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Post by bradshaw on Apr 24, 2013 15:51:05 GMT -5
John.... I was you I wouldn't turn the brass on a loaded round, a) for the obvious potential hazard, and b) thinning the brass at the "launch pad," or bullet heal. Reckon this "waist" might create a stretch ring in the brass as the cartridge is fired.
To ream a straight channel for the bullet is old hat with the .44 Auto Mag, with brass typically formed from military 7.62x51mm and .30-06 cases, and which sidewalls thicken rapidly toward the head.
David Bradshaw
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Post by subsonic on Apr 24, 2013 16:11:18 GMT -5
If there was a way to turn the outside, it wouldn't end up "wasp waisted". You are removing the same metal, just on the outside instead of the inside. Fire it and size it and it will be the same.
Now, it does sound a lot easier to ream the inside....
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Post by Lee Martin on Apr 24, 2013 16:19:28 GMT -5
Couple of things to note. The step isn't square, it's radiused (I checked the reamer the other day). Also, the ledge isn't that pronounced.....around 0.0015" to be exact. I've inside reamed my 401 Bobcats and 375 Atomics for years. Stretch rings haven't been a problem. -Lee www.singleactions.com"Building carpal tunnel one round at a time" |
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Post by subsonic on Apr 25, 2013 12:13:41 GMT -5
Would anybody be interested at 87 cents each?
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Post by bradshaw on Oct 4, 2019 6:50:44 GMT -5
If there was a way to turn the outside, it wouldn't end up "wasp waisted". You are removing the same metal, just on the outside instead of the inside. Fire it and size it and it will be the same. Now, it does sound a lot easier to ream the inside.... ***** Think about this for a moment: to OUTSIDE NECK TURN a straight wall case, the brass expands under combustion to meet the chamber wall. The brass displaces right at the step. Whereas, there is no displacement of brass from NECK REAMING. Wondered about the difference between NECK REAM (inside) and NECK TURN (outside) back in 1978, forming brass from 7.62x51mm (.308 Win) to 7mm Talbot, a.k.a. 7mm/308x 1-3/4”. And in 1979 with Jim Stekl’s (Bench Rest Hall of Fame) 7mm BR Remington. (Jim Stekl fathered the BR Remington cartridges----.22 BR, 6mm BR, 7mm BR.) Thinking the accuracy from bottleneck cases may be better from neck turning. Silhouetters have employed both neck turning and reaming of bottleneck brass, with reaming probably more prevalent. The bench rest crowd turns necks, and their accuracy imperative is much tighter than than accuracy required to shoot steel. Nevertheless, my Skip Talbot-built XP-100 in 7mm Talbot (7mm/308x1-3/4”) was good enough to group in the brainpan of the IHMSA ram @ 500 meters (550 yards), with Micro rear and .075-inch post front sights. My bottleneck silhouette ammo was all neck reamed, and neck sized for six or eight firings, at which time the I re-reamed the necks. Lee’s lathe-ream method is the proper way. It would require a special REAM DIE to support a straightway case TO DUPLICATE the Lee Martin lathe ream. To do the job with a REAM DIE, I would not be surprised if the straight wall case wanted to spin when you turn the reamer. David Bradshaw |
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Post by 98redline on Oct 7, 2019 16:05:03 GMT -5
I wonder if there is a method that would work to do the inside reaming of the cases for those of us who don't have access to a lathe?
Maybe something like a Forster case trimmer with a reaming die attached as opposed to a case mouth cutter. Just sort of spitballing here.
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Post by bradshaw on Oct 7, 2019 21:11:36 GMT -5
I wonder if there is a method that would work to do the inside reaming of the cases for those of us who don't have access to a lathe? Maybe something like a Forster case trimmer with a reaming die attached as opposed to a case mouth cutter. Just sort of spitballing here. ***** 98redline.... Lee may thrown iron this. Dandy as it is, I doubt the old Foster----or similar-type trimmer----holds a case true enough for reaming.It is not the Foster’s fault. A collet which grabs the rim doesn’t align the case .straight as a die. A ream die captures the case like a sizing die. The reamer is a wobble-free fit in the die. Brass is trimmed to uniform wall thickness all around. David Bradshaw |
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Post by lazytcross on Oct 8, 2019 9:35:12 GMT -5
The issue I see that makes outside turning impractical would be different Bullets. And seating depths. The lee 440 will bulge cases if over-seated in starline brass. And it will always bulge my Winchester brass.
Also depending on how short brass is trimmed.
You might trim the outside to allow a Lee bullet to go in but not the bullet from the original post. Then you are trimming over and over for deeper seated bullets. Just 2 cents
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