Generally speaking, stone powder is not used in carving barrels, especially the knives are more exquisite. Austrian AB barrel is definitely a powder barrel, which is a patent of others; Altiny's bucket is often spit out as a suspected powder bucket;
Try to buy big brands and hand-made buckets. Sms, imp and wgm are all very safe stone barrels, and the price and workmanship are OK. As for the master of Turkey, it is even more manual fighting.