Zebra, I have several 0.22 rifles including the BSA R10 MK2, Brocock Compatto, AA S500, AirForce Condor SS, and Marauder pistol. I'm set with 0.22's.
Reason for the 0.25 is for bigger game. I have a Marauder rifle in 0.25 and Walther Maximathor in 0.25, but both are long, heavy, and easier to shoot from a bench rather than being lightweight brush guns.
As I stated earlier, I attempted the heating method but the grip area is very limited on the male-male shroud adapter which is epoxied to the base of the Huggett moderator. I didn't want to damage the moderator by using a strong vice which could bend the end-cap. And of course, once heated, very difficult to handle without burning myself in the process.