I had a couple of slabs of Blue diamond and liked them a lot at first, but about half way into the first slab I was having difficulty opening the gun.
At first I thought something was wrong with the action, so I ejected and closed and opened the gun a couple of times and all was good.
Nit satisfied with this, I removed the barrels for a quick inspection, but count see anything wrong.
I remounted the barrels, loaded a couple more cartridges and upon ejecting has the same resistance to opening.
I repeated my inspection and on the next pair, again with the resistance. That’s when I realised it was the cartridges.
I emailed Gamebore and was told (I’m paraphrasing) that due to the Gordon recoil system having an absence of ‘brass’ across the face of the cartridge, the ‘brass expands. If the batch is close to its maximum tollerance dimension, or the gun breach is maybe a touch in the small said, or worse, a combination of the two, then the cartridges are known to be difficult to eject.
To be fair to Gamebore, they offered to take back the cartridges, but as I was quickly down to half a slab, I just put up with it until they ran out.