I recently got a paper cartridge kit from Guns of the West and really enjoy it, however, the cartridges I make do not stay tight. Most of the cartridges feel perfect when I first set them aside but when I hold one by its midsection the powder begins to compress more and the cartridge loses the rigidity it once had. Am I not compressing the powder enough to begin with or could it be something else? Does anyone experience this when they make paper cartridges? Thank you.