The screw in modules i showed you take the "back thrust" of ignition. Using the PR modules the action takes that thrust in a relatively small area. I would not be concerned about the plug holding up. I would be concerned about a SS module beating on the steel firing pin bushing which is in a alloy frame.
The screw in modules are Grade 9 and so far are working well in steel frame break actions and true bolt actions. IMO they should be safe if using BH209 in almost any action. Unfortunately the vendor wont sell just the screw in LRMP modules. They are around $125 for 10 with a breach plug.
Thank you though Ron. It turned out as i suspected. There was a very noticeable fps gain with direct ignition and BH209.