Ohhhhhh, this is fun!
1. A bullet is lead and guilding metal(copper alloy) or similar...it isn't very hard, and if you hit the edge right, is not a big deal to cut. It could probably be done with a decent carbon steel kitchen knife.
2. There are swords that are like sharpened prybars....Japanese style configurations are not those swords, unless it is a Criswell.
3. A decent Japanese styled sword is not designed to cut wood....even if you successfully cut the wood, you have a very good chance of bending the blade, damaging the edge or seriously harming the handle...it is not a smart thing to do. Most decent Japanese styled swords are more akin to a sniper rifle than the bashers which are more akin to an AK-47, more finesse for the Japanese styled blade, less brute force....regardless of what you think you have seen or think you know.
4. Do yourself a favor and stick to European style bashers or machetes...you will have more fun, and minimize the risk of harming yourself or others doing something ill advised.
Best Regards,
STeven Garsson