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Bartlein New Barrel Material 400MODBB
- Thread starter Frank Green
- Start date
No issues with the reamer as long as it's a good tool.
Yes the material does cut a little different but we are running the same speeds and feeds with no issues. Same with threading etc...run your same speeds and feeds.
We just JGS and Manson reamers.
Later, Frank
Where can I get one of these in a Desert Tech SRS profile?
It doesn't look like any of the standard Bartlein contours have a long enough shank, which according to this is 1.25 diameter x 4.5-ish long.
It doesn't look like any of the standard Bartlein contours have a long enough shank, which according to this is 1.25 diameter x 4.5-ish long.
Give them a call, they do contours besides the standard ones. I haven’t asked about that contour, but I bet they will do it.
If you get one uncontoured I can contour it for you.
@Frank Green
Thanks! Great info, it casued me to order one...lol. A 400MOD BB in 6.5 from Bugholes is arriving later today for next build. Thinking 6.5 GAP 4S or 6.5 PRC.. Anyway, have run your SS 5R barrels for years in .308 and a 6.5CM and they are the bees knees. Shot the heck out of the 6.5CM, burned the throat out chasing speed...(oops lesson learned). Had it set back and shazaam...back to a .25 MOA rifle when on the rare occasion I drive it right. Outstanding barrels, happy customer.
Thanks! Great info, it casued me to order one...lol. A 400MOD BB in 6.5 from Bugholes is arriving later today for next build. Thinking 6.5 GAP 4S or 6.5 PRC.. Anyway, have run your SS 5R barrels for years in .308 and a 6.5CM and they are the bees knees. Shot the heck out of the 6.5CM, burned the throat out chasing speed...(oops lesson learned). Had it set back and shazaam...back to a .25 MOA rifle when on the rare occasion I drive it right. Outstanding barrels, happy customer.
I did the 22 creed with the BB material. I was running 95SMK at 3130ish. I could get them faster without any signs of pressure. Not saying that pressure wasn’t there. The load was 39.2 of H4350. When I hit around 300 rounds the throat started to grow. It would grow only 2-3 thou every 100ish rounds. You could feel the throat area getting heat checked pretty good around the 450 round count. At about 670ish rounds it started blowing up bullets. I cleaned it very good. Also, I only put around 100 rounds on it between cleaning. I brought it to work to look at it with the bore scope and to show Tracy and Frank what is going on. I cast a lap to lap the throat alittle. I gave the throat area about 15 strokes and then pushed it out. Cleaned the barrel and remeasured the growth. It had grown 120 thou. The lapping removed most of the fire cracking in the throat. The barrel had 761 rounds on it. Awesome round but not for prs style shooting. If I try it again I’m going to use H4831SC. Maybe I’ll get better barrel life with that powder. But, it only maybe 100-200 more. Who know. Barrel burning calibers are going to kill barrels. There is no way around that. I really don’t see someone getting around 3k rounds out of it. That is a small hole with a good amount of powder (heat) going down it. I hope this helps you.
I put one on order for a 7mm Sherman Short project, a 20” 8.5 twist #13 Remington Varmint CF in 400MODBB. I’m hopeful the steel will let me get a few more rounds out of it than I would otherwise. I’m not really expecting to save money, just some time and inventory carried. With unpredictable lead times, if this one works out, I’ll just order a small number to keep on-hand. It’s be nice to order 3 backups instead of 4 if the extra round count works out.
Oh yea no doubt, by "save money over 3-4k rounds" meant buying 2-3 barrels vs 4-5, etc
Thanks for the feedback.
My interests in 22 CM are hunting / varminting so keeping it cool to preserve life wouldn't be an issue.
I appreciate the detailed response.
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I bit the bullet through GAP recently and had them order a custom spec Bartlein 400BB barrel for my upcoming 300PRC build. I decided to go full truck axle with a 1.250" straight, planning for 30" finished length.
I ordered a 400modbb from Short Action Customs for my Desert Tech. I'm sure they can hook you up too. They're excellent to deal with.
It shoots like a Bartlein usually does. As for longevity I don't know yet. It costs about what a chamber job does to get the upgrade, so unless you are going to get double the lifetime it isn't economical probably.
im sure the math is here somewhere else too
but assuming 50% gain which has been reported
regular barrels
$2100
3 x $700 for blank and chamber
2000 round life. 200 rounds for speed up and load development
6000 total rounds
5400 usable rounds
mod400BB
$2100
2 x $1050 for blank and chamber
3000 round barrel life. 200 rounds for speed up/load development
6000 total rounds
5600 usable rounds
the break even is somewhere between 40% and 50% if you're talking bartlein/kreiger/etc blanks and chambers.
if you talk proof prefits then it's not even close (unless you consider the pain of load development and break in as a factor)
and $700 is pretty low for a lot of blank/chamber jobs now
Yeah I just dropped almost $1500 on 2-1.350 shanked modBB blanks. I hope they live up to the hype…. I’m sure they will as Bartlein is a standup company.
