I have one in my safe at the moment - 7mm, 8.5 left hand twist, 4 groove finished at 32". It's chambered in 284 Shehane and has done over 2500 rounds and it still shooting lights out. It takes a good 7-8 shots to settle down after being cleaned back to bare metal, but it's probably the most accurate barrel I've had. My gunsmith took a look down the tube recently and aside from the usual wear around the lands, the rest of the barrel looks Mickey Mouse, it's like nothing he has seen previously so I put that down to the steel. I do have another on order.
Bartlien MOD 400, experiences?
- Thread starter Sgt. Brumbaugh
- Start date
I have a friend that's thinking about having a new barrel chambered up in 7mmSTW and the mod 400 steel sounds like that's his best way to go since he shoots it a bunch.
jackieschmidt
Gold $$ Contributor
I answered the “accuracy” potential of the Mod 400 steel when Bartlien sent me one in 30 caliber, 1-18 twist, HV profile.
I put it on my favorite VFS Rifle, and it shot exactly like my Bartlien Barrels in 416R. Of course, the barrel life thing might be a moot point with a 30BR, as they are VERY easy on barrels.
As for the machining, I machine various steels on a regular basis, and the 400 Mod cuts closer to typical Chrome Moly than 416R as far as torque on the reamer. Threading is no problem whatsoever ever as I thread with carbide top lock inserts at 250 rpm.
As for the added cost of a blank, Tooling cost might account for much of this, as the loss of machinability in deep hole drilling, reaming, and single point rifling is probably harder on tooling than with 416R. If the steel is a true proprietary item, I can see a higher cost in the initial steel as manufacturers do tend to charge more per pound for special melts.
I was going to take the drop off of my blank to my local lab who does our metallurgy testing to get it analyzed to ascertain the exact chemical and alloy content, but never got around to it.
I put it on my favorite VFS Rifle, and it shot exactly like my Bartlien Barrels in 416R. Of course, the barrel life thing might be a moot point with a 30BR, as they are VERY easy on barrels.
As for the machining, I machine various steels on a regular basis, and the 400 Mod cuts closer to typical Chrome Moly than 416R as far as torque on the reamer. Threading is no problem whatsoever ever as I thread with carbide top lock inserts at 250 rpm.
As for the added cost of a blank, Tooling cost might account for much of this, as the loss of machinability in deep hole drilling, reaming, and single point rifling is probably harder on tooling than with 416R. If the steel is a true proprietary item, I can see a higher cost in the initial steel as manufacturers do tend to charge more per pound for special melts.
I was going to take the drop off of my blank to my local lab who does our metallurgy testing to get it analyzed to ascertain the exact chemical and alloy content, but never got around to it.
SteveOak
Gold $$ Contributor
Where do you get a barrel nitrided please?
H&M Metal Works in Ohio.
SteveOak
Gold $$ Contributor
Thanks!
ELR LVR
Silver $$ Contributor
Is this more of a Melonite? rather than Ti Nitride?
ELR LVR
Silver $$ Contributor
For what its worth, my current 6x284 / Krieger Barrel / 3400 fps
I measured the throat erosion recently at about 1200 rounds and it showed only .010" from when new
I was amazed to say the least
I still use the same seating depth as day one and it's still on at Long Range
-----------------------------------------
The only thing I do different than before is
I use HBN coated bullets
WSnyder
Silver $$ Contributor
Melonite is someone’s name and version of salt bath nitride so in an overall sense it’s still just “nitride”.
ELR LVR
Silver $$ Contributor
Right but those 2 Nitrides are very different from each other, hence the reason for clarification
Also given that there are various other Nitride coatings
The word "Nitride" gets thrown around as if its a general common thing as Cerakote or Parkerize
--------
Another reason I ask is since Ti-Nitride is harder than Carbide I keep waiting for someone to come up with a way to TiNi all the way down the full length of a bore
Last I checked with a company it is more of a Vacuum plasma process that can only get about 1.5 inches down the bore
so if someone came up with a process that would be cool, (a new advancement so to speak)
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ELR LVR
Silver $$ Contributor
Really? That sounds like a lot of microns
I read
BryCoat Titanium Nitride (TiN) Coatings
- Thin film typically 3 µm (0.000118”)thick
jelenko
Gold $$ Contributor
Well - 0.000118 is 118 microns - yes?Really? That sounds like a lot of microns
I read
BryCoat Titanium Nitride (TiN) Coatings
brycoat.com
- Thin film typically 3 µm (0.000118”)thick
ELR LVR
Silver $$ Contributor
No Sir,
Micron is metric = 1 millionth of a Meter
Not Microinches but more like = 1/26,000 of an inch
(I understand, it can be confusing when they throw in metric with our inch units)
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118 millionths of a meter is equal to .00465"
1 Micron is approx. .000039" or .039 of one thousandth
so 3 x .000039" =?
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WSnyder
Silver $$ Contributor
1 micron is for sure .000039” but how do you get that .000039” equals .039 thousandths of an inch? That’s not correct. .000039” is in thousands of an inch and in no way converts to .039”
ELR LVR
Silver $$ Contributor
I meant to say .039 OF one thousandth of an inch
We could say .039 thousandths as I originally posted
But what youre thinking is
39 thousandths which is not what I said
Anyway I corrected it so hopefully it makes more sense now
now for our proofs
Take your handy dandy TI-35 and multiply .001 x .039 and you will get .039 thousandth of an inch
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I was more trying to show how much of a fraction of a thousandth it is as opposed to suddenly calling it
39 "millionths" of an inch which may get even more confusing lol
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46and2
Silver $$ Contributor
How much is that in Planch scale?Well then let’s confuse the issue even more:
1 micron = 3.240779282945385E-23 parsecs
WSnyder
Silver $$ Contributor
Dunno but it’s 1.0936132983377078E-8 soccer fieldsHow much is that in Planch scale?
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