Just as BigBulls and Bowhuntercop stated, you will be fine. What you have more or less is an updated inline 50 cal capable of repeating 3 shots before reloading!!!!
I think the projectile is either a 44 or 45 cal in a sabot and like BigBulls said, it should be pushing the 1900fps mark and that will get ya fresh elk tortillas for supper!!! And I agree again with taking your 270 or '06 as a back-up gun, JIC.