As a general rule, cartridges up to 45-50grains of powder burned (not capacity) are best with a 3 port brake. 4 ports are good from 50 to about 65-70 and 5 ports are the most effective above 70 grains. This doesn't mean you can't run a 3 port on a magnum, but you will lose effectiveness, or it won't reduce as much recoil as a brake with more ports. As you go really small, .750" and smaller, the 4 ports work better on the calibers with powder charges in the 40-50gr range because the port sizes get small enough where they can't vent off enough gases with only 3.
Examples of 3 port calibers are: .308 win, 7-08, 6.5 Creedmoor, .243 win, 22-250, etc
Examples of 4 port calibers are: .25-06, .270 win, 30-06, 6.5 SAUM, 7 SAUM, 7 Rem mag
Examples of 5 port calibers are: 7 RUM, 300 win. mag, 300 RUM, 338 RUM, 338 Lapua, etc.
These are the thread sizes I recommend on barrel sizes in these ranges:
Below .540" is 7/16x28
Between .540 and .630 is 1/2x28 unless you want to turn it flush and then it's .670" and up
Between .630 and .700 is 9/16x24 unless you want to turn it flush and then it's .750 and up
Between .700 and .850 is 5/8x24 unless you want to turn it flush and then it's .800" and up
Over .850" is 3/4x24 unless you want to turn it flush and then it's .950" and up
These are coming soon.
The 3 ports will be 2.22" long and .670" OD with 1/2x28 threads. They weigh 1.9 oz
The 4 ports will be 2.67" long and .670" OD with 1/2x28 threads.
I will also do some Kimber versions with 7/16x28 threads
The 3 ports are 2.22" long, .750" OD, and are available in 1/2x28 and 9/16x24 thread sizes. They weigh 2.5 oz and are $72.00 shipped
The 4 ports are 2.67" long, .750" OD, and are available in 1/2x28 and 9/16x24 thread sizes. They weigh 3.0 oz and are $77.00 shipped
Very shortly I will have these available in 5/8x24. They will run about .150" longer than the list lengths for the other brakes and the
These are only available in 3 ports and were made for AR-10's and RPR rifles. They started out as .825" OD brakes and tapered to .750" but I'm in the process of changing that to .800" OD tapering to .750". The length was 2.22" but it will most likely increase a small amount when I run the newest version. I'm currently out of these and will run more soon when I do the Super Baby Beast brakes.
I will offer these in 3 and 4 ports and will be .800" OD.They will have the same port size as the Baby Beast 2 piece brake and be able to be turned to .750" in 1/2x28 and 9/16x24 thread sizes. The 5/8x24 version with have the same port size as the Lil Beast brakes. More details will be posted when they are completed.
These should be done in Feb.
The 3 ports are 2.22" long, .875" OD, and come in 1/2x28, 9/16x24, and 5/8x24. This is the brake I typically recommend for the Tikka CTR, Remington AAC/tactical/varmint, and many of the Savages in non magnum short action calibers. They weigh 3.0 oz and are $72.00 shipped
The 4 ports are 2.67" long, .875" OD, and come in 1/2x28, 9/16x24, and 5/8x24. They weigh 3.5 oz and are 77.00 shipped.
The 5 ports are 3.11" long, .875" OD, and come in 5/8x24, 9/16x24, and 1/2x28. They weigh 3.7 oz and are 82.00 shipped
All of these have about the same max tenon length of .760" to the first port and can be turned as small as .800".
The 3 ports 2.22" long, 1.01" OD, and come in 5/8x24, 11/16x24, and 3/4x24. They weigh 4.1 oz and they are $72.00 shipped.
The 4 ports are 2.67" long, 1.01" OD, and come in 5/8x24, 11/16x24, and 3/4x24. They weigh 5.1 oz and are $77.00 shipped.
The 5 ports are 3.11" long, 1.01" OD, and come in 5/8x24, 11/16x24, and 3/4x24. They weigh 5.6 oz and are 82.00 shipped.
I will add 1/2x28, M18x1, and M18x1.5
These are only available in 5 ports. They are 3.52" long, 1.235" OD, and come in 5/8x24 and 3/4x24. They weigh 9.5 oz and are $103.50 shipped.
I will add 7/8x20 to the available thread sizes on my next run. I have made some oversized ports versions for testing and will test them on a 375 Cheytac Imp as time permits.
These aren't designed to be turned down but can be tapered to your barrel diameter.
These are coming soon and will be basically the same as my Beast brake but with a finish diameter around .920" and are intended for Carbon Fiber barrels. I will make 4 and 5 ports for those looking for the ultimate in performance with the lightest possible weight.
I have a few of these done. The 5 port opened for .30 caliber weighs 2.3oz. The 4 port should be about 1.9oz as it weighs 2.1oz with a small exit hole. The 4 ports are 145.00 shipped and the 5 ports are 155.00 shipped.
I had some blanks so I made the smaller 4 port version first. The rest are still a few months out. These are 1.1" wide and about .873" tall. They weigh 5.1oz and the port height is almost the same as the 4 port Beast. It's actually .025" shorter but .112" wider. I expect to see performance similar to a 4 port Beast brake and I should be able to test them this week. These are 97.00 and are available in 5/8x24 threads.