The plastic ones for handguns/rifles are pretty easy to break. The aluminum ones by A-Zoom are much sturdier. The anodizing coating is aircraft-grade and will last. Eventually, with much hard use or several year's age, the polymer cushion in the primer area will harden; replace at that point with new caps.thanks everyone. I was looking at the plastic one's on MidwayUSA and wasn't sure if they were any good. They have some aluminum ones also.
I think Bass Pro has a bunch in different calibers. If you're in a bind you can get them out at GunWorld.
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