Huntsman Luke,
I would be careful using old paper case cartridges in your mossberg pump. We were shooting Geese in the Newton Stewart area a long time ago, & were in a gun shop one day, when a bloke entered the shop, pulled a mossberg pump out of the gun bag, & began to describe the problem he had with the gun, to the shop owner.
He had being down the fore shore on the morning with the same gun, never had a shot, but when he came to unload, he couldn't. What had happened was, the cartridges had got wet some how, & the extractors couldn't eject the cartridge. Obviously, because the cartridge had swollen with the damp.
You have never seen as many people duck at once as he swung round with the gun belly height, to show the rest of the shop what had happened. The only way to remove it safely, was for the shop owner ( who phoned the police before he did it ) to pull the trigger. Which he did in the river opposite.
I dare bet both your Biakel, & Mossberg are Nitro proofed. Get them checked properly, & stick with modern ones. :thumbs:
Bazooka Joe B)