Dacron and other fillers are still used by some and data sources such as Loaddata still have recipes that include fillers posted. From my own research, not experience I hasten to add, the reason it is now discouraged is that there have been some very nasty incidents of blown guns and personal injuries. That's not the underlying reason tho. The problem is, no-one has been able to consistently reproduce any of the disastrous loads in a lab setting. So there is no known rhyme or reason for a load blowing up in your face. The exact same load that blows for one gun may work faultlessly in others for years. Indeed, in the same gun it finally blows in for many hundreds of rounds prior. So I guess its a bit like Russian roulette. It all depends on your appetite for risk. Just please don't shoot them next to me.
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