I agonized over the same choice a few years ago and bought the 243, but mostly because a used Win 70 with a long heavy barrel showed up at the local gunshop. I did later buy a 25/06.
If I had to choose today, I'd flip a coin to decide. For groundhogs, a 55gr pill from a 243 at 4100 fps does ghastly work, and you can easily take a deer with a 95 or 100gr at about 3000 fps. The 25/06 runs 87-120gr bullets between about 3400 and 3000 fps so can work the hogs and deer equally as well - the latter a bit better. Both are about perfectly balanced for their bore size. Tough choice to make.
If I had to choose today, I'd flip a coin to decide. For groundhogs, a 55gr pill from a 243 at 4100 fps does ghastly work, and you can easily take a deer with a 95 or 100gr at about 3000 fps. The 25/06 runs 87-120gr bullets between about 3400 and 3000 fps so can work the hogs and deer equally as well - the latter a bit better. Both are about perfectly balanced for their bore size. Tough choice to make.
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