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Look into a Ken Farrell base. The bases are great, I have one in 20moa and 0moa and are built perfect. I had a EGW on my savage and it did the job as well. Prophet River sells the Farrell bases.
for most guns aluminum will be plenty, if your shooting a heavy big scope on a high recoiling rifle then I would switch to steel. EGW is Evolution Gun Works, they make aluminum bases.