Thing about Trail Boss is that it's fast powder but it has a very low specific energy content.  i.e. it builds pressure fast but that pressure is not sustained as the bullet travels down the barrel.  Good for pistols, not so good for rifles.  A larger charge of something slower is a better bet for a rifle. In the computer model a charge of 6.2 grains of 2400 would get you over 1800  fps, for the same peak pressure as that 3.0 charge of Trail Boss, which will not even break 1400 fps, all other things being equal. (That's assuming a 45 grain jacketed bullet. An equal weight cast bullet will go slower at lower pressures, owing to the lesser  initial engraving force.)

In these days of famine, better-suited powders may not be obtainable, so we have to use what we can get. 

This is why I love Quickload.  You can "try out" dozens of possibilities without ever actually loading a single round. It won't ever give you a fine-tuned optimum load, but it will help you see what loads are not going work well, and why.

It's a ballistics software.  My copy runs on a Windows laptop.   

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Old Soldier wrote on Dec 3^rd, 2020 at 7:16pm:


That would be awesome,  yes please. 

Retreever

Um.......have you read the thread?

Old Soldier wrote on Dec 7^th, 2020 at 1:22pm:


Thanks much appreciated 

Roger

This ought to do it.

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Still leaves you without a bullet seating die, though, and it'll size too small for plain lead bullets.

You need a Lyman M expander die like this (You need to Login or Register to view media files and links)
2 dies sets are for jacketed bullets and don't give the little expansion needed for lead ones. 3 die sets include the expander.