Let's see--

Give him $$$expense, They are $$pricey!!

*Range--no issue on DG,why would I want to shoot them at 150yds anyway??
*Flexibility- one bestload, one type bullet is what I use for my big Bolts.The Double hits to roughly the same POI with 2 types of bullets at a killing velocity.Sounds like a better "load" to me!!

*Reliability-the Double wins, one load at low pressure & medium velocity will win in hot conditions over high pressure, high velocity with a frozen bolt!!

*Reloading-Not a contest, the Double will be faster ever time!!

Sounds like the guy wants a Double and can't have one!!