I've got a mossberg 500 with an 18" barrel. I've been buying up a lot of 00 buckshot from ammunitiontogo.com. They've sold out of the stuff I've been buying for the past couple of months (big surprise) I want a little variety though. They have a good deal on Federal LE Tactical Low Recoil Rifled slugs. I'd like to start buying up this stuff for my gun. Will I run into any trouble? The gun did not come with any chokes and there is not one installed on there now. I'm a little lost, and I was looking for some opinions. Any help from you guys would be great.