Others Why My PCP Shoots Flat‑Nose Slugs Better (And Yours Might Too)

[Grunt64]

Most of us grew up thinking a slug should look like a jet or a missile — long, tapered nose, sharp point, “cutting through the air.” That makes sense for firearms and rockets, but PCPs live in a completely different world. Once I started testing slugs in my .357 and .308 Texan, the results were clear:


“Flat Nose Slugs Shoot Better in PCPs — Here’s Why”

Post: Most shooters assume a pointy, tapered slug should fly better — like a jet or a bullet. But at airgun speeds, the physics flip. After testing in my .357 and .308 Texan, flat‑nose slugs consistently shoot tighter groups and give fewer flyers. Here’s the short version of why:

• Pointy noses need supersonic speed. At 800–1000 fps, long ogives (the shape of the nose) don’t stabilize well. They yaw and wobble.
• Flat noses stabilize better. They move the center of pressure back toward the center of mass, which keeps the slug flying straight.
• Better bore seal. A flat meplat engraves the rifling more consistently, giving lower ES/SD and cleaner launches.
• BC at subsonic speeds comes from stability, not pointy shapes. Weight, length, and uniformity matter more than nose taper.
• Real‑world results. In both my .357 AEA and .308 Texan, flat‑nose slugs group tighter, drift less, and produce fewer unexplained flyers.

Bottom line: Your brain says pointy should fly better — but subsonic airgun ballistics say flat nose wins.
“Only a tiny handful of extreme‑mod PCPs ever touch 1,300 fps, and even that’s still below the speed where long, pointy ogives start to behave the way firearm bullets do. We’re using supersonic shapes in a subsonic world — no wonder flat‑nose slugs keep outshooting them.”

 

[hameditor]

VERY interesting! Thanks for posting

 

[Grunt64]

VERY interesting! Thanks for posting

Your Welcomed and I pray for all members to have a VERY MERRY CHRISTMAS.

 

[Chief55]

I have always liked flat nose slugs because they transfer a lot of energy, but they are hard to find in the small calibers. Everything is pointed hollow points. I do have a very nice mold for them in .30 caliber. Merry Christmas Grunt.

 

[Grunt64]

I have always liked flat nose slugs because they transfer a lot of energy, but they are hard to find in the small calibers. Everything is pointed hollow points. I do have a very nice mold for them in .30 caliber. Merry Christmas Grunt.

The first time I shot flat nose I was dumb founded but, after learning the why it all made sense. Merry Christmas Chief55:

 

[MMCM13]

What are we calling flat nose? Are we talking Wadcutters or more like truncated cone slugs?

 

[Grunt64]

What are we calling flat nose? Are we talking Wadcutters or more like truncated cone slugs?

We’re talking about truncated‑cone / flat‑meplat hunting slugs — exactly like the Hunter’s Supply .357s below.

 

[Chief55]

Yes, accurate and they hit like a ton of bricks.

 

[Madhatter]

Not only slugs but pellets also. Bob Sterns did a bunch of testing and found the metaplat on the cast pellets actually worked better than the round nose factory pellets.

If you want to be amazed or just get a headache trying to figure things out read this.

Changing My Thinking About Slugs - Airguns & Guns Forum

Changing My Thinking About Slugs, Air guns, Airgun Forum

www.gatewaytoairguns.org

 

[Billm]

We’re talking about truncated‑cone / flat‑meplat hunting slugs — exactly like the Hunter’s Supply .357s below.

On the slugs pictured, the meplat should not engage the rifling. Unless it’s a cylindrical slug (full wadcutter” I don’t see how the meplat would be in contact with the rifling. Am I misunderstanding your post above? I can’t picture how the nose on that slug would help with bore seal?

 

[Grunt64]

On the slugs pictured, the meplat should not engage the rifling. Unless it’s a cylindrical slug (full wadcutter” I don’t see how the meplat would be in contact with the rifling. Am I misunderstanding your post above? I can’t picture how the nose on that slug would help with bore seal?

The meplat on these Hunter’s Supply slugs never touches the rifling — only the bearing surface does.
When I said the flat nose helps with bore seal, I meant indirectly: at subsonic PCP speeds a flat meplat
reduces initial yaw and keeps the slug centered as it accelerates. That keeps the base square in the bore,
which improves the actual seal. It’s not the nose sealing the bore — it’s the nose helping the slug fly straighter.

