Thinking of all the ways this can go badly. There are quite a few.
1st ? Would normaly be how experienced a loader are you,but im guessing negative numbers here.
So lets start with why are you messing with this?
A primer launched bullet can kill you, ask brandon lee. If youre wrong about it having no powder things can get real interesting quickly. Ive been shooting for decades and coming close to my second decade loading. With my gear and my experience, i wouldnt think of blowing a primer with a bullet in the case much less an apparently unknown round.
next time you BBQ just drop the shell in the....no,no,no,no just kidding. If not using a rifle, then drill a hole in a 2x4 just large enough for the round to fit. Drill ALL the way through the board. Do not block the open end of the shell. Be positive there is no powder in the shell. Get your redneck neighbor to hit the primer with a nail and hammer. Seriously man, what are you doing? Just get a spent round and remove primer the safe way. If you need a spent round I'll send you one.
This has bad news written all over it. Just leave the stupid human tricks to other people and watch from a safe distance. Do a quick youtube search for someone striking a primer with a hammer. It looks the same, but the difference is: You won't lose a hand or die...
Bullet puller then run it through a resizing die with a decapping pin. It will push the primer back out. Or just leave the primer in the case but still pull the bullet to verify there is no powder charge. Just by shaking it will not tell you theres powder in it or not.
I've got a way better idea. Throw the damn thing away. Bury it. Something.
When I was younger I thought I would set a shot shell primer off in a vice (no shot or powder just a empty shell with a live primer). I clamped her down and hit a small screwdriver setting on the primer.
When it went off the primer cup ruptured and shot out of the pocket. Luckily the screwdriver went thru the cup and it ended up on the shaft of the screwdriver. Unluckily tho the pad of my finger was against the shaft of the screwdriver.
Took a good hunk out of my finger and I could just imagine what it would have done if the screwdriver shaft had not captured the cup and it had hit me.
Now......most gun shops sell a kinetic bullet puller that I have used many times to disassemble loaded rounds to check for bullet weight and powder charge. THAT is your best bet to stay out of the hospital.