Another reason is Black powder will give you very close to identical ballistics whether in the Arctic or on the Equator.
A "Low Pressure" load of 7625 at low temps may leave you with a wad in the bore. Guess How I Know, it happened to me in a Duck Swamp ""ONCE"". I swore off 7625 for low pressure Forever that Day. The Factor which allows a smokeless powder to generate low pressures are inhibitors to the burn rate of the powder. These inhibitors also make it harder to ignite & they do not burn well except at higher pressures. Black Powder has a natural burn rate which is very suitable to shotguns, is easy to ignite & burns reliably & at about the same rate at virtually any pressure level. Burn rate of smokeless is very pressure sensitive. Best low pressure loads with smokeless are light loads with faster powders, which are not so heavily coated with inhibitors.
