ALF-99 how cold is cold to you? I live in WNY and do alot of shooting in NWPA and WNY the temps in the winter can be from -20 deg. up to and sometimes over 40 deg. I have not spoken to anyone in my area that is useing it and thought I would try it.
Best of the faster burn speed shotgun powders IMO. Very well suited to 7/8 oz, 1 oz, and 2 3/4 dram 1 1/8 oz loads. I prefer Green Dot for faster 1 1/8 oz loads.
I'm about to open my 5th or 6th 8 lb jug of e3. Consistent jug to jug, consistent drops, low to moderate pressures, clean, I've never had trouble with it in the cold (NW PA shooter), low charge weights, and due to those low charge weights, when you work the cost out by shell it winds up being less expensive than the rest of the competition except for Promo.
I like it and have used about 32 lbs. I load 16.5 grains in a STS hull, Remington TGT12S wad, Remington 209P primer and 1 oz of hard 8's. This load crimps well and is about 1150 fps. It shoots very soft and consistent in all weather and really gives nice breaks. It is also very clean.
e3 is also my favorite 1oz powder. My favorite load used to be school teacher's, but I've bumped it to 17gr, because I'm, trying to get everything clustered around 1200fps. Try some, you won't regret it.
One note of warning, it will melt polycarbonate powder hoppers if you don't drain it between loading sessions. There is any easy fix, but I learned the hard way.
Since someone asked, I'll post the fix again. I went to Staples and bought a package of Wilson Jones View Tab transparent dividers. They are made of a poly material. If you Google wilson jones transparent view tab dividers 55066, you'll find them (also listed as Acco/Wilson Jones).
Clean your powder hopper. Then cut the three ring binder holes and the tab off one of the dividers. Coil and insert into your powder hopper. It will expand to line your hopper. The "poly" material is impervious to the abundant nitroglycerin in e3, TightGroup, etc. You can leave your hopped filled for years with no ill effects. It is also anti-static.