RE: What Grain Powerbelt
1) Many folks want bigger bullets because one shot is all we get. Plus some of these same folks also want more value for their dollars spent. Getting a 450 gr bullet for the same price as the 180 gr bullet pleases them.
2) Also... MLs are different from one to the next. What works good in barrel #1001 coming down the factory manufacturing linemay not work good in barrel #1002. Also what works well at 100 yards (2" groups) may not do well from 150-200 yards.