hysupra Posted September 28, 2014 Share Posted September 28, 2014 I have a 930 that I'm shooting open with right now and would like to reduce my recoil if possible. Is porting the barrel worth the money or is it going to slow my action down? If it does slow it down would lightening the bolt help that issue? Thanks guys. Rob Link to comment Share on other sites More sharing options...
openclassterror Posted September 28, 2014 Share Posted September 28, 2014 Porting the barrel should not slow the action a measurable amount. You may have to have the gas ports enlarged slightly as the pressure will drop sooner after the wad passes the ports. Simple ports without a compensator sleeve ( like the old JP type) will not have a huge effect on felt recoil. May be noticeable, but the Mossberg is heavy and gas operated already, so it will seem like it does less than the same port job on a Benelli. Make sure the port hole pattern is biased slightly above the barrel centerline, as the main benefit of ports is to reduce muzzle rise for controllability. A symmetrical port pattern usually results in half of the people who shoot it saying they can't tell the difference. A 60/40 pattern with more ports above centerline usually has about 80% of shooters reporting a seat-of-the-pants difference in felt recoil. Having a brake built around the porting makes a VERY noticeable difference in felt recoil. It reduces recoil enough to sometimes make inertia guns (like the Benelli) not cycle with light loads at all. Make sure the work is done by a 'smith who is experienced in shotgun work, not just the local gun-plumber. Link to comment Share on other sites More sharing options...
toothandnail Posted September 28, 2014 Share Posted September 28, 2014 Here's the test we did on our Mid Barrel brake for the MKA 1919 Shows a good reduction in recoil and muzzle rise, you can also see it in many of our 3-Gun videos https://www.youtube.com/watch?v=M0B_LvQwE40&list=PLi6rOytRmNmIYZFo2qwIdKFGz2NYnXhm2 https://www.youtube.com/watch?v=e__6eUz4jYQ https://www.youtube.com/watch?v=dd82u00kgvs Link to comment Share on other sites More sharing options...
openclassterror Posted September 29, 2014 Share Posted September 29, 2014 Yeah, like that . Much more quantifiable result than simple ports (drilled holes). Well done, appreciate the way opinion is removed from the equation. Seems like a lot of times the guys who report the most benefit from shotgun ports are the ones who thought it would work most before doing it. The tentative guys who aren't sure if it's worth the money are least likely to be happy with the work. With that vid, the bias of the operator is not a factor. Good input! Link to comment Share on other sites More sharing options...
toothandnail Posted September 29, 2014 Share Posted September 29, 2014 Thanks , kinda like the old "butt dyno" HP gains from our other racing days. We wanted a test that took opinion out of the equation, we thought that was a good example of how they worked. We tried 6 different versions before the final compairision, some did excellent on recoil, not so good on muzzle rise, and vice versa. Link to comment Share on other sites More sharing options...
Solidgun Posted September 30, 2014 Share Posted September 30, 2014 Doesn't porting the shotgun place you into open class? Link to comment Share on other sites More sharing options...
openclassterror Posted September 30, 2014 Share Posted September 30, 2014 Yes it does. OP stated he is already running in open with the 930, so it does not affect his division. Link to comment Share on other sites More sharing options...
Solidgun Posted September 30, 2014 Share Posted September 30, 2014 Didn't mean to hijack the thread, but I was curious as I thought I saw that in the rules and wanted to know if it was pretty much nationwide. Link to comment Share on other sites More sharing options...
openclassterror Posted September 30, 2014 Share Posted September 30, 2014 Yes, pretty much universal. Maybe a few outlaw matches that don't care, but 99% will say ports= open class. Link to comment Share on other sites More sharing options...
hysupra Posted October 1, 2014 Author Share Posted October 1, 2014 Thanks for the input guys, now I just need someone to make me a mid barrel comp for a vent rib barrel. Link to comment Share on other sites More sharing options...
LoganbillJ Posted October 1, 2014 Share Posted October 1, 2014 PM Sent! Link to comment Share on other sites More sharing options...
fastshooter03 Posted October 5, 2014 Share Posted October 5, 2014 The other way would be to lengthen the forcing cone on the chamber. you will lose a little velocity but it will take some felt recoil out. Nick Link to comment Share on other sites More sharing options...
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