My hunting partner has one. Inside about 5 feet its is accurate enough with birdshot to kill snakes. Any further than that and the Doughnut of Death shows up.
As for shooting 45 LC out of it... Lets just say that it is MAYBE accurate enough to commit self-deletion with if you use all 5 rounds...
I have a very early version of the CA MPR that started out in 300 PRC. Two barrels of 300 PRC later I went with a 6.5 PRC for the 3rd barrel. It shot in the 0.3-0.45" for 3 shots at 100y with both 300 PRC barrels. Haven't shot the 6.5 barrel yet enough to find a load for it.
My two elk hunting...
Hogue Overmold stock for a RH Howa LA.
Has been modified to work with Sendero profile barrels and painted
$75 OBO/TRADE
I'll cover shipping to the lower 48