303 Brit wants a very long bullet because of it throat dimensions
The Hornady 100 gr handgun bullets fit the dimensions but are too short
The 115 gr cast handgun bullets are longer and would work better in an SKS, .312 or .313 diam.
I have know people to load these for the SKS with success but I think it is more cost effective
to buy the correct bullet, but lately that may be hard to do