lastnight someone tried to come in my front door at 3 am...tried to opne it and everything..i decided to go out and get a shotgun for my home...i didnt need a pricey one , i just got a mossberg 500 model...it says it holds 6 shells...my problem is i can only get 3 in it and thats after one has been chambered...the shells iam using are..Remington high velocity 12 gauge...2 3/4 length 1 oz shot 8 shot..but on the actual shell it says 2 3/4" 70mm..then up right on the shell it says.. 3 1/4 -1 - 8...im not use to guns...but if someone can help me here and let me know if my gun is messed up or the size shell im using is the problem,,cause like i said i can only get 3 in it thats countiung one chambered...thanks everyone