The Firing Line Forums - View Single Post - Trail Boss for 45-70 loads

**Unclenick** · August 27, 2011, 08:14 AM

TrailBoss is has even lower bulk density than SR4759. From Lee's VMD chart, SR4759 is 0.653 grams/cc. Trail Boss is just 0.298 grams/cc, so it takes up a little over twice as much space per gain. It's got the lowest bulk density of any powder on Lee's list. It burns fast, like a pistol powder, but you can't fit enough in to damage a modern rifle. That means the velocity it produces is limited. It's only hazard is you can't compress it at all without risking pressure spikes.

The IMR load Trail Boss instructions are here.

August 27, 2011, 08:14 AM	#8
Unclenick Staff Join Date: March 4, 2005 Location: Ohio Posts: 21,061	TrailBoss is has even lower bulk density than SR4759. From Lee's VMD chart, SR4759 is 0.653 grams/cc. Trail Boss is just 0.298 grams/cc, so it takes up a little over twice as much space per gain. It's got the lowest bulk density of any powder on Lee's list. It burns fast, like a pistol powder, but you can't fit enough in to damage a modern rifle. That means the velocity it produces is limited. It's only hazard is you can't compress it at all without risking pressure spikes. The IMR load Trail Boss instructions are here. __________________ Gunsite Orange Hat Family Member CMP Certified GSM Master Instructor NRA Certified Rifle Instructor NRA Benefactor Member and Golden Eagle