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Trailboss powder loading formula

22270 Views 16 Replies 9 Participants Last post by  Lane
I was on another forum and there is a bit of a disagreement on the loading of Trailboss powder. IMR load data shows a max load for 45 colt of 5.8gr at about 12,700psi with a 250/255gr bullet. Also on IMR website (same site as load data) there is a couple paragraphs describing how to come up with "your" reduced load using said powder. This is accomplished by determining the space your bullet occupies in the case and filling the case with powder to that point. (NO COMPRESSING) weigh this amount and this becomes your MAXIMUM load. Use 70% of this amount for a start load and work up toward your max load looking for the most accurate loading for your gun. My measurements are: 45 colt starline brass, 255gr Lee RNFP, I can get 8.5gr of trailboss up to bottom of bullet with no compression, this would be my MAX load, 70% of this is 5.9gr as a start load. As you can see this is over the max load info of 5.8gr. in the load data. WTF over..:confused: anybody got an answer for this one?? Don't say call Hodgden, tried that, they ain't talkin..Another question, if the 5.8gr. load has approx the same pressure as say, 8gr. of Unique why is the recoil so much less? Seems like every time I increase pressure in a load the recoil factor goes up...I may be sly like fox, but I'm also smart like tractor..
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Trail Boss

I've loaded Trail Boss with full case load= Not compressed:
in 30-06, .243, 17Rem, 204Ruger, 45-70, 41mag, 38, 44mag, 45Colt, 22Hornet,
With lead and jacketed bullets in all wieght ranges.

I get about half the speed of regular powder loads in all calibers. And Never any signs of pressure.

Trail Boss is my favorite plinking AND low recoil- up close hunting powder;):cool:

Always give it some breathing room...Never compress and you'll be fine:)
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No, I'm not confusing myself, IMR is doing that quite well by themselves. From their website: quote: (1) "Find where the base of the bullet to be loaded is located in the case and make a mark on the outside of the case at this location. Then fill the case to that mark with Trailboss, pour into scale pan and weigh. This is your maximum load. Pressures will be BELOW the MAXIMUM allowed for this cartridge and perfectly SAFE to use!" end quote.

In practice, this IS perfect. TB is so under-powered, grain for grain by wieght or by volume, it has less power than Black Powder!

Just Do Not Compress, and your loads will be Fine :)
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