BSA also made some high grade sporters on p-14, m-17 receivers in the 1920’s. They were made in their own proprietary cartridges, I have seen ones in .33 BSA and .40 BSA, they seem to be based on cases resembling winchesters .338 win. Mag. Very nice rifles, they have 2 flip up aperture sights as well as 2 flip up express sights. I think I have a line on one now.