I agree, the greatest training round available. Very accurate and challenging to shoot at longer ranges. OP could put thousands of rounds downrange while learning to dope wind for a fraction of any centerfire round.
I take it you have never tried rimfire at 200yds? There is nothing boring about it and you learn to really shoot instead of have the calibre cover for bad habits. The fact that it can be done for vastly lower cost is icing on the cake.
Mark
this^^^^^