I've never found Trail Boss to be a good powder for anything. Don't bother. If you lived near me, you could have what's left of mine for free.
I assume you mean cast? For shooting heavy cast hunting bullets at 1800+ fps from military rifles, 4895 was the gold standard for many years. 4198 would be worth a try. I've burned pounds of XMP5744 (the old kind) in .35 Remington and .30-06. There's numerous slow pistol powders that work for plain base cast in large cases. AA#9, Ramshot Enforcer, 4100 and 300-MP are being used by Schuetzen competitors who launch at 1450+/- fps. I've had some startlingly good results in 7.5x55 using Blue Dot, shooting a hard cast 180 grainer at 2200 fps in the strong K31 rifle. Some milsurp cast bullet shooters are using reduced loads of Varget, or so I've been told by one of them. For really light loads, (subsonic), Red Dot is a good choice.
Should add that there is no printed data for a lot of those powders when used in cast bullet rifles. I work everything up in Quickload before loading for range testing.
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