Only problem is the inside's usually hollow and the pressure is incredible . No real safe way to do it. A plunge cut won't help. Only time I've ever had a saw knocked out of my hands. This was a baby..
A mature black locust will burn without a hint of sizzle. All the moisture is in the sapwood. If we have a long firewood season and I'm out of seasoned wood I'll take down a few big old trees. Hate to do it but it's money.