Given my experience with Savages, they "should" be long enough. I know that Sierra's 80gr works fine. Berger reccomends your twist for the listed bullets.
For the bases: That depends upon your scope, but if you have decent adjustment on your scope, then no.
If you launch an 80gr SMK bullet @ 2550fps, zeroed @ 1K; then you only need a max of 45.6moa. For an example, my VX-II has 79-ish moa. So from center that gives me almost 40 moa up/down. On my 308, just the way it worked, I had to adjust down for a zero. So to reach 1,000 with 175SMK's I have plenty extra adjustment.
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