ability to use both pump and side charging is pretty essential. Down on the ground and over barricade + support, side charging or traditional bolt action will work. Pump and lever only are ok for standing up actions only, but not for things down on the ground and behind barricades.
See why in WW1 and WW2 they stuck with bolt action.
Also - it is a .223. Really 11" is all that is needed. 12.5" is really for the legal thing.
And YEs, 300 black out will be nice with this.
The thing I do like about my Taipan is the fact that I opt for straight pull, I can just easily remove the pump foreend plastic pieces. If I take it to my club and put it on a rest/beanbag, that pump mechanism gets in the way. But for standing up or even if someone were to (hypothetically) use it for HD, the pump is essential. The fact that it can function as an either/or makes it a more compelling value proposition.
I would definitely take the 12.5" over 16" or worse.
The spring assist on the X (presumably on Evo and Scout) can be helpful but the absence of a foreend lock also it can be annoying with any slight movement the gun goes out of battery. It doesn't take long to get used how to hold the gun to reduce the chance of this happening, but it still happens.
Adjustable stock on the Evo Scout is definitely a gamechanger for those need shorter LOP (I already removed the two spacers out of my X to try to alleviate).
I am actually pretty happy an Australian company came up with this. With similar (albeit not identical) gun laws and restrictions there, I have always used Australia as the basis for (maybe bad presumption on my part) that if it is legal there, it should be ok here.
I certainly wish more Canadian companies came up with these types of things but given the political climate, I understand the reluctance. In the meantime, will be for sure looking for the Scout to come to Canada. I can forego the Evo for sure and wait