No Turn 30 BR REAMERS?

[Pete Wass]

Someone or plural must have no turn 30 BR reamers? I am wondering what size necks you decided on?

Thanks,

Pete

 

[P1ZombieKiller]

if it were me, i would not go with smaller than .333", however, with 30br, I would always skim turn it.
Probably to .0116" or so. That lip on the base of the neck will be much thicker than that if not turned off.

 

[Bill Norris]

if it were me, i would not go with smaller than .333", however, with 30br, I would always skim turn it.
Probably to .0116" or so. That lip on the base of the neck will be much thicker than that if not turned off.

Agree that portion of the neck will pose issues most likely if not turned down.

 

[P1ZombieKiller]

if it were me, i would not go with smaller than .333", however, with 30br, I would always skim turn it.
Probably to .0116" or so. That lip on the base of the neck will be much thicker than that if not turned off.

The quote should say "that lip at the base of the neck will be much thicker than the .333" chamber if not turned down".
You probably wont even be able to chamber a loaded round if you didn't turn it down.

 

[AlNyhus]

The 'lump' will measure right at .335-.337 when manually expanded. If you don't turn it off, the chamber neck will need to be at least that diameter for a case to chamber...plus the neck clearance you want.

You could get around that with a delumping die and then spec the reamer neck dimension accordingly. Or blow them out in a f-form barrel and go from there.

Good shootin' -Al

 

[Pete Wass]

I fie formed one yesterday using a 6mm bullet. There is a distinct lump but the one on this case only measures a half thou bigger than the rest of the neck. I realized that would need to be eliminated. I don't mind haveing to ligthly turn necks. But alas there is always something to be done!

I wonder why Alpha doesn't make 30 BR cases??? That would be the cat's rectum.

 

[Pete Wass]

After mulling this over a bit, I wonder why chambers continue to be cut so small? I had a new reamer ground last winter, a real Robinette. Wish I had thought this through before I ordered the reamer

 

[P1ZombieKiller]

@BartsBullets has actually gone to all no turn chambers on his 6's (I believe).

Not 100% convinced that a 30br can be truly no turn when someone starts with 6br brass.

If anyone was to make factory 30br, it would probably be Alpha.

For now, it am very happy with my Lapua 6br to 30br conversion process.

 

[jackieschmidt]

F@Z

Someone or plural must have no turn 30 BR reamers? I am wondering what size necks you decided on?

Thanks,

Pete

Pete,I have never seen a no turn 30BR.

I think the consensus is that just too much metal is being moved, or displaced, to achieve consistent necks without turning.

I agree that it would be great if Alpha, or even Lapua, brought out a “factory” 30BR case. That is, as long as they patterned it after what the vast majority of 30 BR shooters use, a necked up 6BR Lapua case.

They certainly did it right with their 6PPC. Perhaps they will follow suite with what is arguably the second most popular Short Range Chambering.

 

[skeetlee]

Pete
I’ve been considering a no turn 30 myself. Like already discussed not sure it’s the right move. I did just chamber a .274 6ppc and it’s shaping up to be the best 6ppc barrel I’ve ever owned. Just how much of that is the barrel and how much the chambering. I’m guessing I got a really good barrel. Shoots like crazy though.
Alpha and Lapua brass both. The Alpha needs the .274 and the Lapua would be ok with .273. .003 clearance.
Lee

 

[Pete Wass]

One of our lads has a Hudro forming die and says there is a very small outside doughnut left. I shot one open the other day and it left a .0005" doughnut. At the price of bullets, I wonder at the logic of shooting them open though. I don't have hundreds of sucky 6 mm bullets on hand at the moment.

I think I would go for a .334" if I have one ground . Give it a
bit more breathing room.

good point about the factory made 30 BR cases though. It ain't as if there aren't any out there

 

[Pete Wass]

Pete
I’ve been considering a no turn 30 myself. Like already discussed not sure it’s the right move. I did just chamber a .274 6ppc and it’s shaping up to be the best 6ppc barrel I’ve ever owned. Just how much of that is the barrel and how much the chambering. I’m guessing I got a really good barrel. Shoots like crazy though.
Alpha and Lapua brass both. The Alpha needs the .274 and the Lapua would be ok with .273. .003 clearance.
Lee

Does the alpha brass leave a doughnut?

 

[Pete Wass]

I had a new Robinette reamer made over the winter with a .331" neck. I had no idea of a not turn when I ordered it . Can't put the metal back however, eh?

 

[P1ZombieKiller]

I had a new Robinette reamer made over the winter with a .331" neck. I had no idea of a not turn when I ordered it . Can't put the metal back however, eh?

i really don't believe there can ever be a 30br with a true "no turn neck" if you start with 6br brass.
If someone was to make factory 30br brass, then I think you have a shot.

When you take the neck up .060", the shoulder has no choice but to become part of the neck.

therefore you will have excess brass there that must be turned off.

 

[AlNyhus]

i really don't believe there can ever be a 30br with a true "no turn neck" if you start with 6br brass.
If someone was to make factory 30br brass, then I think you have a shot.

When you take the neck up .060", the shoulder has no choice but to become part of the neck.

therefore you will have excess brass there that must be turned off.

This ^^^^^^^^^^