Yeah you're right, all SKS D are last shot closed. And you shouldn't have to hold the bolt open. The spring in the mag should allow you to push the loaded mag right into the well, depressing the top round. When the bolt is pulled back, the top round is pushed up enough by the spring to be caught with the falling bolt and chambered. I noticed too that the mags take a bit of fiddling to seat right.The trick seems to be to seat the front and use some force to pull it to the rear and lock. Large cap would make it easier as you have more area to grab and leverage The only good thing I see with the D is the ability to have a large cap mag for looks. But I think if you had a bunch of loaded mags on hand, you could give the stripper clip a run for the money"