.510 whisper, is it a bottleneck?

[HSNARC]

What makes a case a “bottleneck”?

Does an external shoulder make it?

The whisper seems to have a powder column equal in diameter to the diameter of the bullet but uses a cut shoulder on the outside for head space.

In my reckoning the .510 would be a “straight walled” case would it not?

 

[Dogtown]

Hey, I can tell you all about .510 Whisper.

It's pretty gimmicky, but fun from time to time, especially if you use tracers. Its got a minimal shoulder cut into it for headspace, but otherwise it's straight walled. There's a step after cutting the .338LM brass down where you need to remove the taper. Checkout what a pain it is to make brass from my experience:

 

[spife7980]

Straight or shouldered?

 

[HSNARC]

I’m looking at it as a loophole for deer hunting in my state that allows “straight walled cartridges” of any length in “pistols” no bottlenecks over 1.4”

 

[cas6969]

My next question would be what kind of pistol? There's other ways to skin a cat and other "easy" to obtain 50 cases. Unless you're chasing a .50, there's probably better loopholes... again depending on the "pistol" as you put it.

 

[HSNARC]

Very true. A 45-70 in a Thompson Center with an adapter for a brace would probably do the most cat skinning.

This is a thought exercise I go through every spring mainly because my state is retarded and there is nothing I can do about it.

 

[Dogtown]

FWIW, with a 650 gr pulled Ball bullet going subsonic, the .510 Whisper hits as hard as a full power 175gr .308WIN at 100m.

 

[cas6969]

I can't do AR pistols in my state, but I thought about getting a singe shot lower and a .50 Beowulf short barrel upper with "brace" to play that game. Non semi auto, it would be legal. (no real reason, just to do it. Never did, too many better projects to waste money on)

A .45-70 Contender with brace wouldn't be fun on your shoulder I don't think, though people do shoot shockwaves that way. (I'm a long time .45-70 Contender pistol shooter)
.460, 500 S&W in an Encore would also do the same and hurt just as much. lol

If semi auto works, a .350 Legend AR pistol would probably be the easiest, cheapest, best bet (since you're not actually interested in handgun hunting. )

 

[Boomtech]

Hey, I can tell you all about .510 Whisper.

It's pretty gimmicky, but fun from time to time, especially if you use tracers. Its got a minimal shoulder cut into it for headspace, but otherwise it's straight walled. There's a step after cutting the .338LM brass down where you need to remove the taper. Checkout what a pain it is to make brass from my experience:

So what angle cutter do you use for cutting the shoulder. I'm working on making some dummy rounds for my Smith to use when chambering my barrel. Thanks in advance.

 

[Dogtown]

I was using a K&M neck turner. It took some trial and error to figure out what was the correct amount to remove.

 

[Boomtech]

I was using a K&M neck turner. It took some trial and error to figure out what was the correct amount to remove.

So that would be with the Large Caliber 50 degree cutter. Do you mind sending me the dimensional specs you use on your brass?

 

[Dogtown]

Yeah, it's using a .500 Linebaugh(?) pilot on the cutter, I think.

OD below shoulder

OD above shoulder

Length of neck

Trying to do this while holding my phone means these aren't 100% exact, but should at least get you in the ballpark.

 

[Boomtech]

Yeah, it's using a .500 Linebaugh(?) pilot on the cutter, I think.

View attachment 7942351
OD below shoulder

View attachment 7942352
OD above shoulder

View attachment 7942353
Length of neck

Trying to do this while holding my phone means these aren't 100% exact, but should at least get you in the ballpark.

Thats perfect, Thank you for doing that

 

[mjbaker22]

I’m looking at it as a loophole for deer hunting in my state that allows “straight walled cartridges” of any length in “pistols” no bottlenecks over 1.4”

I’m considering trimming 30BR down to 1.4” to do something similar.

 

[KnowNothing256]

Any reason not to just headspace off the case mouth and skip the trimming?

If you’re getting a custom chamber, you could get dies to match.

 

[45-90]

Any reason not to just headspace off the case mouth and skip the trimming?

If you’re getting a custom chamber, you could get dies to match.

If you order a special chamber reamer you could chamber off the case mouth...but that's not the 510 whisper. You can make it any way ya want if ya send in for a special chamber reamer grind.
I use the standard 510 Whisper reamer, so I trim in mill and turn in lathe, easy that way. It has about 90 grains of capacity in case ya want to go super sonic it gets over 5000 ft/lbs of muzzle energy with the lighter 350 to 500 gr bullets. And AR 10 capable mag fed with these "lighter" bullets...but ya have to turn new extractor groove. Picture of 510 whisper 350 gr cutting edge for AR 10 or 750 Amax for magnum bolt gun. It's all easy with a lathe and milling machine...but that's like cheating compared to hand tools.