Well, H4831,
If you consider it that way, then I agree with you. But, in reality 5 000 PSI is quite a bit of a difference... it's the difference between a "standard" "modern" load and a "modern" "magnum" load... Not many loads goes over 65 000 PSIG though... (maybe except the .280 Halger... wich some cold blooded men may still be shooting...)
Sir Springer,
I don't have time for now to take apart my Model "B" but the only "time" there was no viewer's stamps was between 1941 and 1950 (re-started with A B). So, if you have a very, very early BSA sproting rifle it may not have the "viewer's" mark. Let me have a look at my own rifle and i'll let you know what's going on.
And, finally, yes, there was a model "B" wich was the M/17/P-14 with the sight "ears" milled down, using the cut-down military stock tapped for peep sight or later with both peep and scope drilled and tapped holes, a model "D" wich was basically the same, but with a purpose built sporting stock, the model "E" with a lighweight "continental" style stock. All these rifles were marketed by Parker-Hale.