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I assume you have never heard of a "potato cannon", or you never played with blowguns made out of a pen case and paper balls as a kid.

Tight seal between the barrel and the projectile is needed only to maximize the usage of the explosive power and prevent losses by allowing gases to escape, otherwise you will get propulsion anyway.

There are even historical evidences where desperate defenders, having run out of proper ammunition, loaded their cannons with coins and cutlery.

If you want something handheld, in the very basic configuration you need a pipe closed at one end, an explosive and your beans. Put the explosive in, then the beans, fire the explosive while aiming in the general direction of your target.

Beans can be used. The only thing is that if they are cooked they won't withstand the jolt of the explosion and will likely be splattered.

You can even load the pipe with the whole can of canned beam, to increase the damage on the target.

I assume you have never heard of a "potato cannon", or you never played with blowguns made out of a pen case and paper balls as a kid.

Tight seal between the barrel and the projectile is needed only to maximize the usage of the explosive power and prevent losses by allowing gases to escape, otherwise you will get propulsion anyway.

There are even historical evidences where desperate defenders, having run out of proper ammunition, loaded their cannons with coins and cutlery.

If you want something handheld, in the very basic configuration you need a pipe closed at one end, an explosive and your beans. Put the explosive in, then the beans, fire the explosive while aiming in the general direction of your target.

Beans can be used too. The only thing is that if they are cooked they won't withstand the jolt of the explosion and will likely be splattered.

You can even load the pipe with the whole can of canned beans, to increase the damage on the target.

I assume you have never heard of a "potato cannon", or you never played with blowguns made out of a pen case and paper balls as a kid.

Tight seal between the barrel and the projectile is needed only to maximize the usage of the explosive power and prevent losses by allowing gases to escape, otherwise you will get propulsion anyway.

There are even historical evidences where desperate defenders, having run out of proper ammunition, loaded their cannons with coins and cutlery.

If you want something handheld, in the very basic configuration you need a pipe closed at one end, an explosive and your beans. Put the explosive in, then the beans, fire the explosive while aiming in the general direction of your target.

Beans can be used. The only thing is that if they are cooked they won't withstand the jolt of the explosion and will likely be splattered.

I assume you have never heard of a "potato cannon", or you never played with blowguns made out of a pen case and paper balls as a kid.

Tight seal between the barrel and the projectile is needed only to maximize the usage of the explosive power and prevent losses by allowing gases to escape, otherwise you will get propulsion anyway.

There are even historical evidences where desperate defenders, having run out of proper ammunition, loaded their cannons with coins and cutlery.

If you want something handheld, in the very basic configuration you need a pipe closed at one end, an explosive and your beans. Put the explosive in, then the beans, fire the explosive while aiming in the general direction of your target.

Beans can be used. The only thing is that if they are cooked they won't withstand the jolt of the explosion and will likely be splattered.

You can even load the pipe with the whole can of canned beam, to increase the damage on the target.

I assume you have never heard of a "potato cannon", or you never played with blowguns made out of a pen case and paper balls as a kid.

Tight seal between the barrel and the projectile is needed only to maximize the usage of the explosive power and prevent losses by allowing gases to escape, otherwise you will get propulsion anyway.

There are even historical evidences where desperate defenders, having run out of proper ammunition, loaded their cannons with coins and cutlery.

Beans can be used. The only thing is that if they are cooked they won't withstand the jolt of the explosion and will likely be splattered.

I assume you have never heard of a "potato cannon", or you never played with blowguns made out of a pen case and paper balls as a kid.

Tight seal between the barrel and the projectile is needed only to maximize the usage of the explosive power and prevent losses by allowing gases to escape, otherwise you will get propulsion anyway.

There are even historical evidences where desperate defenders, having run out of proper ammunition, loaded their cannons with coins and cutlery.

If you want something handheld, in the very basic configuration you need a pipe closed at one end, an explosive and your beans. Put the explosive in, then the beans, fire the explosive while aiming in the general direction of your target.

Beans can be used. The only thing is that if they are cooked they won't withstand the jolt of the explosion and will likely be splattered.