Looks like a "home-brew" more than a "commercial" conversion
LE bolt, and probably body?
The butt looks like someone's woodwork project, rather than the new, Monte Carlo style on my Oz-built "factory conversion", which, however, has a neatly "re-crafted" ex-mil coachwood fore-end.
Oz-built ones tend to have slow (1:14") twist barrels, all LH twist. This would suggest that they were made on the machines originally supplied to make .303 SMLE barrels. Thus, they are limited to short bullets. The "magic" one for mine is the old "Super" brand, 87gn, .257" soft-point. A dumpy looking "spitzer" if ever there was one, but they have the perfect combination of short length and thin jacket to work in those barrels at safe and realistic velocities. the 90gn HPBT Sierras are only 3gn heavier, but a LOT longer and will not stabilize at all. Speer make an 87gn bullet of similar shape and size to the old Supers, but it appears to have a somewhat tougher jacket and was probably intended for .25-06, .257 Roberts, etc.
Several versions of the .25/303 were also popular in Canada. Epps did some, including an "Improved" model that would be MUCH more at home on a P-14 action. Simplex here in Oz make (or made?) 7/8 x 14 die sets that work with MOST Oz versions of the cartridge. Case-forming is easy in the standard FLS die but, they MAY NEED to be trimmed. Chambers are known to vary slightly in neck and throat (leade) length.