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December 14th, 2022

Could You Shoot 0.8 MOA at 300m — for FIVE HUNDRED Shots?

Sierra Bullets 500 round tunnel test

For load development, some guys shoot 3-shot groups. Other guys shoot 5-shot groups, or even 10-shot strings. But for testing its projectiles, Sierra Bullets takes it to another level entirely. A while back Sierra was testing its .30-Caliber 175gr HPBT MatchKing in the Sierra underground tunnel. The results appear above — a FIVE HUNDRED Round group!

500 Shots Form 0.82 MOA Group at 300m (328 yards)
Sierra’s trigger-pullers sent five full boxes of bullets down-range at a single target. The photo above shows the result of 500 shots taken in a 300 meter test tunnel. The raw group size, edge to edge of the farthest shots, is about 3.13 inches, as shown on the calipers’ metal linear scale. Subtract a .308″ nominal bullet diameter* to get the 2.823″ on the digital readout. So you’re seeing a 2.823″ group at 300 meters (328 yards). One MOA at this distance is 3.435″ so this 500-round group is 2.823 divided by 3.435 or 0.82 MOA (0.8218 MOA to be precise).

This 500-round group was shoot as part of a pressure/velocity test for a commercial customer. The cartridge was .308 Winchester, loaded at 2.800″. The powder was Reloder 15. A 26″ barrel was shot from a return to battery rest. The gun was cleaned every 125 rounds and two foulers shot.

What do you think — could you beat this group from a bench for 500 rounds?

One Facebook poster joked: “500-round group? Everyone knows anything less than 1000-round groups are a waste of time and statistically irrelevant.”

Test Tunnel Sierra

Sierra Bullets Test Tunnel Barrels

Sierra’s 300 Meter Testing Tunnel
Ever wonder how (and where) Sierra tests its bullets? The answer is underground, in a 300-meter test tunnel located under Sierra’s factory in Sedalia, Missouri. The photo above shows the construction of the tunnel back in May, 1990. Like most bullet manufacturers, Sierra does live-fire bullet testing of its projectiles. Sierra’s 300-meter test range is the longest, manufacturer-owned underground bullet test facility in the world. In years past, Sierra offered free visits to the test tunnel as part of a factory tour.

* Normally, to get an exact group size, you should subtract the TRUE bullet hole size, which is usually smaller than the nominal bullet diameter. E.g. a .308 bullet hole may show on paper as .298 or so. But here, for simplicity, we are subtracting .308″ because we do not have the original target to measure.

Permalink Bullets, Brass, Ammo, Competition, Tech Tip No Comments »
December 14th, 2022

Create Your Own Shooting Targets with FREE Online Program

Custom AccurateShooter Bullseye target Printtargets.com
We created this custom target in 5 minutes using PrintTargets.net. If you like it, DOWNLOAD HERE.

AccurateShooter.com has a HUGE collection of FREE downloadable PDF targets. We offer a very wide range of target designs: Load Development Grids, NRA Bullseye targets, Official-Size BR targets, Realistic Varmint Targets, Silhouette Shapes, Fun Plinking Targets, and even specialized tactical training targets. If our collection of free targets isn’t enough, or if you want to create a new kind of target — you’re in luck. The Australian-based interactive website, PrintTargets.net, allows you to create your own customized, printable PDF targets. Shown below are just a few of the target designs you can create in minutes:

CLICK Graphic to Create Your Own Targets.
Free downloadable targets

Just follow the step-by-step instructions to set paper size, layout, bullseye color, line thickness, number of rings and diameter. You can even add Score Numbers to your target rings. PrintTargets.net is easy and fun to use. It’s much faster to create targets this way than to try to draw a series of circles with PowerPoint or MS Paint.

CLICK HERE to Design Your Own Downloadable Targets

Power-User Tip: PrintTargets.net even offers a handy diamond-grid calibration diagram that you can add to your custom target designs. You’ll find the calibration grid as option #15 when you design your target — just scroll all the way down the PrintTargets.com home page.

Free downloadable targets target maker online software

Free downloadable targets

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