The big hangup is primer production. Look into how these are made. To fill and cap them, they are assembled in small rooms just big enough for one person. These rooms are usually built on the side of the facility with a weak wall facing out so if it blows it doesn't harm anyone else. They seem like large coffins. The facility is usually out in the boonies as zoning in cities usually doesn't allow for high explosive use. Also apparently this is a job mostly filled with women as they tend to have more dexterity and concentration. So to increase production you need women living outside cities that are willing to work in dangerous and depressing conditions. Hard sell for most I'm sure. Looked into it a few years back as it seemed a business that will never run out of customers. It's not surprising you don't see new people in the market, only old dogs.