When I initially had a switch-barrel built and put into a mini-chassis, I was shooting a bedded rifle and accuracy was a concern. Upon receiving the Manners stock and shooting the mini-chassis, I could not see any difference in accuracy, at least that I could shoot. I also have a rifle built by Jon Beanland in a Whiskey 3 that shoots just as well as either of the other two rifles so any thoughts I had about performance with bedded rifles vs chassis or mini-chassis have been dismissed. I would not hesitate recommending a mini-chassis and have ordered another Manners stock for an ELR switch-barrel build I've started and I am confident it will perform as expected.
Hope this helps...Semper Fi