Pab1, your comment makes a lot of sense if you need to procure ammo. but keep in mind this thread is for a 'travel gun' (not necessarily a first choice survival piece).
Four points I took for granted when considering the standard English SMLE's; #1 in my rig I would make certain to have 200-300 rounds for that rifle (or a full load out for whatever weapon I chose), whatever could be carried reasonably without having to give up my water, my food, binoes, first aid supplies, bedroll, or whatever else was going in my ruck.
#2 Using a certain model for a truck gun doesn't mean one has to stick with that particular gun after getting safely home! My truck guns might be items I can afford to loose, easier than more quality and expensive pieces at home! I wouldn't want to have a $1200 AR (or larger and longer M1A) that got lost/stolen or confescated, if an SMLE or even a Mini-14 or SU-16 could be procured for much less. But even the Mini-14 and esp the SU-16 are pricey next to two or three SMLE's! Ishapore's are more expensive than a std SMLE, but having the .308 might be a huge advantage (and solution) for some users.
#3 And of course reloading might alleviate the ammo supply challenges too. If I had equipped myself with an Ishapore, I might have eliminated the [required] need for a handgun, altho having a wheelgun and levergun in the same round I agree opens all kinds of possibilities (and other solutions) as well.
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Digressing: I would hate to be stuck in the big bad, ugly cities if when all the scatology hit the ventillator during a SHTF crisis! But reading about such individuals who had that as their only choice might be VERY interesting too. (in what they'd do, but also how they decided to "cope" with living in the city. ***
*** I'm not from small town or rural America, but my dad was and I hunt and fish and reload regularly.
I still say there are some viable and really good gun choices still out there, that could be VERY serviceable in an emergency but could be made to look like second rate shooters (or junk) if NEED BE, my whole reason to mention the SMLE. I think the SMLE in particular oofers unique advantages.