Any copper in the barrel?
With the rifle unloaded, shine a flashlight across the muzzle. If there is any brown/rust/copper color...then you have a coppered up barrel.
Either of those bullets will stabilize in that barrel.
Be careful though, shooting light/middle weight bullets in a 1:7 twist will allow you to find out how to blow bullets up. Some blow up just outside the end of the barrel, some make it 15 feet. Will just be a cloud of gray and no holes in the target.
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