You would think a single-base powder
(i.e., the so-called "cooler" powders) has a longer throat life than a double-base powder because the nitroglycerin in the double-base powder increases the flame temperature.
A single-base powder
contains nitrocellulose, whereas a double-base powder contains nitrocellulose and nitroglycerine.
European shotshell manufacturers universally use single-base powders
(made exclusively of nitro cellulose) that's made by soaking cotton in nitric acid.
In addition to ammunition, CBC produces a line of single-base powders
that is available through various channels here in the United States.