Interesting choice. There'd only be about 160 pellets in that load given the density. I'd have enough penetration to kill at 100yd+. A common rule of thumb with HTL shot, including tungsten, is patterns degrade by 30% every 10yd beyond 40yd. I've found that to be more or less accurate out to 70yd, but haven't patterned beyond that range.
Your load is good only to 50-55yd before density thins to 100 pellets in the 10" if that rule of thumb holds true. Of course, you may have an outlier there as I've never heard of any load that will consistently deliver 80-90% in the 10" at 40yd. I've had a few loads at 60% during summer dog days when temps are in the low- to mid-80s early in the morning with humidity levels over 80% and no wind -- essentially when the air is thinnest and most stable.
