Hydrashocker
Have you ever seen a true Ultimate ML. They offer a brake and seem to shoot fine with sabots. IIRC its a threaded brake. I dont use one myself.

ihookem
Hankins can convert a Encore for you. All you need to supply is the frame and 45/70 barrel. He uses a LRMP module and a breach plug of his own design. You can also get a LRMP breach plug from Precision Rifle or just use a Savage breach plug made for 209s. Slufoot on Dougs board can do the conversion with the Savage plug and maybe the PR plug too for under $150.

Personally, i would use a LRMP if i was building another SML.