I've settled on Clay Dot lately. Love it for 1 ounce loads. Trying to find a 7/8 ounce load I like with it now.
If Promo was working for you, why the switch to Clay Dot?
The cold weather issues, or something else?
I stated out with Red Dot then tried Promo because of cost and ability to use Red Dot data. Found a good deal on 16 pounds of Clay's and started working with it in various 7/8 and 1 ounce loads. After using it up I tried Clay Dot on the recommendation it is very similar to Clay's and Clay's data can be used for Clay Dot. Although I continue to try other combinations, my go to load for trap back to the 22 yard line is:
Rem Hull (Sport Load, Gun Club, STS, Nitro, etc..)
Win, NS, CCI, Cheddite primer
DR XL1-12 wad
Clay Dot 17.3 grains
1 ounce #8 mag shot
My chrono reads an average of 1225fps, 29fps spread, 15 load sample size. Used NS primers for this data. The other primers mentioned gave very similar results using 5 shot samples. Note: I don't reccomend freely subbing out primers. The load I'm using creates right around 8000psi per Alliant data. I am comfortable using other mild primers at this pressure.
Cost of Clay Dot is slightly more than Promo, but it takes less Clay Dot to make my current favorite so its not an issue for me. I also feel more of a recoil "shove" with Clay Dot as opposed to Promo and Red Dots "snap" on my sholder. The blooper issue in cold weather was with NS primers. Possibly a hotter primer would eliminate this problem. Alliant's 2012 data only shows one 1oz. load using a CCI209M primer. Nothing for a Fed209A.
I enjoy experimenting with various loads. Part of my enjoyment working with shotguns. Loading some Red Dot now that was made in 1975. It shoots great. Also picked up some 700x I have yet to try. For 1 1/8 loads I like International Clays. When its gone gonna try Green Dot. I'm certainly not knocking Promo and encourage you to try some. I wouldn't hesitate using it again.
Hope this long winded response helped.
Rob