Yes, regulation is spot-on for a number of loads:

(all use Hornady brass and either CCI or Federal magnum primers)

106gn AR2209 570gn Woodleigh (FMJ or RN)
106gn AR2209 430gn Woodleigh RN
103gn AR2209 600gn North Fork (mono)
56gn AR2207 430gn cast with cotton wool filler
34gn Trailboss (full case) 430gn cast (chrono'd at 1,460fps)

This is the North Fork:

The 430gn cast are from a custom Mountain Mold and look like this:

A handy feature of the rifle is that it will consistently fire both barrels automatically, almost simultaneously, if the rear trigger (left barrel) is pulled first but only when using the 570gn or 600gn loads.