I've done it in the past when I had my Ruger No.1's. With the old method of EDMing two ports, I never had any problem with the barrels splitting at the ports. Somebody has posted on this some time back. I ran into the guys who bought my No.1's a little while back and they're still in great shape. It reduces the muzzle jump on the Ruger 375 and 458 WinMag by about 1/4-1/3 depending on cartridge and load. This was absolutely needed back then as the rifles were way too light(about 8#). I believe that it costs close to $200 nowadays.

It doesn't reduce recoil so much as reduce muzzle flip, which can be considered a component of recoil.

George

I need to reduce the recoil of my .375 but I hate the look of muzzle-brakes. Have any of you guys "Magnaported" your big-bores. How much does it reduce recoil by?

I have a couple of rifles and one pistol done in Mag-Na-Port. As was said, it does not reduce recoil by any amount unless what you are perceiving as recoil is the stock busting you in the chops from the muzzle jumping up. This was the problem my son was having with his Marlin 1895SS .45-70. The porting almost totally eliminated muzzle jump, but straight back shoulder recoil is little if any affected. Also, contrary to what some have said in the past, porting does not reduce muzzle velocity. I had a load worked up with my .458 Winny. It was well established and well documented, chronoed many times, and I had ammo left over from the same lot before and after porting. There was no change in velocity, or felt recoil. However, you no longer needed to hold the rifle down on the rest while shooting. It just sits there now. Same for the 1895SS. The pistol, a FA .454, with the porting still jumps and bucks, but I have no before and after experiences with it as it came that way from FA, but I can tell you, it does not eliminate muzzle jump in a pistol, but I cannot comment on how much it reduces it as it still has plenty of jump left.
If straight recoil reduction is wanted, the first thing you can do is add a good recoil pad. I like the Pachmyer Decelerators. Next, you can add weight with a stock insert. Weight is not something I like to do as they are usually heavy enough as they are. The most effective way to reduce recoil is with a brake, like it or not. However, IMO the .375 H&H does not have that much recoil to begin with unless your rifle weighs 7 lbs or less. Before braking, you may want to just shoot it some more and see if you get use to it. If you reload, try reducing the loads to start and gradually work your way up to full power loads. If you want a brake that looks better than most, the KDF Streamline brake really blends in well with the barrel, and you can always remove it and put on a thread protector if you want. Due to a shoulder problem I had, I had KDF put a brake on my No. 1 .416 Rigby. The brake reduced the recoil on that one to below that of another No. 1 I have in .300 Weatherby. The load I was shooting in the Rigby was fierce, 325 gr. bullet at 2900 fps, but the brake tamed it down to a real pussycat and allowed me to keep shooting while the shoulder healed.

I Mag-Na-Ported my .416 Rigby. We compared the exact pair of rifles, sans the porting on Mike's gun and used the same loads. This was video taped also.

The reduction in muzzle jump on my rifle was dramatic compared to Mike's rifle when you look at the video. We shot these from the bench and 3 shooters took their turn. The results were the same.

The reduction in perceived recoil by 3 shooters who did not know which gun they were shootig first and second was commented on as "noticable".

Having several rifles that are ported, I can recommend it as benificial for what you want. However, I have had problems with copper build up at the 'ports' on a couple of rifles. It takes a lot or a while to get rid of the high spots.

I.M.H.O., there is a reduction in felt recoil and recovery time. It is not offensive in looks or noise. Be aware of the possibility of rough ports.

Good luck with your decision.

Sam

Hi check out theese muzzle brakes. www.muzzlebrake.com they are the same size as the barrel and work very well . and yes they are loud just like the rest i guess . Bob

I MAGNAPORTED a Rem Model 700 Classic in 350 Rem Mag years ago. It certainly helped that rifle. Before it was ported it had terrible muzzle jump. Now it's a joy to shoot.

Mac

It isn't any louder. I did a test with the equipment that was used to test suppressors and it was negligible.

I recently picked up a used magnaported Whitworth 375. I wouldn't have had it done, but the gun came that way. It is milder recoiling than my old Ruger #1 375, although that gun is manageable without. Less muzzle flip, and I think, less rearward push, though it's hard to tell. Shooting both off the bench, the Whitworth is surely milder using the same loads. I can't tell if it's substantially louder than the unported Ruger. Bob

It would even be more effective if you were to make an undercut around the magnaports to form a chamber to serve as a muzzle brake.

I had a CZ 375 H&H magnaported which my brother now owns. Honestly did not notice much difference. Will save myyself the money next time.
A decent muzzlebrake does make a difference but probably won't bother with one of these again either.

Karl.

I am a pretty small guy and I shot a buddies 378 Weatherby the other week. He has it ported and it really wasn't bad! I fired it from a standing rest and offhand and it was not any worse then my .416 Rem M70. I will try to post a pic of the porting tonight, there are a ton of holes in his barrel but it seems to be effective. The only thing I didn't like was the rifle twisted in recoil and keep hitting the interior of my trigger finger. I have always heard horror stories about the recoil of the 378, in fact the man whose rifle I shot knocked some kidney stones loose with one! After firing the ported one I am tempted to get one, it was actually pretty fun!
Jason