Thanks guys! Thought with all this great help and advice I've received I would give you all, a WELL DESERVED update! I spoke with the seller today and confirmed definitely...
1. It -is- a broken screw [not a tap!!!!!] from a Redfield one piece scope base, which he is including with the rifle [so I am short the rear screw that is broken off]
2. The seller said a 30/06 cartridge fed and chambered easily from the magazine and the projectile fit(?)the muzzle end of the bore tight. I ROUGHLY FIGURE BY PROCESS OF ELIMINATION,that eliminates the following cartridges:
6.5 ARISAKA/6.5 CARCANO/6.5x55mm/7x57mm/7.65 ARG/8x57mm/9x57mm/ and 303 BRITISH. However the 25/06/.270/.280/30/06 ACKLEY IMP.FAMILY OF CARTRIDGES IS A SLIGHT POSIBILITY AND WORRISOME. I believe Der Ami's fire forming method might be a GOOD quick initial check, to start with.
3. As to the gun, it was built by an unknown gunsmith[for now] for a gent in the Tyler Texas Area in 1941 out of a stick of wood. The stock is not a Fajen or Bishop, if you look under magnification at the front of the cheekpiece you can see a downward curl on the FRONT bottom line of it, while the comb above is very open. I now realize I had a gun with a cheekpiece identical to this, a 1903 Springfield made by Bill Sukalle when he was in Phoenix Arizona during the war. the front fitting is ebony as is the gripcap, so was my 03. The seller said no screws are buggered and the only stock problems are a little finish scratches on the cheekpiece, in the finish. The seller knows the owners family and was told a Niedner Buttplate with widow's peak was replaced with a recoil pad in the late 50's [Curses!!!!] THE RECEIVER RING HAS NO ARMORY MARKINGS [smooth], SO IT MAY BE A COMMERCIAL MAUSER ACTION [perhaps Steyr?] He said the trigger was excellent and the checkering quality excellent, as is the wood to metal fit. The bottom of the bolt is checkered with a swiss file. Bore... hardly shot! SELLER HAS NOT HAD ACTION OUT OF STOCK SO THERE MAY BE A CALIBER MARKING UNDER WOOD! That's all for now,I'll report more later or when I get it!!! THANKS TO ALL Jerry

JERRY