Congrats on your hunting trip!
The 243 kills beyond its published ballistics profile for whatever reason. Have taken quite a number of peacefully feeding elk with it without mishap.
In my location of Kodiak Alaska that 243 cartridge though qualifies to take any meat animal I choose to shoot, however no one I know uses it because there are lots of big furry critters around that may choose to dine on us. NO margin of error!
That Striker in its current center grip configuration can safely shoot the 7WSM,300WSM,325WSM and I am shooting a 338WSM and still use the factory magazine. One need only swap the firing pin assembly, baffle and bolthead as I recall. As already stated, its quick and simple!
As a single shot and my current go to hunting gun at 6.7 pounds is your Striker with the bolt conversion in 338 Win Mag. I just drop a cartridge in on top of the follower and close the bolt. This particuler Striker is a third generation, meaning it has the single trigger transfer bar and the trigger has been polished and adjusted to a crisp clean 2 pounds.
The current picture here is of a factory 338 Win Mag rifle barrel that has been cut to 17", crowned and brake installed. I am allergic to pain so a quality brake is a must. As is pictured this Striker weighs 6.7 pounds.