Trail Boss (IMR or Hodgdon) is especially made for large cases. It is my unqualified recommendation for the best first powder to try when getting into reloading handguns (ideally a popular revolver cartridge). But it has features you will never outgrow.
Bottom Line: 👍 Fantastic for light loads, especially in large magnum or black-powder-era cases. Very safe and easy to work with.
- Safe. Bulk makes double-charges easy to spot (all published loads I’ve seen will literally overflow if double-charged).
- Excellent case-fill may promote accuracy.
- Acceptable accuracy when working quickly with an old-fashioned dipper, because variations in volume have less impact.
- To work up a load with an unknown cases, 70% case-fill to start, 100% case-fill MAX. Safe with nearly everything (not OK for 50BMG, but yes for 458 Win Mag). No really, it is officially that easy
- Lots of static cling because it’s light and fluffy.
- Limited to light loads only, unlike some classic light powders (e.g Bullseye) it can’t also be used for “duty” level loads.
Density (per Lee dipper chart) 6 grains/cc
|Lee dipper||Grains Actual (measured)||Nominal (chart)|