I have been looking to do a 8mm. Barrel s are real cheap I picked up 4 mauser barrels for $15.00 for all 4 off ebay. I was thinking the steel g3 mags at $2.00 a piece could be band sawed length wise and welded bak together fairly easy, 2 mags to make one, would have to mod the follwers also. they are straight and have a nice flat area to work with. I looked for some m76 mags a while back and was not suscessful. how ever I was told that there was possabley going to be some imported and to call back in June. Saiga is susposed to be exporting a 30-06 according to what I read 2 months ago. If it is avaliable I doubt I would bother to do a conversion to 8mm. you almost need to reload to get the full benifet of the 8mm factory ammo is on the weak side due to all the old 1899 stuff still out there. I thnk the CUP pressures are about the same as 7.62x 39
I was thinking a 8mm long barrel pistol for hunting. but if I get the 308 conversion working there is a ton other rounds based on the 308 caseing
22-308, 243, 7mm-08 ( a very nice round only 100fps slower than 7 mag) 358-08 1.5"-308 and a bunch of wild cat stuff as well. that would all work with the g3 or m14 mags.