I want to say that I love my Pure Gold .670 choke. And it shoots very well out of my 870 and Hevi-13 3" 2oz #7's. But I get better 10" numbers with the Rem Ventilator .655 choke with that same load.
I'll show you some patterns.
Pure Gold .670 40yds tape measured 252 shot in 8.5"x11" paper
![](http://www.hunt101.com/data/526/DSCF0239_Medium_.jpg)
I think this was the 10" pattern underneath that target above.
![](http://www.hunt101.com/data/526/DSCF0215_Medium_.jpg)
Now let me show you some Ventilator .655 patterns.
Now in my honest opinion of shooting these same Hevi-13 3" 2oz #7 loads, I don't think you can hit this much better. This is a 11"x11" target.
![](http://www.hunt101.com/data/526/DSCF0076_Medium_.jpg)
Now this was the backside of the cardboard backer that the turkley target above was taped to. There is 282 shot in the 10" cutout.
![](http://www.hunt101.com/data/526/medium/DSCF0087_Large_.jpg)
Now here's another good pattern with the Ventilator and Hevi-13 #6's 1 and 3/4oz load. And that was shot on a cool 45 degree day.