AlNyhus
Silver $$ Contributor
A straight line rather than a wave would have me checking my neck clearance. -Al
30BR ?
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jimmymac
Jim McGregor
Exactly
No sir , no annealed here.
Yea contrary to some belief that you need a straight line around the neck to prove a good seal I agree with the sine-wave pattern. There has to be clearance in order for the bullet to release freely.
The straight line is said to indicate there is not enough clearance for bullet release.
NorCalMikie
Gold $$ Contributor
Could be fact OR that some folks don't bother to leave themselves some wiggle room, just load to the MAX then wonder why the brass is crap??
Mid range load on ANY round gives you longer brass life.
Maybe consider a NO TURN NECK chamber so you can just load and go shooting?
More time pulling the trigger and LESS time messing with brass.
AlNyhus
Silver $$ Contributor
Did you read post #23 re: no turn 30BR necks?Maybe consider a NO TURN NECK chamber so you can just load and go shooting?
More time pulling the trigger and LESS time messing with brass.
NorCalMikie
Gold $$ Contributor
Yes I did!! I just went back and looked again.
Funny that when I go from 6mm to 6.8 with a mandrel, I don't get that LUMP.
I use .0015" total neck clearance with no problems and don't have the "straight line" either. I can enter a bullet into the fired case neck(just slides right in) also without force indicating enough clearance. Southeastern benchrest Hall of Fame shooter Ed Watson used only .001" total clearance per his article in The Benchrest Shooting Primer book. Now I'm talking about a 6PPC not a 30BR....I don't have any experience with a 30BR and I don't run the pressures ya'll do.
Stay safe..
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Link
Silver $$ Contributor
Hay Al, could you reeducate me, is lump a thick spot that should be turned down? If so and you don't it becomes a dough nut on the inside. ?The Robinett V2.0 reamer is a .331 neck. It's also a smidge bigger at the back end that the original 30BR Robinett...of which there is only one real version.
When you mechanically neck up from 6 to .30, the 'lump' at the base of the new neck measures right at .337. Trying to do a 'no turn' 30BR on mechanically expanded 6BR cases.....the neck diameter would have to be large enough to accommodate the 'lump'.
The 'lump':
Good shootin' -Al
ty Don.
Dolomite
Silver $$ Contributor
Al is one of the god fathers of 30 BR well respected for his knowledge and advice that he shares.
AlNyhus
Silver $$ Contributor
Don, the 'lump' is simply what used to be the upper shoulder area of the case when it was a 6BR. When expanded to .30, the upper part of the shoulder also has to expand...and since that part of the shoulder is thicker than the neck, the extra thickness is visible as the 'lump'. My preference is to turn the 'lump' off as a preliminary step prior to neck turning. After de-lumping, I put the cases through a die that sizes the entire length of the neck to straighten the necks relative to the long axis of the case body prior to neck turning.
Hope this helps.
-AlAlNyhus
Silver $$ Contributor
With adequate neck clearance and well turned necks, here's what the 'wave' looks like. On a two lug action, you'll see two waves. On a three lug, you'll see....wait for it....three waves. As neck clearance decreases, the 'wave' will be shorter (further up the neck). At some point as neck clearance decreases, it will start resembling a straight-ish line. The wave can also be a good indicator of the tune up....if you're familiar with the gun.
Good shootin' -Al
As neck clearance decreases, the 'wave' will be shorter (further up the neck). At some point as neck clearance decreases, it will start resembling a straight-ish line. The wave can also be a good indicator of the tune up....if you're familiar with the gun.
Good shootin'
-Al
This is what I want to see on my turned neck brass.With adequate neck clearance and well turned necks, here's what the 'wave' looks like. On a two lug action, you'll see two waves. On a three lug, you'll see....wait for it....three waves.
Good shootin'
FNSafari
Gold $$ Contributor
Hey Al, put some hand lotion on those chapped fingers...is it that cold in SD alreadyWith adequate neck clearance and well turned necks, here's what the 'wave' looks like. On a two lug action, you'll see two waves. On a three lug, you'll see....wait for it....three waves.
Good shootin'
AlNyhus
Silver $$ Contributor
Yeah...my hands take a beating in cooler weather. O'Keefe's does a pretty good job. Pretty soon I'll be into bullet making mode and the lanolin helps.Hey Al, put some hand lotion on those chapped fingers...is it that cold in SD already
If we make it Thanksgiving without having to shovel or fire up the snow blower...that's about as good as we can hope for. Stay warm up there, buddy.
-Al
Colder temps. and having my hands in water a lot always caused them to be dry and chaffy.Yeah...my hands take a beating in cooler weather. O'Keefe's does a pretty good job. Pretty soon I'll be into bullet making mode and the lanolin helps.
Stay warm up there, buddy.
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