It really depends on what you want. Springfield leather sells the synthetic sheep skin in half yard and that is enough for a rifle case. You can get it in 3/4 inch and inch and a half. Like I said earlier I am very happy with it.
I have made many rifle cases using synthetic sheep skin from tandy and Springfield leather and they are very nice and they are holding up like the day I sent them to my customers and no complaints.
alzilla there is no one machine that does it all. A cobra 4 is Great for saddle makers and holster makers but if you are sewing wallet interiors it is to much. So what is it that you are doing.