Do some research before you buy it. There was a recall on the .35 Whelens due to misfires. I think they even stopped making them for a while. The problem is that a single-shot headspaces off the shoulder and the .35 Whelen has a VERY tiny shoulder. Therefore, it is easy for the headspace to be off in a break-open Whelen.
That was several years ago.
They learned their lesson the hard way, and have corrected the issue.