If you want to know about how well a particular bullet shoots in a 270, load 55 gr of RL19 with the 130 gr missile of choice. Seat (usually) as long as the magazine box will allow. (I know there can be a lot of variation here, so optimize for your rifle.) This is not usually close to a max load, but this is a very specific experiment. It might not be too bad a load for a youngster.
If your bullet doesn’t shoot ‘3’s, try something else. High quality rifles will do it every time.
