View Full Version : porting?

November 28, 2001, 12:16 AM
I have a trap Browning Citori O/U with fixed chokes. (full on top and improved modified on the bottom) which is my dedicated trap gun. Question: Does porting really have a measurable effect on muzzle jump and / or recoil?
I hear that the heaver the load the better the effect, so: I load to 3 Dram eq, green dot and 1 1/8 oz. Of #8 shot.

Dave McC
November 28, 2001, 06:54 AM
Measurable,yes, "Feelable", probably not. We did a thread on porting recently, a search of the Archives should bring it up.

A shortened version....

For barnburner loads like the 3 1/2" Goose Howitzer ones, 1 7/8 oz turkey stuff, or the big slugs like that Brenneke 1 5/8 oz Mastodon Stomper, porting makes a difference one can feel, by most reports.

For any of the clay games, porting adds to the noise and blast factor, and the occasional piece of detritus flies out and makes life difficult for someone nearby. Some styles of porting are a stone cold %^&* to keep clean.

If you're recoil sensitive,fighting a flinch, or set on not getting one, AND HAVE DONE THE BASIC STUFF TO REDUCE THE KICK,then porting may have some advantages. Haveing the forcing cone done will do about the same for cutting kick, and aid the pattern. Backboring does too, but I've grave reservations about taking bbl metal away.

The basic stuff includes, good fit, good form, a load weighing less than 1/96 of the gun weight (the old Rule of 96), reducing load velocity and mass, etc.

FYI, my trap load is an oz of 8 1/2s at 1150 FPS.
I frequently run 25 straight, average is maybe 24/25. There's no big red S on my chest either.

I tried 7/8 oz, and hit most of them, but noted more chips and less explosions.

The Technoid, over on Shotgun Report, says one loses about an inch of usable pattern diameter when going from a 1 1/8 oz load to a 1 oz. The Archives there have lots of info on this.

In your shoes, I'd use that Browning(NIiice gun) with 1 oz loads, make sure it fits, and work on my form before kicking out shekels for expensive mods and addons.

HTH, and see you on the range...

November 28, 2001, 08:17 AM
One benefit of porting a clays shotgun.......flu and cold inhibitor. Works like BO and garlic amulets for keepin strangers away.


November 28, 2001, 10:52 AM
The two ported guns I've owned both came that way from the factory. In comparisons with guns of similar weight, I couldn't tell the difference the porting alone made. It's not something I would ever have done to a gun.

To reduce recoil, gun fit and a good thick recoil pad are the best things you can do followed by lengthened forcing cones and backboring although your Citori is probably already backbored depending on when it was made. You might also consider a padded shooting vest.

Muzzle rise doesn't matter much in trap unless you are shooting doubles. I usually go with a very light load 7/8s ounce of #8 for the first target and then 1-1/8 of 7.5 for the second shot with both loads around 1200fps.

For 16 yard however, I want the full payload for both the size of pattern and the density at longer ranges.