With good ammo, those rifles will shoot OK. I doubt that removing the front part of the barrel would make much difference. Of course it depends on what you expect from the rifle. Quarter inch groups at 100yds? Get something else. "Minute of deer" - 3"-4" at same distance? Probably, if you do your part.
But Carcanos should have a bullet that runs .265"-.266", a tad more than the normal .264" for 6.5mm bullets. Not a big problem normally, but if accuracy is the name of the game, something to bear in mind.
Jim
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