A muzzle brake equipped magnum rifle (like a .300 or .338 Magnum) produces a sound pressure level (spl) in the 130-dB range, according to reports I have read. If the advantage of muzzle brakes is reduced recoil, the disadvantage is increased muzzle blast. $2500-3000,00. Later almost all of the shooter's hearing returns, but a certain amount is permanently lost, and the losses are cumulative. Mag-na-port claims an average recoil reduction of 15% with their porting system. Mag. Muzzle brakes reduce recoil by diverting part of these gasses to the side so that they do not add to the rearward recoil. Rifle in in very good condition and shoots accurate. rifle feels subjectively about like the recoil of a similar 7mm Magnum rifle without the BOSS device (or with a BOSS-CR). The .22 caliber model is available in 1/2″x28 TPI or non-threaded(must be pre-ordered) for non-standard custom threads, the .30 caliber and the 338 caliber models are both threaded for 5/8″x24 TPI. PodMods. Read More . These figures remain practical maximums for the modern hunter. I will buy another when I get my 338 win mag if it's not ported. Shop our vast selection and save! For example, Weatherby rifles in the ultra-powerful calibers .378, .416, and .460 Magnum are sold only with the Accubrake installed, which speaks volumes in itself. Hornady's 200 gr (13 g) SST Superformance load has muzzle energy of 4,076 ft⋅lbf (5,526 J) @ 3030fps. SAAMI and the CIP recommend a 6-groove barrel with a twist rate of one revolution, in a 10 in (250 mm) barrel with a bore Ø of .330 in (8.4 mm) and a groove diameter of Ø of .338 in (8.6 mm), with each groove having a width of .110 in (2.8 mm). (It rains a lot in Western Oregon.)  The .338 in (8.6 mm) is the caliber at which medium-bore cartridges are considered to begin. There is another type of muzzle brake. The best answer to the muzzle brake question is simply to avoid calibers that generate more recoil than you can comfortably tolerate. Weatherby, who claims that their Accubrake is the most effective on the market, claims recoil reduction of up to 53%. Original Sako rings $125.00. Summary: Overview of recoil results from all rifles, and overall ratings of each muzzle brake. In their literature, Weatherby compares the effectiveness of the Accubrake to several other makes of muzzle brake. Developed by Think Up Themes Ltd. Powered … Remington and Winchester offer four loadings each for the cartridge. The actual effectiveness depends to an extent on the cartridge for which the rifle is chambered. The cartridge follows the design of the standard length Weatherby Magnum cartridges such as the .257 Weatherby Magnum, .270 Weatherby Magnum and the 7 mm Weatherby Magnum for which Winchester had supplied basic brass until 1948. In European rifle makers Blaser, Mauser, Sako and Tikka also manufacture rifles for this cartridge. The second is the expanding powder gasses that are pushing the bullet and must also exit the barrel. The .338 Winchester Magnum is a .338 in (8.6 mm) caliber, belted, rimless, bottlenecked cartridge introduced in 1958 by Winchester Repeating Arms. It has also been found to be effective against the big cats where hunting allows for the use of the cartridge. Mag, the “softest” here, slaps the shooter as hard as a.375 H&H Magnum, while the.338-378 and.338 Lapua are close to.416 Rigby territory. This is about twice as much as the recoil from an average .308 Winchester. However, since that time preferred bullet weights have decreased to weights between 200–225 gr (13.0–14.6 g). The most common bullets loaded for the .338 Winchester range from 200 gr (13 g) to 250 gr (16 g). Try this. No problem ! (on parts and labor.) This rifle was fired from a bench rest at an outdoor rifle range with covered, but not enclosed, firing positions. It maintains 1,899 ft⋅lbf (2,575 J) @ 2068fps @ 500 meters.