20 Rounds of 77gr HPBT Match 5.56x45 Ammo by Winchester

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Fast Facts
  • Manufacturer Winchester
  • Condition New
  • Bullet Weight 77gr
  • Projectile Type HPBT
  • Ammo Use Type Match Shooting, Range Training
  • Casing Type Brass
  • Quantity 20
  • Caliber 5.56x45
  • Manufacturer SKU S556M
  • Primer Type Boxer
  • Muzzle Velocity (ft. per sec) 2750
  • Muzzle Energy (ft. pounds) 1293
  • Magnetic No
  • UPC Barcode 020892220379
  • Description
  • Reviews
  • Q & A
More Details About Our 20 Rounds of 77gr HPBT Match 5.56x45 Ammo by Winchester
The 5.56x45 was hardly designed to put ten bullets through one hole at 1,000 yards. But when Winchester loads a high-quality cartridge with a 77 grain match grade hollow point boat tail, the 5.56 can do some pretty impressive tricks!

This round’s bullet is a hefty fellow. That gives it the momentum it needs to resist getting blown off its intended trajectory by crosswinds, but it does call for a faster 1:7”, 1:8” or 1:9” barrel twist. The HPBT is the bullet of choice for snipers, as its low-drag jacket profile, long boat tail and narrow meplat all contribute to its high 0.346 G1/0.176 G1 ballistic coefficient. A concentric jacket and rearward situated uniform lead core also give the HPBT stellar rotational stability. Just don’t mistake the HPBT for a hunting bullet – that nose cavity does not make the bullet expand if it tunnels through a soft medium. (A bullet like this would cream any varmint’s corn pronto, though.)

Winchester’s finest brass cases, match Boxer primers and clean-burning powder ice their Match series ammo’s cake. Order a box and see just how accurately your favorite rig can really perform!

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