[Y]es, here we occasional-hunters are being limited to 1, 2 or 3 rifles(fire-arms) by LAW, lack of money/resources doesn't even come into play..iow, we have to carefully/properly motivate each & every F-arm/barrel application to the authorities EVERYTIME, & therefor,
alternatively, some(many) alternate loads needs to be developed for one & same rifle..& if there is a switch-barrel involved, BOTH/each, the barrels must be properly motivated & licensed..
It is not expected tht your local laws/regulations to be so draconian yet, though..
Any event.. Enjoy & keep us informed ?
app
This is one of the reasons that I thank God daily for being born in the USA, and for the opportunity to live in a state that respects the integrity and recognizes the rights of its citizens (46days until Kansans don't even have to have a permit to carry concealed handguns). Where I live, I don't have to have a reason to buy a gun, I don't have to apply to be allowed to buy one, and nobody knows if I have 1 or 300. I have the luxury of choosing where I live and work such that I won't have to tolerate states with disrespectful legislation, let alone a country that treats their citizens that way.
[H]ow will one go about, 1st'ly, re the actual switching of the barrels in these 3 rigs ?..will u do it yourself or not, or will g-smith help(before the trip ?) ?..therefor then,it probably won't/can't be a quick-switching job at the home/in the bush ?...ie, for myself I do foresee problems with adjusting headspace, etc, every time a barrel is switched, so, if I were in your shoes I'd carefully consider this aspect..& depending on yr own circumstances..
Fortunately I see tht the measurements of the back of the diff calibre-shells will not influence swopping the bolt..& these 3 rigs are nicely balanced, as well, again imho..
Pl do not get me wrong, u yo-self may not have prob's in these regards, but, myself being in your shoes will definitely be hard-pressed..
This isn't my first encounter with switch rigs, and I'll assume it will not be the last that I put together. It's not something that can be done in the bush with a swiss army knife, but it's not something that's so technically complex that the average shooter and "garage gunsmith" can't accomplish it themselves - afterall, it's quite literally about as straightforward as changing a lightbulb. The tools and gauges necessary to change barrels can be had for under $200, and the actual task can be finished in 20min if I'm really going after it.
As for how I'll set headspace: I've ordered the barrels short chambered, such that I'll do the finish reaming to set headspace myself. I own a set of 30-06 roughing and finish reamers, finish reamers for 300wm and 458 win mag (and Lott), and I'll be renting the rest to cut down on my investment.
As for how I'll switch the barrels back and forth: I will do so myself, which takes under an hour at a leisurely pace. For rigs that share a common cartridge family and OAL, just remove the stock, fix the action in a vise, crank off the first barrel, crank on the other one, check headspace, replace the stock, and rezero the optic. For more complicated cartridge swaps outside of the same cartridge family, you additionally have to replace the mag box (feed lips), follower assembly, and the bolt/bolthead. At a "slightly faster than leisurely pace," I can still switch between 223rem and 243win in my wife's Savage in under an hour.
As for how to sustain headspace: In my experience, once you set the threads by torquing and retorquing a few times, as long as you install the barrels to the same torque specification each time, they will retain headspace. I also include witness marks for alignment on the bottom of the barrel and receiver (and recoil lug in the case of sandwich style lugs). I buy the headspace go and no-go gauges for all of my switch rigs, but as Ridge Runner mentioned, that's really just extra expense - a cartridge case or even loaded cartridge of proper headspace can be used. In lieu of a no-go gauge, I've added shims to the base (or even just tape) of my go-gauge to act as a no-go gauge. These days, I just buy the gauges.
I can understand that most folks consider that level of "gunsmithing" to be over their heads, but the reality is that it's just a matter of screwing a male threaded barrel into a female threaded receiver - just like a lightbulb.