It is my understanding that the ported barrels/chokes were to reduce felt recoil, muzzle jump and slow down the wad so it will not blow your pattern. This is accomplished by boring the ports so that escaping gasses are thrusting in the opposite directions of what it would normally happen. The forward thrust of the shot has already gotten all of it's momentum before any of the porting actions take place.
So to answer your question; No it should not effect range.
There will be an engineer along shortly to explain.
Porting reduces muzzle jump a little. I do not think it has much or any effect on velocity. It does make a lot of noise, and it does not reduce recoil much, so I don't think it is a good thing for a hunting gun. I know I would prefer to hunt with someone that does not have a ported gun.
I've had my 12ga. O/U pro-ported by Mag-na-port. Worth the money, yes. I use my O/U for both hunting & sporting clays. My hunting reloads are a little hotter (1255fps) than a field load (1220fps). The ported barrels makes my O/U recoil like shooting a auto. Before I had them ported I wouldn't shoot the hunting reloads, to much abuse on the shoulder. I've been thinking about having my 390 barrel ported & backbored. As for is it any louder, no. Porting does not increase noice level. The ports are angled back from the end of the barrel which will send some report back to the shooter/stand-bys. This is what makes it sound louder. Check out Mag-Na-Port website, all the info is there. Keith
My doubts are clear now (have a lot of answers and opinions), will work from there. My concern was velocity. If ported barrels are loud, sure, it's like a rifle with and Accubrake. Always use hearing protectors and case solve.
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