MTM CASE-GARD J-20 series ammunition cases are a favorite of rifle enthusiasts throughout the world. Made of virtually indestructible polypropylene that will not warp crack chip peel expand or contract. The CASE-GARD J-20�s are available in five sizes. All rounds are listed bullet up position. Some reloaders don't like the lid touching there bullets so the lid dimension below is for them. There are a lot of reloaders that expand the case as much as half inch and claim no problems with accuracy.