Funny you should mention that Son. Several years ago we were required to fire a Boys on the Field Firing range and I was charged with formulating the range safety template for this beast. No CURRENT info was available. Because of that it looked like the event would be cancelled. Many phone calls later and it was agreed that with a bit of fuzzy logic combined with obfuscation plus a good dollop of creative range order writing, the .55" Boys became a .50" Barratt. I think the safety range was nearly 7miles. And the range day took place. There was plenty of .55" ammo too so I let my son then age 13 or so have a go. Didn't seem to bother him too much.

The Boys cut straight through a Ferret armoured reccy. vehicle like a knife through butter and a satisfying metallic '.....ping.....'.