140gr vs. 147gr ELD-M: Does a 1:8 Twist Stabilize Both?

Yes. A standard 1:8 twist 6.5 Creedmoor stabilizes both the 140gr and the 147gr ELD-M.

Hornady states the 147 ELD-M gets its “best terminal performance” in a 1:7 to 1:8 twist, so a 1:8 barrel is inside the window.

That makes the real question 140 or 147, and the answer depends on how far you shoot and what your rifle likes. Here’s how to pick.

The Short Answer: 140 vs. 147 ELD-M

Pick the 147gr if you shoot long range and want the highest Ballistic Coefficient (BC) you can get in a factory 6.5 Creedmoor match load.
Pick the 140gr if your rifle groups it better, your shots stay inside mid-range distances, or you run a barrel slower than 1:8.
Test both if you can. Your rifle gets the final vote.

Both are Hornady Match loads with ELD-M (Extremely Low Drag Match) bullets, brass cases, and 20 rounds per box. When preparing for high-volume practice or competition, learning how to buy bulk ammo helps you stock up on consistent lot numbers without overspending.

What “1:8 Twist” Means

Twist rate is how far a bullet travels down the barrel to make one full rotation. A 1:8 twist spins the bullet once every 8 inches.

Faster twist (smaller number, like 1:7): more spin.
Slower twist (bigger number, like 1:9 or 1:10): less spin.

The 1:8 twist is the common rate for factory 6.5 Creedmoor rifles. If you’re not sure what yours has, check the barrel stamp or the maker’s spec sheet.

Why Heavier Bullets Need More Spin

Many shooters assume a heavier bullet always flies better. However, a heavy bullet only pays off if your barrel spins it fast enough to keep it point-forward.

Here’s the mechanics, in plain terms:

Same caliber, more weight, longer bullet. The 147 is longer than the 140 because both are .264-inch bullets.
Longer bullets are harder to stabilize. They need more spin to fly nose-first.
Air density matters too. Cold air at low elevation is thicker, so it takes more spin to stabilize the same bullet than warm air at high elevation does.

When a bullet doesn’t get enough spin, it wobbles or tumbles. That kills the BC advantage you paid for.

Signs of an under-stabilized bullet:

Oval or sideways holes in paper (keyholing)
Groups that look fine up close but open up fast at distance
Flyers you can’t blame on wind or the shooter

What Hornady’s Own Data Shows for the 147

Hornady publishes velocity data for the 147gr ELD-M from several 24-inch barrels, including its 147 ELD Match test data:

SAAMI test barrel, 1:8 twist: 2,695 fps
Ruger Precision Rifle, 1:8 twist: 2,685 fps
Remington 700 Custom, 1:8 twist: 2,693 fps
Remington 700 Custom Proof Carbon Fiber, 1:8 twist: 2,796 fps
Thompson Center Icon Custom, 1:7 twist: 2,670 fps

Two things stand out. First, every rifle on the list is a 1:7 or 1:8 twist. Second, velocity varies from rifle to rifle even with the same barrel length and twist. Your chronograph matters more than the box.

Side-by-Side: Bullet Design & Ballistics

Both loads use Hornady Match bullets with ELD-M (Extremely Low Drag Match) projectiles, brass cases, and 20 rounds per box.

140gr ELD-M: Listed muzzle velocity typically around 2,710 fps. Offers a slightly flatter initial trajectory and broader stability margin in varied barrels.
147gr ELD-M: Listed muzzle velocity around 2,695 fps with a higher G1 Ballistic Coefficient (.697). Built to retain speed and resist wind drift at extended ranges.

The listed velocities are close. The difference is in how each bullet holds that speed downrange.

What BC Changes Downrange

Ballistic Coefficient is a number that describes how well a bullet cuts through air. Higher BC means less drag.

Less drag shows up in three ways:

Velocity: the bullet keeps more of its speed as distance grows.
Wind drift: the same crosswind pushes it less.
Drop: it falls less over the same distance, because it gets there sooner.

At short range, the gap between two good match bullets is hard to see on paper. It grows with distance, which is why long-range shooters chase BC.

One catch: BC only counts if the bullet is stable. A high-BC bullet that wobbles behaves like a low-BC bullet. That’s why twist rate and bullet weight have to be chosen together.

When the 147gr Makes Sense

The 147 is built to fight wind and hold velocity at distance. That’s what a higher BC buys you.

Go with the 147 if:

You shoot steel or paper well past mid-range distances.
Wind calls are your biggest source of misses.
Your barrel is 1:8 or faster and your rifle groups it well.

When the 140gr Makes Sense

The 140 is shorter, so it needs a little less spin to stay stable. That gives it more margin in a wider range of rifles.

Go with the 140 if:

Your barrel is slower than 1:8. Test a box before you stock up.
Most of your shooting is at mid-range distances, where the BC gap matters less.
Your rifle simply shoots it tighter. That happens, and it’s a good reason on its own.

How to Choose for Your Rifle

Confirm your twist rate. Check the barrel stamp or spec sheet. Or run a cleaning rod with a tight patch, mark the rod, and measure how far it travels in one full turn.
Shoot both at 100 yards. Fire at least a few groups of each from the same rest, on the same day.
Chronograph both. Use your real velocities in your ballistic app, not the box numbers.
Check at distance. Stretch out to the ranges you actually shoot. Look for groups that open up more than they should.
Pick one and buy enough to stay consistent. Once you have a load, stick with it so your data stays good.

FAQ

Will a 1:8 twist stabilize the 147gr ELD-M?

Yes. Hornady states the 147 ELD-M performs best in a 1:7 to 1:8 twist. Very cold, dense air shrinks your stability margin, so confirm your groups at distance.

Is the 147 ELD-M more accurate than the 140?

Not automatically. The 147 has the higher BC, which helps at long range. Accuracy depends on your rifle, so test both.

Can I shoot the 147gr from a 1:9 twist barrel?

Test before you commit. A slower twist leaves less stability margin for a longer bullet. If you see keyholing or groups opening at distance, switch to the 140.

Is the 140 or 147 ELD-M better for hunting?

Both are match bullets built for precision shooting. If you’re hunting, use a dedicated hunting load built for game (such as a soft point) and check your state’s rules.

Does barrel length change the answer?

It changes your velocity, not the twist math much. Shorter barrels give up speed, so chronograph your rifle and use your own numbers. If you run a short barrel, test both loads before you pick one.

Can I switch between 140 and 147 without re-zeroing?

Plan on re-zeroing. Different bullet weights can hit different spots, and your drop data will change too.

Why is the 140 listed faster than the 147?

It’s lighter, so the same cartridge pushes it a little faster. The listed gap is small: 2,710 fps vs. 2,695 fps.

The Bottom Line

A 1:8 twist handles both bullets. Pick the 147 for long-range wind and BC. Pick the 140 for extra stability margin or if your rifle groups it tighter.

Ready to test both? Explore BC Ammo and test our matching match-grade inventory: