grand veneur
AH elite
The FMJ solids which they made for the .404 Jeffery from 1973-1993 were also extremely weakly constructed. With very thin steel jackets.
Strangely enough, the FMJ solids which they made for the .375 Holland & Holland Magnum were of stronger construction. But their factory loaded ammunition for the .375 Holland & Holland Magnum was ridiculously overpressure. Rifle bolts would fail to open after just two or three shots.
Perhaps @grand veneur can shed some light on this.
I have never owned a rifle caliber 375 H&H Magnum so that I don't know anything about the FMJ bullets used by RWS and about overpressure with this ammunition.
As far as the FMJ bullets are concerned, RWS certainly has loaded until the end the classic thin-walled bullets for the cartridges 10,75x68 and 404 Jeffery. So also the loading data in her manual. But when it comes to the FMJ bullets caliber 9,3mm, I noticed that they had a much thicker wall. The same will be the case for the FMJ bullets caliber .375 used for the cartridge 375 H&H Magnum. However, RWS currently does not have any bigger cartridges with FMJ bullets in its range.
RWS 9,3mm FMJ bullet 18,5g/286gr