We've certainly tried the 88 or 90 gram single use containers. Sold in 2 packs, marketed first by brass eagle then rebranded as a JT product, with the provided adaptors. That's a bit over 7x a 12 gram or a little over 3 oz so usually 250 to 300 shots, so certainly in the useful range for phantoms. I believe the availability of the adaptors led to some experiments with 16 and 33 gram threaded cartridges. I believe check valves and refilling were tried with varying degrees of success.