High Brass?

[UrbanWolf]

Ok, that helped. Now i know it's the ammo.

I've been noticing my Mossberg 500 jamming on those "high brass" ammo, while my Remington 870 never had a jam. But I just like the way Mossberg 500 feels way better, plus the military uses it.
Is it just me or there is something about Mossberg 500s and high brass?

[Blowby]

Ok, that helped. Now i know it's the ammo.

I've been noticing my Mossberg 500 jamming on those "high brass" ammo, while my Remington 870 never had a jam. But I just like the way Mossberg 500 feels way better, plus the military uses it.
Is it just me or there is something about Mossberg 500s and high brass?

Take a picture of the chamber entrance of your barrel.

Like this