Different primers can cause extreme pressure spikes with this powder unlike anything I've experienced with my many other powders. Hodgdon's website lists a minimum load of 14.5gr with a 40 grain Vmax, and 16gr as maximum using a Rem 7 1/2 primer. Tests with 15.5gr and Rem7 1/2 gave tame results. This week I did more 15.5 gr loads to see how WSR and BR4 might affect accuracy. The primers were flattened like a pancake, and I had trouble lifting the Rem 700 bolt! This was in 52° temp. Glad I didn't start at 16gr! Be extra careful when using LilGun. And don't forget to wear glasses when testing new loads.