You already have one of the best varmint calibers, there isn't much point trying to load many of the others up or down to try to achieve what you can already do with different weight bullets in the .243...unless you want a smaller case for less powder burn and recoil.
I would have another play with some different weight and makes of bullets and take the time to find out what that barrel likes before re-barrelling to something else.
Try a 95 grain Berger VLD hunting with 2209 for a great dual purpose LR varmint or deer load.
Mine hammers deer and turns rabbits and hares inside out using this combination and is a pleasure to shoot launching them at only 3040fps but utilising a great bc for the longer stuff.
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