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-20s 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.