cediboy wrote:Yes, i am talking about one of the 8x57mm feed-trays for the MG42 that were converted with a "spacer" at the front to keep 7.62x51mm cartridges to the rear of the feed-tray.
You say that you checked the top-cover cartridge-depressor (feed-ramp-angle) and that it was good. I believe that the 8x57mm uses a different gauge/different angle than 7.62x51mm due to shorter cartridge-length of the 7.62x51mm (?).....or is your SA42 only set up with 7.62x51mm Parts (?).
On the challanges of firing .308 plastic-blanks.........with the non-locking bolt that you are using.....it sounds like you still need to use a smaller BFA Hole-Size. As this information was about .148"..........I would "guess" that you should try something closer to .135"...or even down to .125". and see how it works.
The best way is to use a 2-pcs. Blank-Adapted Barrel-Assm. with a locked bolt......this allows the blank to build up pressure and not a slower/unlocked push.
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