 

[Grunt64]

Not only slugs but pellets also. Bob Sterns did a bunch of testing and found the metaplat on the cast pellets actually worked better than the round nose factory pellets.

If you want to be amazed or just get a headache trying to figure things out read this.

Changing My Thinking About Slugs - Airguns & Guns Forum

Changing My Thinking About Slugs, Air guns, Airgun Forum

www.gatewaytoairguns.org

Thanks for pointing me to Bob’s write‑up — I appreciate that.
It actually lines up with what I’ve been seeing in my testing. A year ago, I was testing some round nose, and I was surprised of the outcome.

 

[FL22]

My Taipan Veteran 2 700mm shoots the .25 JTS Semi Domed 29.32gr better than any other pellet I’ve tried. I was having one of those “awe what the hell moments” making a pellet order.

I have no idea if the projectile having a round or flat nose makes a hill of beans, just glad that I finally found something that my Taipan likes as I was starting to become frustrated.

 

[Solo1]

My Taipan Veteran 2 700mm shoots the .25 JTS Semi Domed 29.32gr better than any other pellet I’ve tried. I was having one of those “awe what the hell moments” making a pellet order.

I have no idea if the projectile having a round or flat nose makes a hill of beans, just glad that I finally found something that my Taipan likes as I was starting to become frustrated.

Try some slugs in it mine loves them!

 

[FL22]

Try some slugs in it mine loves them!

Are you still shooting the NSA 34.9gr ?

 

[Solo1]

Are you still shooting the NSA 34.9gr ?

Yes sir

 

[FL22]

@Solo1 on my order from PA I’ll try them out, thanks.

 

[Grunt64]

My Taipan Veteran 2 700mm shoots the .25 JTS Semi Domed 29.32gr better than any other pellet I’ve tried. I was having one of those “awe what the hell moments” making a pellet order.

I have no idea if the projectile having a round or flat nose makes a hill of beans, just glad that I finally found something that my Taipan likes as I was starting to become frustrated.

Glad you found a pellet your Taipan likes — those rifles can be surprisingly picky until something finally clicks.

For what it’s worth, I wasn’t saying nose shape is the only factor. Just that in some platforms — especially higher‑powered PCPs and slug setups — the nose profile can absolutely influence how the projectile behaves in the bore and in flight.

Pellets are a different animal since they’re drag‑stabilized, so they tend to care more about head/skirt consistency than nose shape. Slugs are where the nose profile starts to matter a lot more.”**

 

[FL22]

Pellets are a different animal since they’re drag‑stabilized

Ballistic Theory Correcting What You Have Been Told About Pellet Aerodynamic Stability

Feb 2, 2024

I have previously tried to explain the different types of stability used by pellets. Here I hope to be able to debunk a very common myth on pellet aerodynamic stability, and that is the myth that pellets are drag stabilized.

In a video by one of the leading air rifle video producers, he went to great lengths to explain pellet aerodynamic stability and how it differs from slugs. Unfortunately, he just repeated everything else which has been said before. Fig 1 below is close to one of his main diagrams and is typical of many diagrams used to explain drag stability on pellets.

...

• Miles_M
• Replies: 3
• Forum: Airgun Modding And Theory

• 

 

[Grunt64]

Ballistic Theory Correcting What You Have Been Told About Pellet Aerodynamic Stability

Feb 2, 2024

I have previously tried to explain the different types of stability used by pellets. Here I hope to be able to debunk a very common myth on pellet aerodynamic stability, and that is the myth that pellets are drag stabilized.

In a video by one of the leading air rifle video producers, he went to great lengths to explain pellet aerodynamic stability and how it differs from slugs. Unfortunately, he just repeated everything else which has been said before. Fig 1 below is close to one of his main diagrams and is typical of many diagrams used to explain drag stability on pellets.

...

• Miles_M
• Replies: 3
• Forum: Airgun Modding And Theory

• 

“Miles, you’re right that pellets aren’t purely drag‑stabilized — that explanation gets repeated too often.But they’re not purely spin‑stabilized either.Pellets use a hybrid system: gyroscopic stability from the rifling, and aerodynamic stability from the deep skirt and rear‑biased center of pressure.That’s why pellets tolerate slower twist rates and still fly straight, while slugs need much more spin to stay stable.” “My .357 testing showed the same thing — the flat‑nose slugs with better bore seal and more rear drag went to sleep faster than the tapered ones.Subsonic flow behaves differently than firearm speeds, and the nose shape + pressure distribution matter a lot.”