IMR 8208 XBR 1lb Powder IMR 8208 XBR is an accurate‐metering, super short‐grained extruded rifle powder was designed expressly for match, varmint, and AR sniper cartridges. As a medium burn speed propellant, XBR is ideally suited for cartridges like the 223 Remington/5.56mm, 308 Winchester/7.62mm NATO and the 6mm PPC. 1lb IMR 8208 XBR LR,
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