Available? You just have to order one. You’ll get it next year. Alternately you can buy one from a stocking vendor like bugholes.
DT barrels might take a bit longer unless you get lucky and squeeze into a run. I ordered a 26” DT contour 400MOD (7 SAUM) from SAC in Jan 21 received it Apr 22. Fuckin thing is perfect.
Once I finish up load dev on my hunting build I’ll start testing on it. Shooting 184 hybrids, H1000 and ADG brass.
I’m w Supersubes, Bugholes was great. At the time I called, they didn’t have the contour I wanted but they were able to tell me what they expected to arrive in the next few weeks and suggested I put it on my wish list on their site. Got an email when I came in and I bought it…actually got two Bartlein barrels from them.
I did order a .264 MTU w left hand gain twist in the new MOD400 steel and expected it to take a year. Well, it came in right about 7 months which was a pleasant surprise.
Put one on order w Bartlein…and it may take a year…then look to bugholes, Altus, and similar outfits who stock component parts, incl barrels, regularly to use now.
Or at least those are my thoughts.
Checking back in on the barrel life increase, @Frank Green indicated earlier in this thread that a 6.5CM pressure test barrel put up a 100% increase over standard 416 (3500 rounds vs 1700-1900 max).
Are folks seeing 50% increase, or are people seeing more? ~$750 for a blank plus chamber/thread versus $950 for the same in BB would be worth it even at 50%, and if you're talking carbon forget about it, it's a no-brainer unless you're not ever expecting to use the full barrel life.
I have no doubt additional chromium will resist heat and abrasion better than not.
Has anyone compared data between manufacturers and/or rifling configurations?
One of the longest lasting barrels I've ever seen has been a Schneider 3-groove. Could have been an outlier but I remember the land/groove ratio being very heavy to the land side.
Maybe FrankG can shed more knowledge on the specifics of certain land/groove ratios.
Ern
Has anyone compared data between manufacturers and/or rifling configurations?
One of the longest lasting barrels I've ever seen has been a Schneider 3-groove. Could have been an outlier but I remember the land/groove ratio being very heavy to the land side.
Maybe FrankG can shed more knowledge on the specifics of certain land/groove ratios.
Ern
How many are using 400MODBB in their gas guns? Craddock offers the Bartlein 400MODBBwith their AR barrels, just curious if there is a marked improvement with how the barrel handles heat from steady semi auto fire, some barrels begin to open up and lose accuracy the more the barrel heats up.
I'll post this in the semi auto forum as well.
I'll post this in the semi auto forum as well.
So I have a Mod400 barrel for my 6BRA. Running 31gr of varget and 107's at 2930fps. I am ~1200rds into this barrel and so far my throat has grown ~10thou. This barrel should go at least 4K if not more with no problems. Going to be getting a borescope in the next few weeks and can update with photos when that arrives.
I've gone through 5 of them so far. I have nothing bad to say about them. They shoot just as good, clean up quicker, and last longer. I've pulled my last 6 GT off at 4300 rounds and it never gave up the ghost. I've got a carbon wrapped one as well that is a hammer. All of my comp guns use them and they are super consistent as you would expect any Bartlein to be.
I think they really make sense if you're the guy doing some fancy fluting or coatings and using some of the more barrel burning rounds.
So far, I'm a fan!
I think they really make sense if you're the guy doing some fancy fluting or coatings and using some of the more barrel burning rounds.
So far, I'm a fan!
I have 6mm creedmoor barrels from wilson blanks, proof, bartlien, and bartlien MODBB. The MODBB is tougher steel just based on watching the gas port with a bore scope. The proof is wearing way faster at the gas port than any barrel. The wilson breaks in the fastest but then plateaus and the proof looses material noticeable every time I look in there. The location of the port on the proof was perfect center bottom of groove so no ridge to hit. The MODBB the worse location for wear, literally rifling is chopped in half on the MODBB so hit a ridge. I only ever shoot max 5 shots at a time with each barrel. All shoot under half inch groups with factory 108 at my elevation. Only the 7.5 twist barrels do well below 1200 ft. These are long range coyote rifles that I do practice with when calling has been slow.
I'm holding out ordering one until they come out with a non-stick/non-cleaning barrel.
Right? Or someone invents a barrel cleaner like those little robo pods that travel oil pipelines and clean them automatically.
Perpetual motion machines, cold fusion and self cleaning bullets.
#worldproblemssolved
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