No Turn 30 BR REAMERS?
- Thread starter Pete Wass
- Start date
P1ZombieKiller
Silver $$ Contributor
if it were me, i would not go with smaller than .333", however, with 30br, I would always skim turn it.
Probably to .0116" or so. That lip on the base of the neck will be much thicker than that if not turned off.
Probably to .0116" or so. That lip on the base of the neck will be much thicker than that if not turned off.
Agree that portion of the neck will pose issues most likely if not turned down.
P1ZombieKiller
Silver $$ Contributor
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
Silver $$ Contributor
The 'lump' will measure right at .335-.337 when manually expanded. If you don't turn it off, the chamber neck will need to be at least that diameter for a case to chamber...plus the neck clearance you want.
You could get around that with a delumping die and then spec the reamer neck dimension accordingly. Or blow them out in a f-form barrel and go from there.
Good shootin' -Al
You could get around that with a delumping die and then spec the reamer neck dimension accordingly. Or blow them out in a f-form barrel and go from there.
Good shootin' -Al
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Pete Wass
Gold $$ Contributor
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.
I wonder why Alpha doesn't make 30 BR cases??? That would be the cat's rectum.
P1ZombieKiller
Silver $$ Contributor
@BartsBullets has actually gone to all no turn chambers on his 6's (I believe).
Not 100% convinced that a 30br can be truly no turn when someone starts with 6br brass.
If anyone was to make factory 30br, it would probably be Alpha.
For now, it am very happy with my Lapua 6br to 30br conversion process.
Not 100% convinced that a 30br can be truly no turn when someone starts with 6br brass.
If anyone was to make factory 30br, it would probably be Alpha.
For now, it am very happy with my Lapua 6br to 30br conversion process.
jackieschmidt
Gold $$ Contributor
F@Z
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.
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.
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
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
Gold $$ Contributor
One of our lads has a Hudro forming die and says there is a very small outside doughnut left. I shot one open the other day and it left a .0005" doughnut. At the price of bullets, I wonder at the logic of shooting them open though. I don't have hundreds of sucky 6 mm bullets on hand at the moment.
I think I would go for a .334" if I have one ground . Give it a
bit more breathing room.
good point about the factory made 30 BR cases though. It ain't as if there aren't any out there
I think I would go for a .334" if I have one ground . Give it a
bit more breathing room.
good point about the factory made 30 BR cases though. It ain't as if there aren't any out there
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Pete Wass
Gold $$ Contributor
Does the alpha brass leave a doughnut?
P1ZombieKiller
Silver $$ Contributor
i really don't believe there can ever be a 30br with a true "no turn neck" if you start with 6br brass.I had a new Robinette reamer made over the winter with a .331" neck. I had no idea of a not turn when I ordered it. Can't put the metal back however, eh?
If someone was to make factory 30br brass, then I think you have a shot.
When you take the neck up .060", the shoulder has no choice but to become part of the neck.
therefore you will have excess brass there that must be turned off.
AlNyhus
Silver $$ Contributor
This ^^^^^^^^^^
wildcatter
Silver $$ Contributor
I just chambered a 1-17 Lilja with a .333"
Nk Robinet reamer. I am shooting Randy's 112 grain bullets in it.
Today was day 1, I started by trimming new Lapua 6BR Norma brass to 1.520", i then loaded 12 grains of Bullseye in them with a Remington, 7.5 SRP. Then i filled the cases with Italian bread crumbs, and seal them with bar soap, paraffin, or bees wax.
This makes for very uniform fired cases, after a final trim length of .1505" for their finished length, they are ready to load. Yes they have a donut, but for my aplication, even on a zero freebore chamber, I will never come close to seating a bullet deep enough to contact the thicker neck material. I don't see a need to worry about the dognut?
I loaded the 20 cases with 34.8 grains of N130 ans same 7.5 Remington primers. Sized with Br Body die for .002" shoulder bump. Then I use my Wilson Br bushing die to size the neck @ .326" and set my seating die for a hard jammed bullet. I did this by starting a bullet, then chambering it. That seated the bullet about .020" deeper in the case, which was what I used to adjust my seating die for that depth.
