6mm BRZ

[rockhound78]

Ok, I am sure you are wondering WTF I am talking about. Its a 6mm GT case run into a 6mm BR size die to set the shoulder back so the start of the shoulder forward, matches a 6mm Br case. We have varmint silhouette shoots and our farther target is a chicken @500yds and was thinking about a little more horsepower than the 6mm br. Lo and behold was going thru my reamers and found a 6m Br Remington reamer with a Norma length neck. Ran it into a 243 barrel with back half of chamber cut off, to make a brx, but didn't like the short neck when using 6mm br brass. My bullets were barely in the neck if I seated them anywhere close to touching lands. Looked at 6mm gt specs, soooo, ran my 6mm br reamer deeper in the 6brx chamber to make a BRZ. 85gr Sierra BTHP are about the heaviest I plan on using, so wanted a bit more neck than the BRX.

I ordered some 6mm GT brass. Brass came in Saturday, so formed about 30 pieces of brass and loaded with increasing charges of Varget and 80/85gr bullets. Tried to go to the range yesterday. It was about 46 degrees there, but the wind was about 30 mph @3:30, so headed back home instead of wasting bullets.

Ended up with a bit more capacity than the BRX, but with the long neck of the Norma 6mm Br.

Why did I do it? Lets say I am "Thrifty", but my wife calls it "cheap" at certain things. I had the reamer already and an extra 6mm br size die, so why not. Saves buying a 6mm gt reamer and new dies and should be enough for our varmint silhouette shoots. Will see how it performs when weather changes a bit

Here is a pic. 6mm GT, BRZ w/80gr Nos.BT, fired BRZ, BR, BRX.

 

[Capt. Oblivious]

Looks really good

 

[Zero333]

Pretty kool thinking outside the box.

I like it !

 

[urbanrifleman]

We did the same thing forming 6xc out of 243 brass.

I think longer necks would END this whole debacle of needing special freebores for every stinking bullet. And the word is that longer necks are easier on the throat.

 

[urbanrifleman]

I am kind of surprised no one ever did a long necked Dasher. That would make a lot of sense. Blow that shoulder out to 40 degrees and you might have something even better.

Although I really like this cartridge you made.

 

[newbieshooter]

I am kind of surprised no one ever did a long necked Dasher........

I recall the Norma Dasher has a neck that was ~.060 longer than a standard dasher ?



http://forum.accurateshooter.com/threads/new-production-norma-6mm-dasher-brass.3966334/
http://forum.accurateshooter.com/threads/norma-6-dasher-brass.3949642/#post-37196179

 

[urbanrifleman]

If Lapua made Norma Dasher brass it would probably be the most popular 6mm cartridge.

 

[rockhound78]

"If Lapua made Norma Dasher brass it would probably be the most popular 6mm cartridge."

I think "urbanrifleman" is spot on with that thought

 

[Dusty Stevens]

"If Lapua made Norma Dasher brass it would probably be the most popular 6mm cartridge."

I think "urbanrifleman" is spot on with that thought

Thats right, the biggest drawback of the norma dasher is having to use norma brass.

 

[rockhound78]

Went to the range to try out a few loads while fireforming brass. Was just using cheap 80gr btsp Graf's bullets I bought about 5 years ago. 33.9gr Varget @3249fps, first two shots were about a caliber and a half wide and pulled the third (all I had) about 1/4" left (did I mention it was 19 degrees and my hands were getting numb). 34.5gr Varget went 3361fps. Primers still look OK. Might have to try some 95gr bullet as supposed to keep over 22cal rounds 3200fps and lower so to not damage targets. Sierra 85 bthp #1530 next to try along with some Speer 85 btsp and 95gr Nosler BT's