Tamachi are absolute shit. They jam in AEGs, Systemas, pistols, sprinters, GBBRs, etc. I've seen few guns shoot them properly and many jam and chop repeatedly.
Bastard makes heavier BBs, but bios only go up to 0.28g. If you want heavier weight than that, order them from a quality company. Don't risk your gun with crap. If you need BBs right now, just grab a bag of high quality 0.28s like Bastards to get you through.
ďREALITY IS LIKE A STONE. TO MANY ITíS HARD AND COLD, THEY CANíT HUG IT OR EAT IT, IT ONLY FRUSTERATES THEM AND DOESNíT DO THEM MUCH GOOD. TO OTHERS ITíS STRONG AND DEPENDABLE, YOU CAN BUILD WITH IT, BUILD UPON IT, OR WORK WITH IT, ALSO USE IT TO SMASH PEOPLE IN THE FACE.Ē