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7 BR case forming

askari

I've had good success with DJ case forming of 30BR brass from 6BR new brass. Here's the question: has anyone formed 7BR (Remington chamber) brass from Lapua 6BR brass? Does the conversion work and are there any downsides? (DJ will hydroform the brass and provide a uniform neck thickness. I just want to be assured that the conversion works.)
 
Since the 7 BR came first and the 6 BR was originally formed by merely necking the 7 BR cases down, I can't see any problem. Actually, you can probably neck the 6 BR up with a simple pass through your 7 BR sizing die. I've never done it, but others are sure to check in.
 
One pass with a 6.8 (.270) mandrel got me to 6.8 from 6 BR with no issues so the same routine shouldn't be an issue. Up to 7 with the mandrel then a full length die pass and BINGO, 7 BR.
Go easy with the annealing so the necks don't end up down in the case body. :oops: :(
 
Whatever happened to the 7BR? By coincidence, I was having this conversation yesterday - we were discussing a mutual friend, now passed, who had 2 7br's built ,back in the 90's One was a silhouette pistol, the other a lightweight "bush" rifle. Both were made on Chinese actions with Tru-Flite barrels.
 
NZ_Fclass said:
Whatever happened to the 7BR? By coincidence, I was having this conversation yesterday - we were discussing a mutual friend, now passed, who had 2 7br's built ,back in the 90's One was a silhouette pistol, the other a lightweight "bush" rifle. Both were made on Chinese actions with Tru-Flite barrels.
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Rem 7mmBR kind of faded with the decline of IHMSA. I had a factory Rem XP100 in 7BR. The cartridge with a 140 gr bullets has plenty of oomph to nock over the 200 yards rams, but was not as ergonomic to shoot right hand with the right side bolt handle. Went back to using a T/C Contender in 7mmT/CU which good enough for 40x40 scores. The XP was good at anchoring Michigan whitetail out 250 yards with a Sierra 130 gr SSP.
 
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PRR1957 said:
Rem 7mmBR kind of faded with the decline of IHMSA. I had a factory Rem XP100 in 7BR. The cartridge with a 140 gr bullets has plenty of oomph to nock over the 200 yards rams, but was not as ergonomic to shoot right hand with the right side bolt handle. Went back to using a T/C Contender in 7mmT/CU which good enough for 40x40 scores. The XP was good at anchoring Michigan whitetail out 250 yards with a Sierra 130 gr SSP.
Click to expand...
I agree. I still have my 7BR XP100, different stock, but sure wish it was a left-handed bolt.
 
My defiance action custom 7br. Use it for IHMSA. Use Peterson 7br in it. Works like a dream & scary accurate!!
 

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What I'am usually doing is, building a dummy round to send out and have a reamer cut to those specs.
Mandrel to open the neck, bullet seated where I want it and neck OD set so there's no neck turning needed. ;)
 
Chamber cut, primer seated, powder added and bullet seated to YOUR specs. BANG, brass formed. Maybe again,just in case. ;)
 
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