Has anyone reported a savage that will feed the 6br from mags? That is my first pick but it must feed from a mag.

I have been thinking alot about a .223 to shoot the heavy bullets. Would you guy stick with an 8 twist for the 70 to 80 grainers or would you go with a 1 in 7". Also how long would you go? I like shorter barrels but not at a huge expense of performance would 20in be enough or should I go 22 or 24?

Thanks for all the imput