barrel porting

[greyowl]

How much change in recoil do you get from barrel porting?
I'm thinking of the Marlin guide type guns that had it. 45-70, 450,444. I realize it could vary a little between calibers, but in general. Is there a % or specific amount of foot lbs. that should be expected in these rifles with the factory porting?

[Kapincrunch]

I dont think they change recoil as much as they effect muzzle flip. The idea being that you should be able to get back on target faster. But, the ports are utterly deafening. I actually sold a 450 Marlin (fantastic little gun) simply because the stinking thing was so loud. Now, I put a really good recoil pad on the gun and that changed the recoil drastically.

[Pete44ru]

They definitely reduce muzzle flip, by as much as 25% IMHO.

Muzzle brakes never bothered me, like making my ears ring, etc - although they bother OTHER range users allright.
I always wear ear protection during range zeroing/practice/etc, but not while hunting - and have never consiously been aware of any shot on game, except for feeling the recoil force and hearing a "bang".
I suppose it's because I was focused on the animal/excited, at the time(s).

.

[gimdandy]

The change is significant . That being said it depends on HOW the porting is done , the exact results that you want , and intended purpose. On the guide and the outfitter , the way it is done is on top of the barrel on both side of the front sight which helps some of the recoil and helps a lot of the muzzle rise. If the porting is the entire circumference of the barrel the change of felt recoil is dramatic and less muzzle rise is a direct result .
Now be prepared for a change of muzzle blast. If the porting is the entire circumference of the barrel the blast deafening w/o ear protection, if it is just on top it is normal blast for the shooter or anyone standing directly behind , but to the side of barrel it is noticeably lots louder to others w/o ear protection .
I've used round holes , angled round holes , and angled trapezoidal slots from Magnaport w/ 100% consistent results on rifles and competition shotguns. No experience w/ a pistol barrel

[AJMD429]

They definitely reduce muzzle flip, by as much as 25% IMHO.

Muzzle brakes never bothered me, like making my ears ring, etc - although they bother OTHER range users allright.
I always wear ear protection during range zeroing/practice/etc, but not while hunting - and have never consiously been aware of any shot on game, except for feeling the recoil force and hearing a "bang".
I suppose it's because I was focused on the animal/excited, at the time(s).

.

Same here, only I also wear muffs when hunting (Howard Leight electonics - they amplify the deer footsteps on the ridge just out of sight, but clip gunshots down to the same level as regular muffs).

I don't have any two identical guns where one is ported, but I do have two ported guns. One is a Taurus Tracker .357, and it definitely helps reduce recoil, but I doubt affects noise much. The other is a ported Guide Gun; it sure doesn't seem to recoil much with 'normal' modern ammunition, but maybe the really hot stuff could make it painful. Thankfully, no Grizzlys around here, so if a 'normal' .45-70 won't stop what I'm shooting at in its tracks, I'm likely to just drop the gun and RUN...!

[TuPapito]

The ports on my 300 Weatherby turned it from Der Loudenboomer Ouchencauser to something as comfortable as a .243 Winchester. Reduced the recoil by around 50%.

[86er]

Bartlett's Viaso system is supposed to be 50% reduction guaranteed. There in Hondo, Texas.