12 ga wad question

[Cold Spring]

Steve, the CB 1078-12 wad loaded with 7/8 ounce will sit a little low in Gun Club or STS hulls with lighter loads using Perfect Pattern powder because so little VOLUME is occupied by PP as compared with other familiar bur largely unavailable powders that require a much higher number powder bushing. PP is a modern high energy/low volume powder. I have many cases of 1078 wads on hand and use them ahead of PP powder though the crimp is a little low and dished. I've never used the 1075 wads (3/4 ounce) but I presume the column under the shot cup is a bit longer which will result in a flatter crimp when 1075's are loaded over PP powder and with 7/8 ounce of shot.

Times are changing with many of the old familiar bulky powders discontinued or only available at premium cost when the powder mills have extra capacity.

[Steve Hodges]

Thanks Frank that makes perfect sense. I do the same for 7/8 oz 20 ga loads in top gun hulls. I use a 3/4 oz wad and my crimp is perfect, where a 7/8 oz wad is dished out like you said.

[Double Lab]

What Frank said Steve. It has to do with the density of the powder. Actually wads have very little effect on the pressures in a load especially loads under 9k in 12ga. A good crimp is much more important in performance.