1X fired 6 Dasher brass not sealing
- Thread starter TackDriv3r
- Start date
"Modular Sizing die Alpha Dasher is intended for chambers reamed with the Alpha Legacy reamer specs with utilizes a .0750 Neck / Shoulder radius and a .0300 Body Shoulder Radius."
OR
"The Modular Sizing Die for Dasher works with rifles chambered using a .060″ neck/shoulder radius and a .000″ shoulder/body radius reamer."
I dont see a SAAMI standard for 6 mm Dasher?
OR
"The Modular Sizing Die for Dasher works with rifles chambered using a .060″ neck/shoulder radius and a .000″ shoulder/body radius reamer."
Manson Reamers' Alpha reamer (spec order) neck dimension is 0.275".
I dont see a SAAMI standard for 6 mm Dasher?
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I have loaded 3 cases tonight after annealing on the 2X fired cases, used .265 bushing without the mandrel and its .005" off the lands.
Other 6 is the same charge with 31.8 grains to yield 2940 fps, 3 of the 6 is .010" jam with .001" neck tension, the 2nd 3 is .005" off. Let me try those out and hopefully see something positive.
I believe the gunsmith used an Alpha reamer and no turn is .275. On a few fired brass I have measured the OD of the necks, it shows .274" with some springback, should be a .275".
If I had known that there would be .007" clearance, i would have asked for a .272" no turn since I have .268 loaded neck.
It's at .002" shoulder bump. Fired brass was at 1.193" using SAC headspace, and after sizing its 1.191"
Also tried .1.192" and closed bolt, and I feel little resistance, so I tried the 1.191" and no resistance.
This has been my experience as well.
There would seem to be 2 different Neck/shoulder Bushings?
Need the correct neck/shoulder bushing for the Alpha Brass?
"Note: These Dasher Bushings are for chambers with a .060″ Neck / Shoulder Radius and a .000″ Shoulder / Body Radius. Not Alpha Legacy ® Chambers."
shortactioncustoms.com
Correct bushing for Alpha Dasher-
shortactioncustoms.com
"Note: “Alpha Dasher” bushings are specific to rifles chambered with Alpha Munitions Reamers. Only select “Alpha Dasher” if your rifle has an Alpha Dasher chamber."
Need the correct neck/shoulder bushing for the Alpha Brass?
"Note: These Dasher Bushings are for chambers with a .060″ Neck / Shoulder Radius and a .000″ Shoulder / Body Radius. Not Alpha Legacy ® Chambers."
Dasher - Neck/Shoulder Bushings
Dasher - Neck/Shoulder Bushings achieve consistent accuracy, providing reliable neck tension for precision reloading and enhanced performance in every shot.
shortactioncustoms.com
Correct bushing for Alpha Dasher-
Alpha Dasher - Neck/Shoulder Bushings
Alpha Dasher - Neck/Shoulder Bushings upgrade your reloads with high-quality construction for precise neck tension and enhanced accuracy in every shot.
shortactioncustoms.com
"Note: “Alpha Dasher” bushings are specific to rifles chambered with Alpha Munitions Reamers. Only select “Alpha Dasher” if your rifle has an Alpha Dasher chamber."
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Yes, I have the Alpha Dasher bushings. My chamber was cut with an Alpha reamer.There would seem to be 2 different Neck/shoulder Bushings?
Need the correct neck/shoulder bushing for the Alpha Brass?
"Note: These Dasher Bushings are for chambers with a .060″ Neck / Shoulder Radius and a .000″ Shoulder / Body Radius. Not Alpha Legacy ® Chambers."
Dasher - Neck/Shoulder Bushings
Dasher - Neck/Shoulder Bushings achieve consistent accuracy, providing reliable neck tension for precision reloading and enhanced performance in every shot.
Correct bushing for Alpha Dasher-
Alpha Dasher - Neck/Shoulder Bushings
Alpha Dasher - Neck/Shoulder Bushings upgrade your reloads with high-quality construction for precise neck tension and enhanced accuracy in every shot.
"Note: “Alpha Dasher” bushings are specific to rifles chambered with Alpha Munitions Reamers. Only select “Alpha Dasher” if your rifle has an Alpha Dasher chamber."
Attachments
If your gun smith gave you a .275" chamber neck you need a new gunsmith. All the top shooters use a no turn 0.002" neck tension, a few .003".
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Sounds to me like the shoulders are not being bumped correctly (too much in this case)
I would remove the bolt from the gun, remove entire firing pin, spring and bolt shroud from bolt. Carefully remove the ejector from the bolt (careful not to let spring shoot across room).
Now you can take a fired piece of brass and start slowly in small increments size the brass till the bolt just barely falls under it own weight with the sized brass in chamber. Use a shoulder bump gauge to record that measurement. Add .001 of additional bump to insure clearance. This method has worked best for me. This method uses the guns chamber for your measurement tool instead of shoulder bump gauge. Sometimes the gauges/dies don't match the chamber exactly. What's also cool about this method is once the die is set this way you can lock the ring down and never have to fool with it again (if you anneal often).
I would remove the bolt from the gun, remove entire firing pin, spring and bolt shroud from bolt. Carefully remove the ejector from the bolt (careful not to let spring shoot across room).
Now you can take a fired piece of brass and start slowly in small increments size the brass till the bolt just barely falls under it own weight with the sized brass in chamber. Use a shoulder bump gauge to record that measurement. Add .001 of additional bump to insure clearance. This method has worked best for me. This method uses the guns chamber for your measurement tool instead of shoulder bump gauge. Sometimes the gauges/dies don't match the chamber exactly. What's also cool about this method is once the die is set this way you can lock the ring down and never have to fool with it again (if you anneal often).
MY SPECS AS FOLLOWS:
.272 PTG NO TURN 6 DASHER .104 FREEBORE
ALPHA/LAPUA BRASS
6 DASHER WHIDDEN BUSHING FULL LENGTH DIE
.266 TiNi BUSHING
.241 MANDREL
CCI BR4
BERGER 105 VLD (JAM) 108BT (SMALL JUMP)
ANNEAL EVERY FIRING
TRIM EVERY FIRING
UNIFORM PRIMER POCKET EVERY FIRING
.272 PTG NO TURN 6 DASHER .104 FREEBORE
ALPHA/LAPUA BRASS
6 DASHER WHIDDEN BUSHING FULL LENGTH DIE
.266 TiNi BUSHING
.241 MANDREL
CCI BR4
BERGER 105 VLD (JAM) 108BT (SMALL JUMP)
ANNEAL EVERY FIRING
TRIM EVERY FIRING
UNIFORM PRIMER POCKET EVERY FIRING
urbanrifleman
Site $$ Sponsor
6xc Tubb chamber is .277" neck I think? It's won some stuff. Works just fine.
Has the reason been found? Update?
I haven't had time to try a few tests yet, thinking to go this evening or tomorrow.
Why would 2x fired brass require annealing ?
I usually anneal after every firing? Why did you ask?
Clancy
Silver $$ Contributor
I’d much rather have .007 clearance than .002 clearance with a no turn chamber.
Clearance is your friend. The phrase “turn them thin to win” comes to mind.
I’ve shot literal, witnessed, verified .0s with leftover brass turned to .264 in a .272 chamber.
.004 may be ideal, but I’m not scared of .006. The next batch of Alpha might be .270-.271 loaded. Even with Lapua, there’s no guarantee on what it’ll measure.
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