Steyr m-95 with weird chamber...Please help

[DocAV]

Firstly, a Nice engraving job.
Next Chamber dimensions, Bolt head, Bore dimensions...etc

1.The suggestion that the Bolt head has been changed to that of a "M95M" ( Yugo conversion) could be feasible...one must Photograph the "free" Bolt head and compare it to a M95M Bolt head of Known provenance.

2. Chamber casting is a MUST, either Hard Wax or Cerro-metal. Tap out with cleaning rod if necessary.

3. "Bore" the Dimensions of Both the 8x50R and 8x56R barrels are as follows: Bore .315" (8.0mm) Grooves .329-.330". The 8x50R used a .324FMJRN Diameter Bullet, whilst the 8x56R used a .329" diameter FMJBT.
The .324 RNFMJ "upset" its base on firing, filling the grooves ( "Minie effect") and providing a gas seal. The .329FMJBT needs to be full groove diameter, because BTs don't "upset" well, and a .324 BT would suffer "windage". THis was common practice in Round Nosed Cartridge rifles on the 1885-1910 period...the Bullet was actual;ly less in diameter to the Grooves, to reduce jacket friction and metal fouling..." Base Upset Obturation" , initially applied to nearly all Austrian-made Firearms, and also variously applied to other European Rifles using cylindrcal jacketed projectiles. This all changed once Boat-tailed projectiles were introduced.( 1898-1911).

Until all these questions are settled, this is a case of a fine rifle stuffed around by a "bubba's "idea of ammunion supply.

Regards,
DocAV