To my knowledge no semi autos use a true match chamber, they would not feed in a semi auto. The Bentz chamber is an improvement on the loose sporter chamber and is common, but nothing like how tight a Calfree 4 or similar match chamber.
Kidd chamber?? Proprietary
Proof research 22 chamber?? Proprietary
IBI 10/22 chamber?? Bentz or Proprietary not sure?
The IBI barrel I bought for a previous RimX had the calfee chamber.
I mean, I don't know #### about #### about precision 22 shooting, but isn't one of the major downfalls of the 10/22 platform the barrel wedge dealie? Wouldn't starting with something like a Grey Birch Fusion system go a ways to set you up for success if your goal was repeatable accuracy?
I thought this early on as well, so I sold a dlask tuff22 reciever I had paired with a dlask carbon barrel to purchase the fusion system. Well, lets just say, I sold the fusion system as soon as I could. Yes I tried multiple types of ammo, and still could not get things the same as the tuff system I sold to get it.
I ended up going full tilt into a RimX build, chasing this, and yes I did use the best ammo, and set the IBI carbon barrel and receiver for the ammo, and still I was disappointed. Not saying it was not accurate, but I guess I had higher hopes for it than I could get out of it. I probably set too high a hope for the RimX before I even started shooting it, and just could not continue. I ended up selling it all, and changed my pursuits a bit.
You want to chase accuracy on a 10/22, well start with a decent barrel, (which is a combo of the chamber and barrel), then a decent trigger, then stock, followed closely with the bolt and receiver combination. You have to get all these items to just pair up nicely and work closely together, even before you can throw the variable of the guy behind them all pulling the trigger.
Once you have that all figured out, then you can start the process of ammunition. Repeatable 10 shot groups is what your end goal is, and that is a lifetime pursuit with thousands of rounds being shot each year.