Originally Posted by
stencollector
Yes. They are frequently done for two reasons. In the US the primary reason is because at 55 cal it is a destructive device. Conversion to 50BMG turns it back into just a rifle. Here in Canada most are done so that they can actually be shot without having to spend $25 to $50 a shot for original ammunition, and that is when you can find it. There is no steady source for the ammo.
Now queue the guys who are going to tell us that you can fire form BMG ammo into 55, or else solder on the headspacing band onto the rear of the case. And that you can buy bullets from Australia, and how easy they will be to reload.
I took the easy route and changed mine over to a Kreiger match grade 50BMG. I have actually done 3 of them over the years. You can put the original profile on the barrel, and with a slight modification to the magazines, feed the BMG from a magazine.
Sure there are cheaper 50s out there, but none with the fine lines and superfluous machining of the Boys rifle. They are a work of industrial art.