This was with 20 cases. Zero"d using the load above with 5 cartridges then shot 5 for group, the next 5 I seated the bullets .010 deeper. The shot abot .2". The last 5 cases were sized with a .325" bushing and back out to the full jam length the first 5 were shot at. Didn't like either neck tention with the bullets crammed that hard into the lands.
The .010" deaper seated load was pbviously more well liked.
But after reading this, I don't understand the reasoning, that the dognut would afect anything. If it were a 10 twist, or I was seating 130 or 150 grain bullets. I could see the dongut causing concern. But with a 112 115 or 118 bullet, I don't see a need to worry about it? Am I overlooking something?
To me, i have a no turn chamber.
Nk Robinet reamer. I am shooting Randy's 112 grain bullets in it.
Today was day 1, I started by trimming new Lapua 6BR Norma brass to 1.520", i then loaded 12 grains of Bullseye in them with a Remington, 7.5 SRP. Then i filled the cases with Italian bread crumbs, and seal them with bar soap, paraffin, or bees wax.
This makes for very uniform fired cases, after a final trim length of .1505" for their finished length, they are ready to load. Yes they have a donut, but for my aplication, even on a zero freebore chamber, I will never come close to seating a bullet deep enough to contact the thicker neck material. I don't see a need to worry about the dognut?
I loaded the 20 cases with 34.8 grains of N130 ans same 7.5 Remington primers. Sized with Br Body die for .002" shoulder bump. Then I use my Wilson Br bushing die to size the neck @ .326" and set my seating die for a hard jammed bullet. I did this by starting a bullet, then chambering it. That seated the bullet about .020" deeper in the case, which was what I used to adjust my seating die for that depth.
This was with 20 cases. Zero"d using the load above with 5 cartridges then shot 5 for group, the next 5 I seated the bullets .010 deeper. The shot abot .2". The last 5 cases were sized with a .325" bushing and back out to the full jam length the first 5 were shot at. Didn't like either neck tention with the bullets crammed that hard into the lands.
The .010" deaper seated load was pbviously more well liked.
But after reading this, I don't understand the reasoning, that the dognut would afect anything. If it were a 10 twist, or I was seating 130 or 150 grain bullets. I could see the dongut causing concern. But with a 112 115 or 118 bullet, I don't see a need to worry about it? Am I overlooking something?
To me, i have a no turn chamber.
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wildcatter
Silver $$ Contributor
My second time out, this no turn process I tried is working. A Savage Axis in a custom laminated Walnut Stock and 8-32×60 LRP. All work done by Fred @ Sharp Shooter Supply, including chambering the1-17 Lilja 3 grove with Robbinet spec reamer w/ .333 neck. This the second fireing on the brass.
View attachment 1692388
Left group was 35.3 grains.
We will see how this goes with more rounds on the brass. I am over .125" from seating to the donut. I'm pretty happy with in the Varmint stock, and will see if neck tention, seating depth, maybe .3 grain less or more will do any better. But for what it is, if it just repeats, I'll consider this good enough for my first attemp with a 30 BR!
I posted the wrong pic first, two of the same group. This is what i ment to post, 3 cases with the 12 grains of Bullseye topped with bread crums, and the bottom two with tissue packed on top to seal the loads.
View attachment 1692388Left group was 35.3 grains.
We will see how this goes with more rounds on the brass. I am over .125" from seating to the donut. I'm pretty happy with in the Varmint stock, and will see if neck tention, seating depth, maybe .3 grain less or more will do any better. But for what it is, if it just repeats, I'll consider this good enough for my first attemp with a 30 BR!
I posted the wrong pic first, two of the same group. This is what i ment to post, 3 cases with the 12 grains of Bullseye topped with bread crums, and the bottom two with tissue packed on top to seal the loads.
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butchlambert
Site $$ Sponsor
I have a Robinet spec ed reamer with a .339.
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