As a free Sunday night safety tip....if you own a Mossberg 500 (or 835) and intend to shoot slugs in it, make sure you are using a slug barrel.
A smooth barel is .775" ID while a slug is .729" in diameter. The possibility exists that the slug, wobbling through the barrel, may warp the barrel or lodge in the barrel.
From the Mossberg website:
Mossberg
Can I fire slugs through my 835® vent rib, Accu-Mag® choke tube barrel? No, 835 field barrels (those with a ventilated rib) are "overbored", the extra inside diameter may cause the projectile to "wobble" producing unreliable accuracy. A projectile may wedge inside the barrel causing an obstruction. Obstructions of any kind can cause damage to the firearm resulting in personal injury. Dedicated smoothbore or fully rifled slug barrels are available for the Model 835®. Other 835® Accu-Mag® Choke Tube notes: Buckshot and steel-shot loads are not recommended for use with an Extra Full Turkey tube installed.
I have no idea if Browning, Remington, etc. do the same....might pay to get a slug barrel anyway.