I have two Mauser actions that could be donors for a custom rifle. One is a sporterized military of which version I do not know. I am trying to identify it, but with so many versions it is confusing. The other is a J.C. Higgins sold by Sears model 50. Pristine condition. How big can I go? Are they worth using? Maybe smaller is better. (they are both .30-06) possibly 6.5-284? Any info will help. Thanks mtmuley