I just made a grievous error!!
I went to a CAS match and got hooked, so of course new gun purchases must be made.
I bought a Puma lever gun in .357mag (while out of town on business). At the store, I asked the sales clerk to double check that the rifle held ten rounds. He disappeared behind into the back room and came back a minute later, said he checked the manual and said "Yep, it holds 10 rounds". So I bought it.
Brought the gun back to my hotel and went for dinner. When I got back, I carefully started to load the rifle (didn't want the Edmonton police swat team busting down my door). 1 through 6 went in pretty slick, 7 and 8 were a bit tougher, number 9 was a no go. I looked at the manual, the specs listed 10 round capacity for .357 in the 20" rifle, I bought the 16" OOPS OOPS OOPS OOPS I should have done the math (1.59" COAL X 10 = 15.9").
A mere hours old and never fired, the store would not, I repeat NOT give me a refund for the rifle.
If you are buying a Lever Gun for CAS, don't buy a sixteen inch