laughing out loud.
you'll be writing that book if you expect to see it published somewhere.
here is a little secret.
LEE also extrapolates data from one cartridge to another, close-nuff plus/minus 10% to compensate for case capacity
think about it more like this.
take any 357 magnum load you can think of,, any one.
how many of them are also 38 special or 38 special plus-P loads?
now take any one of those loads and put them in a bigger case like the 357 Maximum, you automatically drop the pressure by 25% [the H-110 load probably won't even light off]
since we all know unique let's look at what happens and how we derive a sane safe useful load.
drop that 357 in a lever rifle and shoot it over a chronograph and you'll see about 1150-1200 fps.
now move that load over to your 30-30.
150grs--158grs.
6grs of unique
6grs of unique
1cc of case capacity
6 cc's of case capacity
Boyle's law automatically says you decreased the pressure by half for every unit forward/away from the gas source.
so before you even pull the trigger you have a 30% decrease in pressure.
now factor in the gas volume outside the going away straight line part and you drop another 10%.
your velocity will also drop so you have to add more gas volume to fill in the gaps.
add .6grs to fill in the edges.
add in another 25% to fill in the straight line that gets you to 8.1grs and your back inline with the 1200 fps you started at.
you will of course have less room in the barrel for a slightly different bore expansion ratio but your trading it off by having the bullet further away from the gas source.
working up instead of down is preferable and even safer when load swapping.
take your average 7mm-08 load, it probably uses a powder a bit on the too slow side for your average 308 load.
taking it and directly dumping it into a 308 case and seating a longer bullet [like from 140grs to 165grs] isn't going to peg the meter on the pressure gauge.
in fact it's gonna need more powder to shoot anywhere near efficient.
substituting in a cast bullet will lower the speed and pressure into something that will work just fine for ''higher-ish velocity'' cast bullet shooting.
no data whatsoever never will be never was but is more than safe,, the book said so sorta, just not for your exact combination.
to take it even further off the rails.
do you shoot any LEE bullets?
how about Accurate? NOE? NEI? MP? Ideal? CBE?
none of them have any generated data in a book anywhere, I'd go so far as to say Magma Engineering molds have double the data as all them put together have. [you never heard of them?]
they are all ''off the book'',,,, yeah but [shrug] yeah it makes a difference,, they don't have the same friction value, same lube grooves, same engraving pressure, seat to the same depth... all of that adds up and matters.