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Under loading is wayy more dangerous than over loading
Because over loading will give you warnings that you’re pushing your luck
Undloading in some cases will to but in other cases such as a...

just buy a cheap 223
You should be able to get a single shot cheap or a cheap Norinco or something like a savage axis if you’re willing to drop a little more
Or a mate willing to lend you one ...

Trail boss is great stuff Velocity low probably to low for what you’re after like subsonic low
But it is really really good stuff

Reducing loads can be problematic for a few reasons
If the powder dose not fill the case and there is to much room in the case when the cartridge is lying flat in the rifle the powder is not up...