I have made myself a pistol (still unfinished... like so many other projects the past few years) and stocked it in ash. It is very interesting wood. Has good points and bad points. One surprising thing is how it cuts. It will cut VERY cleanly, even cutting into the grain!!! Usually, when inletting a gun barrel, the bottom of the channel at the very breech end gets kinda rough. No matter how sharp my chisels, it's still hard to cut back into the grain without it digging in and hogging out chunks (the grain will be angled here so that I can get at least some grain running all the way through the wrist of the gun) . Not so with ash. I was amazed. The cleanest barrel breech inlet I ever done. Perfectly smooth with ZERO digging into the angled grain. On the other hand, my lock inletting doesn't look so good in the bottom. The porous rings are weak, and there's just nothing there and it just collapsed under my chisels. It's fine, though, just not pretty. For the same reason, you have to be very careful in the final shaping/smoothing of the surface, since whatever tool you use will want to hog out the porous grain and make creases in the stock surface. Another problem I encountered, due to the porous rings, was that my front barrel tenon was real close to the muzzle and real close to the rod pipe tenon. AND there is a nearly perfectly vertical porous ring layer dead center right down the stock where the tenons are. POP. Ok, no problem. I glued it back together and also, just behind the muzzle, inletted in a strip of straight grain walnut wood that I bent into a curve to fit the barrel, fitted well, and glued in place to hold the fore end together (kinda like they used to do with those thin Browning shotgun fore ends). It seems pretty solid now.
I've practiced a little carving on ash, and actually, I find that it carves quite beautifully. You do have to be careful with the rings, of course. Keep the carving relatively simple, and it will really look good. The rings can visually interrupt the carving, but if the grain of the stock is properly filled, there will be no pores showing.
I have an ash blank here that I've had for years. The butt end is from near the root of the tree, has a natural curve and is quite curly. I've actually been afraid to cut into it!