• Watch Out for Scammers!

    We've now added a color code for all accounts. Orange accounts are new members, Blue are full members, and Green are Supporters. If you get a message about a sale from an orange account, make sure you pay attention before sending any money!

The new 33XC & 37XC cartridges designed by David Tubb

Question - (since most Bart's barrells are a year out). If this post should be somewhere else, let me know and I'll move it.
thinking KOM here with a 33XC and the 26# weight MAX. I was thinking of going with a BAT action. There are two to choose from.
BAT model M and model L. The Model L requires a 1.5 barrel vs 1.25 on the Model M. Also, if a person wants to move up to 37xc or CheyTec - you can use the Model L
BAT actions:
BAT Model L
load port opening 3.8 ;​
tenion 1.25”​
needs 1.5” barrel​
Bat Model M
load port opening 3.35 ;​
tenion 1 1/8”,​
needs a 1.25 barrel​
1.25 barrels seem easier to come by a possible cheaper (and a little less weight)​

I was leaning towards the model L, in case a person wanted to jump up to 37XC or Larger.
Thoughts?
reason; I'll probably order the barrel before the action, due to wait time.
Thanks in advance
There is another option Pierce 800 series action requires a 1. 350 OD Shank Tenon is 1.187 16 TPI it is between the L and the M Bat action that way you saved on weight but still have an action that can handle even the 375 cheytac size case
 
Contact WTO in Texas, I know they chamber and do load development for the 30XC.
 
  • Like
Reactions: ReturnFire
I got a little crazy and decided to go way over bore. I'm building a 30XC with a 32" mod bb. I've got N570 and H50 but no access to quickloads so I was looking for some input for where to start on load development and powder choice between the two
What bullet are you planning on running?
 
Specs on that barrel

Screenshot_20221105-073621_Brave.jpg



I'd go a little heavier on the taper next time, Greg at Southern Precision wasn't happy with how close it was to the rail and tapered it down a bit. With the flutes it came in at 8.3 lbs finished, so puts the rifle at 24lbs or so, so plenty of room for the elr light class.
 
Last edited:
View attachment 7991741


I'd go a little heavier on the taper next time, Greg at Southern Precision wasn't happy with how close it was to the rail and tapered it down a bit. With the flutes it came in at 8.3 lbs finished, so puts the rifle at 24lbs or so, so plenty of room for the elr light class.
Thanks Greg does great work!
 
Caution! I know there’s no replacement for displacement! Lost .185 of throat erosion w N570 and solids.. 117 rounds down the tube w a modBB barrel. Time to switch up powders and rework a load. RL33/H50 to slow down throat erosion.
I am pulling this statement. I just realized the bullet used was not the original to take the virgin measurements. The Badlands only grew .031 and .016. First time using multiple solids in 1 barrel. Past experience has been w WFL only...Why am i not getting a linear measurement? I am thinking the diameter or angle of the driving bands?
 
Rumor has it over 3200 fps Berger's get a slump nose... i think you would have better luck w a expending mono.
 
It’s at the smith right now so I’m just anxiously waiting. I stockpiled some Berger’s but now I’m thinking I’ve got enough for two barrels lol. I’m hoping for around the 3250 mark which should be pretty narly. I felt like I needed something bigger than my 28 Nos
 
  • Like
Reactions: BCX
What length barrel?
 
I think you will be 3350-3400 fps w ease but don't think those Berger's will hold up.
 
It took forever to get this barrel otherwise I’d order a 7tw to run solids. I should have thought it out a little more
 
  • Like
Reactions: BCX
34” barrel and 8.5 twist Bartlein, 245s hold up to at least 3380fps

 
Has anyone else experienced Badlands pressuring out earlier than the Warners? I know the bearing surface is longer on the Badlands.
Yes, but on a .30 cal in my .300NM.

Don't have my notes in front of me right now, but from memory the Badlands pressured out much earlier than the Warner's.

