wildcatter wrote:Is it just me or.. but 185/160grainers, L Gun sounds a little slow. For accuracy and some more velocity you might try AA4100, AA 9 or maybe 2400, in that order, 4100 being a little faster that Lil gun #9 being a lil faster than 4100 and 2400 being even still faster yet. I don't know I don't shoot the truly light weights, even though they sound very interesting.
T-
A real problem with trying to load bullets lighter than 200 grains in the 450B is the lack of tested pressure and loading data for any powder. Hornady shows nothing lighter than 240 grains, and Accurate/Ramshot tested no bullets lighter than 200. These lower weight limits are reasonable, because going below them often requires use of reloading techniques such as side-crimping, which is a large upward step in technical difficulty.
Perhaps more importantly, there is little practical use for bullets lighter than 200 grains. (Possibly I'm insufficiently imaginative.) Experimenting with them is fun and can be educational, sort of analogous to the construction and racing of top fuel dragsters. However, bullets under 200 grains in the 450B seem to me to be sub-optimal and not appropriate for other than experiments or plinking.
The progression of powders you suggested is about right, although I've found in some experiments with really light bullets that some of the rank order will change. Part of the problem I can't sort out concerns pressures suitable for the ARs. Blue Dot can be useful. Winchester 571, although having a charted burn speed that looks useful, is in fact not because of the requirement for case filling. As Hoot has found, 2400 can get tricky, with small increases in powder weight producing large increases in pressure.
--Bob