I should add that I bought the 316299 because I knew my groove diameter all ran around 0.314" and throats around 0.315". It casts at 0.3155" (yes, I know tenths are elusive but let's say a hair under 0.316") using range scrap or wheelweights. It is enough over my sizing die that the gas check is swaged on well and the boolits is just sized to suit the throat. Perfect!
I have found that with certain loads, oven heat treating helps accuracy. Some recovered ACWW boolits showed wider grooves than lands on the boolits indicating a bit of swaging as the boolit engages the rifling. Oven heat treating solved that and improved accuracy. I blame it on a heavy boolit with short bearing area and fast twist (1:10") rifling. Just a bit too much rotational acceleration for the alloy and bearing area. Not a problem with light or moderate loads though.
No complaints. The mould casts to the size I want and boolits shoot well.
Longbow
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