Originally Posted by bloodtrail
You can set one up to run full loads or sub loads. I haven’t tried but heard it’s difficult or impossible to cycle both. I’m not advising to do this but I’ve read that you can not over pressure a 223 using trail boss. You can mark the case where the bottom of the bullet is seated and start there working down to 70% of that load. In that range you should find 1050fps.
Cycling a reduced load in the 1300-1500 range would be easier than a sub load.


I believe your correct, assuming you do NOT compress the load. Trail boss burn rate has a lot to do with the shape of the powder (little donuts) and it you crush those all bets are off. I really am not sure you can get to 1500 with trail boss and a heavy bullet tho. Maybe with a 40 vmax, possibly with a 55. I LOVE TB for reduced revolver loads. You can make mouse fart 38 specials that are a hoot to shoot and crazy accurate at short range.

Jason