If it is a Mossberg 835, then no. This gun is overbored and Mossberg cautions against shooting slugs through overbored barrels.

This is from the F.A.Q. section of www.mossberg.com ==>

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.

The Mouse