers.

Yes it was obvious to me that the 6.5 bullet would slide through the 7.62 brake without needing any grease. I asked this question because I found a used .30 brake for a great price and wanted to get all your experiences before I bought it for my 6.5.

If I have learned anything about this precision shooting game, it's that micro-things matter a lot. I pictured maybe the extra annulus of larger brake might create some weird turbulence right at the exit, similar to if it wasn't crowned correctly. I have seen posts where shooters talk about different brakes causing different ballistics. One in particular said he couldn't get consistency with his 2 port brake, but his 3 port brake was perfect. How could that be?

The other thing I've learned it that you can't calculate everything - you get all the info you can but you just have to get out and shoot for your own dope. Now that I bought the brake it will be interesting to see what results I get.

Don't worry - I won't try to get my own dope on a 6mm brake just to see what happens! I'll wait til a crazy you-tuber tries it and watch the video.

Happy New Year!!
 
Last edited:
  • Like
Reactions: Guiseppe83