No idea what gave me donuts. Just that the shorter .090 freebore put the shank of the 105 gr bullet right in the donut area. I still run the 6XC, but had a custom reamer made with almost similar specs that Mr. Tubbs mentioned and I also switched brass.
6XC ground truth as of Jan 2020?
- Thread starter Boatschool02
- Start date
urbanrifleman
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Donuts are coming from having the necks too tight to the loaded round. Nobody ever had donuts before every became infatuated with making the necks so small... which does absolutely nothing for accuracy, but does result in the donut growing inward not outward.
Mr. Tubbs Manson reamer will work with both Peterson and Alpha. I think he mentioned .160 freebore, 1.5° lead, .278 neck, but I can’t remember the web area off the top of my head. Maybe .4705?
Good thing I have always used a .242 expander mandrel before loading, which gives me .0015 neck tension.
The easiest solution is to order a reamer with David Tubbs specs either from SSS or from Manson, and use Petersen brass and Tubb’s dies. This will also work perfectly well with Norma brass. I believe a CIP reamer from JGS or PT&g would also work with this combination. If I did not already have a number of barrels chambers in 6XCII, I’d go with option A.
Alpha brass is supposedly manufactured for the 6XCII chamber. If you were to chamber a barrel with a 6XCII reamer and attempt to use dies not specified as 6xcII you would likely end up shaving brass off the cases at the .02 line. I had a horrible experience with Alpha brass. I tried every suggestion they offered to get their brass to work including trying several different chambers. In the end, I had two case ruptures, a broken rifle, and never got the brass to work.
There is very little difference in the 6xc and 6xcII chambers. 6xcII was mostly a gimmick solution looking for a problem. New Petersen and Norma brass works just fine in a 6xcII chamber. However, care must be taken when resizing to reload the brass.
Guys, the gentleman who developed the 6XC round and has been using it with great success for the last 20 years has made it about as easy as it can get. He has posted here and in other places exactly what to do to be successful with 6XC.
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I agree with both of those statements for the most part.
I'm including reamer specs here for what I believe to be the original 6XC chamber design (Hugh Henriksen and David Tubb dating to July 2003) as well as RCW III's two 6XC II variations some time later:
I'd very much like to see current 6XC specs posted here by SSS and for what Manson is providing now to see what kind of evolution this cartridge's chamber design has undergone in 17 years.
I quipped in an earlier post that "All 6XC chambers are not created equal." and I'm sure there have been 'variations on a theme of 6XC' not evident in the specs I'm including here.
H4350 or IMR 4451 treated with TUBBDUST. Slightly above or below 41 grains
Shooting out of a TUBBGUN with a 30-31" Schneider 5P 7twist barrel.. I have had a couple of barrels that would yield 3225 fps but that load is a max load.
Using S&B large rifle primer which is a mild primer which typically allows more velocity with less pressure. Russian primers were well back from these velocities with pressure signs.
Coated 115 DTAC can touch or jump doesn't matter. Which ever shoots the best.
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OK that's encouraging David yet I'm having trouble finding that particular page?
Here's a link to your 6XC Manson reamer page; one to the section entitled Accuracy Reloading that includes many 6XC items; another using your website's Search function for 6XC and couple done the same way using 33XC and 37XC.
Going to https://mansonreamers.com/ the availability of 6XC reamers is indicated as of February of 2018 while a search there for 6XC comes up empty.
Going to his latest catalogue (Jan. 2019) 6 MM XC is included under Additional Calibers while there's nothing giving specs for it.
Well-dated 6XC info here deep in this website's resources, while the links to the then-current cartridge specs & load data are no longer functional. (Note that that article indicates reamers came from Henriksen at that time.)
There's nothing left up over at SuperiorShootingSystems.com
Looking in at SAAMI.ORG the major portion of their chamber and cartridge specifications date back to 2015. Cartridge specifications later than that are available here yet in any of that there's no mention of the 6XC or 6 MM XC.
CIP (you've refer to this organization as the European SAAMI) shows the 6XC here but note that both cartridge and chamber dimensions are provided and the metric dimensions need converting to inches....
The major specs you've provided differ from what Henriksen's reamer specs provide. If shooters aren't using your 115 DTAC bullet I (for one) would like to know whether there's a reamer spec design that may be more appropriate for 105-109 grain bullets.
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6XC was never adopted as a SAMMI cartridge. There is a CIP standard for it. The reamer you’re looking for is the CIP reamer.
Boatschool02
Silver $$ Contributor
Tubb and CIP from Manson a week or so ago.
If the original Hendrickson print was put into a museum and never used to grind another reamer again, this would be much easier. It’s based of the .22-.250 case, and all current manufacture 6xc brass is based off of .308. The newer brass has a slightly larger base and thicker neck.
So it's a lot like the circumstances around what's called 6BR huh?
I agree that a museum exhibit might serve some purpose but those of us having chambers cut with reamers ground to Henriksen's specs - either sourced from David or through Hugh himself - before things took a turn back several years ago to a 308-based cartridge update would have benefitted from hearing that the change had been made.
After all it's been called 6XC since the beginning, yes?
I gave up on the Norma-sourced 6XC brass in favor of making mine from Lapua Palma brass after that appeared. It still works in the Henriksen-spec chambers I have.
But then I don't shoot 115DTAC's @ 3,200 fps either.
22-250 was what served at the beginning but then 308 got into the mix, caused the confusion.
Mr Tubb’s comments on the 115 DTAC Manson reamer file above are worth taking note of. Interesting info on the larger neck diameter of .278 to deal with carbon buildup.
Wouldn’t something like the .100 throat that a 6x47L uses, also work for this XC for the 105 type bullets.
Wouldn’t something like the .100 throat that a 6x47L uses, also work for this XC for the 105 type bullets.
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Would anyone mind sharing what sizing die / reamer print combination they have found to work well together, especially curious what print works well with the Redding bushing dies.
Boatschool02
Silver $$ Contributor
That's why I started the thread.
Just trying to find out which dies match which reamers and brass.
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For anyone who doesn't mind sharing, we'd welcome your log data on:
new, fired, and sized brass with WWW Brass, YYY reamer, and ZZZ die.
Many thanks in advance,
You’d have to call the guy who did mine. Like I said, grizzly reamer, throated to a dummy round.
tclaunch
Silver $$ Contributor
Will you say what FL die you are using?
Quick look on Grizzly site. The .200" line is .4695" .098" FB and .275" ND
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