Please forgive (again) a reloading neophyte. After I first got my Model 500, I started handloading 440 gr Cast Perf bullets and the original Starline brass with 37 grains of Lil' Gun (which was in the middle of Cor-Bon's listed range of 35-39 grains). Now I see where Cor-Bon has lowered the limits to where 35 grains is the max (this is going from memory, since I get "dinged" for accessing certain gun sites using company internet access here at work).

I've since learned that I should always start out at the min load and not from a middle load, but that doesn't help me on these cartridges. Should I pull all the loads I've already loaded, or are they safe to shoot? The dozens that I've shot kick like a mule, but don't show any signs of overpressure. But now after seeing the revised lowered maximums, I'm hestiant to shoot any more for fear of gun (or shooter) damage.

Here is the MAXIMUM Cor-Bon data from their original load data:

"440gr Hard Cast 40.2 gr Lil’Gun 1,707 fps 1.995" CCI 350 Corbon
Max load. Velocity from an 8 3/8" revolver, pressure is below 50,000 PSI."

The data you see now is data linked to the Hodgdons site.
Now it is up to you to determine if your loads are safe.

Would I use them? YES but if I were concerned from now on I would use Hodgdons data.

Cor-Bon loads (except the 275 gr loads) are hot. The 400 gr load using the Sierra 400 gr Jacketed bullet runs 1810 from a 500 Encore with a 10 inch barrel. It takes 42 gr of my H110 to equal them.

As I said before I would use them myself and wouldn't worry one bit. That is me not you so use your own judgement.

I would follow the Hodgdon's powder charts and not worry to much. As long as your cases are not sticking your doing fine. That Corbon 440 load wears me out in short order! I reload using the lighter bullets and go for the muzzle flash to show off the gun. This gun is lot's of fun!

I would shoot them, unless you really don't like the way they shoot. I doubt safety is the issue. It might also depend on how many you loaded. When I try new loads, I load a box of 50-100 at different amounts of powder, take the crono, and look at the grouping. I usually even go above the max loads by several grains to get a feel of the powder and the possibilities. I record all of the information that I get. Right now, Accurate #9 is my powder of choice for my .500's. H4227 comes in a close second. I tried Lil Gun but I didn't like it in the .500.