Bill with the Remington Long Range .300 Win Mag with Vortex 4-16x50 scope, fitted with the Grizzly 21.65 muzzle brake.
My son Macen recently bought a Remington Long Range .300 Win Mag he setup for long-range outings. Shooting the heavier 180-grain to 200-grain bullets, the rifle generates quite a bit of recoil and torque, even though it weighs in on the heavier side at about 5.5kg.
However, the main problem is that under full recoil the sight of the target was being lost through the scope dueto the muzzle jump (but Macen’s older brother Bill reckon she’s just a bit recoil sensitive). The answer to this problem, it seemed, was to fit some type of muzzle brake to tame this beast, so the rifle’s full accuracy potential could be realised as well as making it more enjoyable to shoot.
Untilnow,I had only ever owned and used one rifle with a muzzle brake fitted, a CZ550 Safari in .458 Lott. Having only fired that rifle with the muzzle brake on, I was rather reluctant to remove it to see just how heavy the recoil would be without it. So at this point I wasn’t in a position to say how well muzzle brakes worked, even though I have mates who have them fitted to their favourite shoulder cannons and swearby them.
And so it was Australian Shooter was given the chance to review the Australian-made Grizzly muzzle brakes and my interest was sparked. Shortly after talking to Michael from Eagleye Hunting Gear and to the designer/ manufacturer of the Grizzly, PaulStathis, two different muzzle brakes were forwarded for testing - a Grizzly TAC anda Grizzly 21.65.
The TAC is a flat/square brake similar to those seen on military rifles and the 21.65 is a traditional round one with several rows of holes. In preparation, my local gunsmith had threaded the barrel muzzle on the Remington with a 5/8x24 TPI thread. For the testing I acquired some Hornady 200-grain factory loads, some Remington180-grain Core-Lokts and 180-grain Remington Premier Accutips.
All three loads were tested through the .300, with the shooting shared between myself and my eldest son Bill, who’s a better shot than me. Shooting off the bipod on the shooting bench at 100m with no muzzle brake, we both gaineda feel for the recoil of the rifle with the various loads. Although not too unpleasant,(after shooting my lightweight Kimber Montana .338Win Mag which is brutal) the rifle did indeed torque during recoil and the muzzle did jump significantly, obliterating my imageof the target throughthe Vortex scope. However, all groups were still quite acceptable at around 1".
The first muzzle brake to be fitted was the Grizzly 21.65 which is 65mm long, round in cross-section with 12 lines of 4.5mm holes (42 holes in total),to jet the muzzle gases to counter the rifle’s recoil. The Grizzly’s engineer and manufacturer, Paul, had advised this brake would dampen the rifle’s felt recoil by approximately 60 per cent, a substantial claim to be sure.
Shooting the next few groupswas somewhat of a revelation, with the big .300 Win Mag’s recoil curbed significantly. Bill and I agreed the recoil now felt more like that of a lightweight .243 Winchester firing 100-grain loads and with virtually no muzzle jump.
The main problem had been sorted, as it was now quite easy to maintain the sight picture through the scope under full recoil. The heavier 200-grain loads were still shooting under an inch, but the big surprise of the session were three 8mm to 10mm groups that Bill shot with the cheaper Remington Core- Lokt 180-grain ammo.
We then changed muzzle brakes to the Grizzly TAC, the more military looking, square model of the two. Unlike the 21.65 which is just screwed on tightly, the TAC needs to be screwed on until it abuts the end of the thread, thenit needs to be turned back until the flats are level, where the two Allen head bolts are then tightened to keep the brake in place.
Once it was set, we repeated the shooting process and were again impressed with
its performance. Felt recoil was reduced significantly but not quite to the same level
as the 21.65 (only slightly more felt recoil than the aforementioned .243 scenario). However, it seemed to have slightly less muzzle jump than the 21.65. Again, all groupsshot were slightly better than the control groups we managed first without any muzzle brake.
At the end of the review I was hard pressed to pick a favourite between the 21.65 and the TAC as both performed extremely well as promised, in arresting recoil and muzzle jump, turning the hard-kicking Remington .300 Win Mag into a mild-mannered varminter. Both brakes add just 42mm to the length of the barrel and I believe that choice comes down to personal preference between the ‘Tacti- Cool’look of the TAC or the slim traditional lines of the 21.65.
The Grizzly muzzle brakes worked amazingly well and are precision engineered, quality Australian-designed and manufactured products, which come in both stainless and blued versions. For more information on Grizzly Muzzle Brakes and all Eagleye Hunting Gear products. Visit: https://www.safarifirearms.com.au/collections/grizzly