Ok. Alt strategy:
Goal is instant usability to 400m with minimum cost.
You won't have time or ammo supply to do trajectory verification. So use a light flat shooting bullet eg 140gr. 160+ will no doubt be better in the long run but needs careful testing and practice so you can't do it for this trip.
Start with a known readily available ammo perhaps the blue box mentioned. Preferably see if it's available on the shelf at 2 retailers in chch right now. Buy one box and take it to the range. If you can shoot 1.5 to 2 " at 100m that's good enough. Go back and buy 2 more boxes. If over 2" repeat and try another brand.
Next go back with your 50 rounds and sight in real good at 200m. Then put manufacturers BCand MV into a calculator and get predicted trajectory for 25 100 300 and 400m. Dont start a shoot up from >300m (200 m if you haven't got a rangefinder). Stick the trajectory onto your rifle butt and you're good to go.
Once you've used up most of your first 60 and got meat in the freezer you can start trialing higher performance or custom hand loaded ammo.
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