Tinker, I haven't had any pressure testing done on any of my loads, which is why I generally keep them WELL below minimum if I can find a load that regulates. I'd love to have some tested, but living in AK complicates things (hazmat) and some of my bore guns have 'odd' sizes (1.005", .827", .875") so I've just assumed no on had an appropriate pressure barrel.

All of the pressure data that I have seen on 8, 10, and 12 bore rifles unanimously show that Blue Dot gives an equal or lower pressure then BP loads with the same velocity. That having been said, we all know even the slightest change in a load can have a big effect on pressure and I don't want to discover the exception to the rule!!! Additionally, Blue Dot loads require a hefty wad column due to its low bulk, so you can't load one exactly the same as with BP. In 4" 4-bore I put three 1" felt wads over the card vs one with 12 drams of FFg and 1/2" with 14.

I don't pretend to understand the voodoo that goes on inside the barrel, but my 10-bore would only regulate with Swiss FFFg at 1300fps. I fired Blue Dot loads from 1100fps to 1450fps and they all cross horribly at 30 yards, as did all of the various Goex F, FFg, FFFg, and cartridge loads I tried. For whatever reason the swiss has the right pressure curve and recoil to make things work and the holes touch at 50, so while I sing the praises of Blue Dot it doesn't work for every gun. With bigger rifles the BD loads are vastly more comfortable than BP and have a 'crisper' feel to them. In my 4 the recoil feels like a load with 3-4 drams less powder for a given speed. From my shooting it seems like about 70 grains of Blue dot gives about the same velocity as 10 drams of Goex FFg in 4 and 8 bore, but it is not a direct 7 grains=1 dram equivilent above and below there in my experience. Other folks here probably have more experience with that.

I haven't shot anything with the 8, but will take it to Darwin next summer and can't wait!

Bob