The interlock ring is certainly there but it isn't very substantial at all.
I'd say your estimate is probably pretty close.
I was very disappointed when I found out that they were going with the interlock ring instead of the Interbond's bonding process.
I'm going to be very interested to see what changes have been made in the Interbonds that are currently in production. Hopefully we won't have a long wait.
They are actually running them now so surely it won't be long before they get them boxed and shipped to the stores.
I have never had an Interbond fail to perform and it looks like I may well be going right back to them as soon as they hit the shelves.
I've got some Perigrine Plainsmasters on the way right now and if I can get a load or two worked up with them they are going to get a workout soon. Our deer season opens this coming weekend and we really need to kill a bunch of does.