Hi smle.
To what I see they are not very common & I looked for a long time for a good one.
If you have had that gun in hand & confirmed that it locks up tight, best that you buy it before I do.
I have a Skimmin & Wood in that chambering & proof & love it even though it is heavy.
Like already stated, don't use 3 inch magnum loads in it.
I use up to 36 gram Eley AAA 2 3/4 loads in mine.
You do as you feel safe doing according to the condition of the gun.
O.M