The challenge is to find a fund/etf, etc. that has less volitility and better return that PTTRX. And by volitiity, i mean no dips when the market tanks. This website graph includes div in total return for stocks/mutuals, etc.
I don't think beta is the right term to use, I could be wrong but I think a perfectly flat line with a slope up has worse beta than a flat level line. So using stock screener looking for low beta stocks/funds hasn't done well.
look at results over 5, 10 and 3 year
PTTRX Chart PIMCO Total Return Instl Fund Chart