Edit: @BCX looking at my notes, the Badlands hit pressure much earlier than the Flatlines (went 2 grains higher with the Flatlines and didn't find pressure), but the Badlands were also able to achieve much higher velocity at the same charge (similar weight projectiles at 205's vs 198's).
 
Last edited:
  • Like
Reactions: BCX
Anyone make 37xc in line seater?
ETA For a 375 cal round; a custom seating plug is required. Maybe Wilson would make the plug for you.
The person that chambered your barrel could use the reamer a second time to cut a chamber that will screw onto a 338 cal Wilson inline seater. Just give him the top side parts. Here is one I made
B0654B43-31CE-42AA-B05A-F9BE44B88B93.jpeg
 
Last edited:
It took forever to get this barrel otherwise I’d order a 7tw to run solids. I should have thought it out a little more
How is the 30xc holding up? I found it interesting that you wanted to run a 30XC over a 33XC. I am looking at the 33XC for my next build. Until then I am running a 32" 8tw SS Proof chambered in 30 Sherman Mag. I am running the 245gr Berger Hybrids @3040fps using RL33 and fire formed lapua brass. My average barrel life with both proof and bartlein is 1100 before starting to go to hell. I hope to get about the same out of a 33XC.
 
I easily hit 3400 with the 245’s but the bolt was sticky and showed a little too much growth on the web so I settled just over 3300. It obviously shoots really flat and I had a 4th round hit at 2309 yds. Misses were extremely hard to spot. It took 22 mils of elevation at that distance. First round hit at 1950. After about 55 rounds it was dirty enough to increase the pressure so much that the bullets over spun and came apart in flight. I’m using an 8tw barrel so I’m roughly 297,000 revs. Quick clean and it was shooting lights out again. During load development I ended with a 1” group at 400.
 
  • Like
Reactions: BCX
I easily hit 3400 with the 245’s but the bolt was sticky and showed a little too much growth on the web so I settled just over 3300. It obviously shoots really flat and I had a 4th round hit at 2309 yds. Misses were extremely hard to spot. It took 22 mils of elevation at that distance. First round hit at 1950. After about 55 rounds it was dirty enough to increase the pressure so much that the bullets over spun and came apart in flight. I’m using an 8tw barrel so I’m roughly 297,000 revs. Quick clean and it was shooting lights out again. During load development I ended with a 1” group at 400.
Impressive. What do you think your barrel life is going to be? If not the greatest it would still make one hell of a long range elk hunting rifle.
 
I've been getting decent results with the Proof SS barrels. Curious to hear how the ModBB holds up to see if it is worth the extra coin.
 
There are cheaper options ;) LOL.. but you're talking quality.. so, yup $$$$$$$

True that. Some of the cost was the Mod BB, I had to have it recontoured, then fluted to meet light ELR weight. I've ordered up my next barrel direct so I've got the contour right and no fluting.
 
True that. Some of the cost was the Mod BB, I had to have it recontoured, then fluted to meet light ELR weight. I've ordered up my next barrel direct so I've got the contour right and no fluting.
I was thinking of the
33xc - Barrel Bartlein – MTU taper . 34” barrel length, with the 5R , 1/8 rifling, waiting for $$ to put my order in and wait 9 months :(
but, quality takes time with the demand.

 
Bartlein modBB 1.350 blank should be $710-$750 depending on length. Chamber and muzzle thread $500-$600, 600-800 rounds out of barrel, yeah adds up quick. Pay to play
 
Does BB have a 33XC reamer; so a person can pay to have them do it.. and are the reamers pretty standard? I thought I read about a few variables in reamers. The variances might of been from the early days.. but. never hurts to ask
 
I'm liking my current 32" barrel length. When I get my 33 cal barrel it will be a straight 1.25" 8 tw 32" finished length. I will look into the available options and see what will fit my budget.
 
  • Like
Reactions: wildcats
For 33xc shooters, how did you determine the seating depth without testing too many rounds and how often do you adjust the seating depth? I noticed that even if I find a good node, it doesn't seem to last long since the barrel burns fast.
 
I see Badlands came out with a new Tipped bore rider (TBR) 338. Has anyone shot them yet?