Expensive miss.

[bobm]

I found this Hornady .338 cal. 300 gr. A-TIP bullet on the one mile impact berm today. Just sitting in fine soil in remarkable condition. About two feet left of the big steel target sheet. What twist rate would that be?

 

[ronsatspokane]

That's a tight twist.

 

[Fast14riot]

9 or 10 twist will stabilize that bullet, but some run an 8 twist.

 

[GotRDid]

An interesting article about the potential host it may have been fired in…

An Honest Look at 8.6 Blackout | The Ballistic Assistant

www.theballisticassistant.com

 

[FeMan]

An interesting article about the potential host it may have been fired in…

An Honest Look at 8.6 Blackout | The Ballistic Assistant

www.theballisticassistant.com

It sure looks like its about a 1:3. I'll bet you are right.

 

[Syncrowave]

What twist rate would that be?

Shouldn't be hard to estimate/ballpark. Looks like it's doing about ¼ revolution in the length of the engraved section so if you multiply the length of the engraved section (parallel to centerline) x 4, that should be the rate.
If dia is .338" then I'd estimate engraved section ≈ .676" ... multiply that x 4 = 2.7" ... I bet it's 1 turn in 3".

Never heard of a twist that fast. I'm surprised it doesn't yaw to the point of keyholing.

 

[bobm]

I am calling BS that was fired from a mile away if 8.6 Blackout. Easy to drive down range for a pot shot.

 

[joshb]

I don’t know. The bullet looks undamaged from a hard impact. It looks like it dropped out of the sky.

 

[shoot4fun]

A friend of mine had a bullet he recovered off the shore of Lake Erie at Camp Perry.
It was discolored but otherwise perfect (except for the rifling marks).
At a mile the 338 bullet is likely slow enough to not damage .

 

[jpjulian]

I am calling BS that was fired from a mile away if 8.6 Blackout. Easy to drive down range for a pot shot.

Are you thinking an 8.6 BO would not have the range for a 1 mile shot? Before I retired from the State Police I was one of the RO/Instrutor's. Another RO did something stupid with a G22 firing our duty .40 S&W 180 grain subsonic ammo. He launched a few rounds over the berm. The round fully penetrated an exterior wall at a sanitary district office and hit the office manager's desk 7/10 mile down range. This is no BS and the fallout got our range closed for more than a year until changes were made to the berm and baffles. It's entirely possible the .338 round shown could travel a mile.

 

[bobm]

I had my doubts, yes. Given the few types of AR style rifles available all with 3" twist. With no factory loaded ammo using this bullet, it was no doubt hand loaded. Load data shows speeds in the 1050 fps. range for a 300 gr. bullet. Can the drop at a mile be calculated? Remaining speed and energy?

At what angle was the barrel elevated for this bullet to reach and by pure luck hit the 10ft. x 30ft. wide berm? It shows no evidence of ground skip impact. Why would someone with knowledge of this rounds intended purpose attempt a hail Mary shot at a mile?