It appears that you are seriously limited in your selection because of not reloading.
That 270 with 90gr bullets is a hogs nightmare.
Personally I can only say that reducing the muzzle weight can be accomplished by using either a light varmint tapered barrel or cutting a barrel back to 20".
223, 22-250,243,257 Roberts come to mind for factory offerings. Weight is in the eye of the person carrying it. I use to carry a 14 pound 6Br and a 12 pound 22-250 until I got tired of exhaustion after 8-10 hours and many miles of walking in rock chuck country in Idaho. Now I will carry a 10 pound 204 Ruger with 17" barrel or a 6Br with the same lenth barrel and same weight.
Neal
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