247gr case boolit load data needed

[ohnomrbillk]

The Cast Boolits forum ran a group buy on a mold for the 300 Whisper/blackout/WTFever.

Does anyone have any load data for this bullet?

[sten668]

I have tried 10 grains of 5744 and 1680 for right at 1050fps , 16in M1S barell, carbine gas tube, neither load will hold the bolt open on last shot. They will strip a fresh round most of the time. Still a work in progress, I am working on an adjustable spring set up. It loves TNTs super sonic. BTW 5744 is much more quiet than the 1680 out of the AR or my bolt gun.

[gds]

I am using 10.1 gr of 1680 on a 9.5inch 1 in 8.5 twist barrel with pistol gas tube. Cycles great it is subsonic but not sure what speed, my chrony stopped working. Took a small doe with it last night.

[thehouseproduct]

Anyone have a good calculated BC for this boolit?

[gds]

I have tried to find a BC for it but have not been able to