ORIGINAL: Arthur P
The industrystandard is to warranty their bowsdown to arrow weights at 5 grains per pound. (Other than High Country that is; they go down to 3 gpp on a couple of select models they make.) The manufacturersdo not recommend going that low on arrow weight, but they had to warranty their bows that waybecause of their "IBO rating" advertising.AMO (now ATA) hasnever amended that recommended arrow weight chart doegirl linked to, and that should tell folks something.
Well, if that's the case 78 X 5 = 390.
Bucketmouthhauler, I owe you an apology. You're 392 grain arrows are within the safe minimum. Now go enjoy that extra speed.