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Ergonomic shape
completely and reliably ignite the powder charge
Assembled in ribbed copper cups just like the originals
Advanced air flow design keeps quiet
3/8" Rings
117gr Hornady Superformance 257 Roberts +P 17 HMR Ergonomic shape257 Roberts +P 117 gr SST Superformance *NOW SHIPPING AMMUNITION CALL FOR QUOTE* Item #81353 20 Box US Patent: 8,161,885 8,413,587 Increase your rifle's performance up to 200 fps without extra chamber pressure, recoil, muzzle blast, temperature sensitivity, fouling, or loss of accuracy. Superformance uses progressive propellants that take your favorite V MAX, NTX, SST, GMX, and InterLock, bullets to levels of performance that are simply unattainable
