Speaking about brass...

[Intercooler]

     Ahh. The picture is a little clearer even more. The only splits I ever had in 10mm were with brand new Armscor cases (BVAC) ammo. Possibly double trouble there!

[DM1906]

......The brass being shown is Armscor, others also had some issues using this brass as it became very plastic like under the pressures.

I had a very similar experience with what I believe was Armscor brass.  The supplier (DT) refused to say where the brass was sourced, but did say it was "the only batch of brass they strayed from Starline".  He replaced all the brass I bought (plus some) with their "good" stuff, and paid return shipping.  My post (over a year ago, with pics) is earlier in the same thread.  I've also had issues with Armscor brass in other calibers over the years.

[blastfact]

I just checked some of my *-* and Win 10mm brass shot out of my LW 5.25" barrel. All .420 at the mouth and .425 above the extractor groove. Just like the chamber measurement. I have to do a quick one time dressing of new brass case mouth with a cheap Lee tool or they won't feed right.

I have not shot one round through the Glock Gen3 OEM barrel. It's as sloppy as a $2.00 whore.

[Intercooler]

Were these upper end loads or tamed down when you measured?

[blastfact]

Were these upper end loads or tamed down when you measured?

Intercooler

Mine where well above book, XTP's screaming and hitting like a rhino. I have chrony info on them I just have to look it up,,,, sorry it's not on my puter. There were 155, 180 and 200gn XTP's getting stupid. And my target was some 5lb defective step down transformers setting on 2"x2" bean poles (ash) The 10mm loads where only bested by hot .41 mag loads. My way hot .357 H-110 loads only beat the the 10mm loads at distance thrown at 125/135gn loads. Those fast nosler 135gn bullets are useless. They really are useless, 135gn they should pay us to load them. There even more useless than 185gn .45 acp or Gap.

[Intercooler]

That's tight then. When you talk about trimming the brass I wonder if that's why I get the little shavings out of the Razorback? It' really tight... maybe too much in a way.

[blastfact]

That's tight then. When you talk about trimming the brass I wonder if that's why I get the little shavings out of the Razorback? It' really tight... maybe too much in a way.

Intercooler

I don't trim my new 10mm brass. I chamfer / bevel the inside and outside edges of the case mouth. Honestly it's more like deburring. If I don't do this I have feeding issues. Once done the brass feeds great from then on.

I also detailed the barrel inside and out. It shoots great. Cleans up very easy. And has bling inside and outside. 

[Intercooler]

   Performed the test on the EAA Limited Pro today using Underwood 180gr TMJ.

.420"-.429", .420"-.428", .420"-.428", .420"-.430", .419"-.429". Average = .0088"

[The_Shadow]

Using JAG Brass I loaded 10mm rounds put together with Hornady 200 grain XTP's...sent these to Intercooler for testing.  These had been pass through sized.  This is also the second firing.
Hornady 200 grain XTP one each of the following; He sent the brass back to me for further study.

Here are e results with expansion measurements at the widest measurement

9.4 grains IMR800X - matches Underwood loading 1250 fps  actual 1216 FPS/ 657 LBS.
0.4310" primer slight wipe OK, case mouth has a wipe mark

9.4 grains LongShot - matches Swamp Fox's loading 1240 fps  actual 1256 FPS/ 701 LBS.
0.4330" primers slight flatten some wipe OK

10.5grains Blue Dot - matches my load I use 1200 fps  actual 1138 FPS/ 575 LBS.
0.4310" primer slight wipe OK

8.4 grains Power Pistol - matches my load 1235 fps  actual 1195 FPS/ 634 LBS.
0.4310" primer slight wipe OK case mouth has a tiny wipe mark

12.6grains AA #9 - matches Accurate Arms book load 12.5 1170 fps 37,000 psi  actual 1130 FPS/ 567 LBS.  0.4320" primer slight wipe OK

13.0grains AA #9 - Above Accurate Arms book load 12.5 1170 fps 37,000 psi (2 Winchester Brass) 1129, 1165. Average = 1147 FPS/ 584 LBS.  both  @ 0.4330" primers flattened some wipe

RCBS 200 grain cast TCBB (SWC)  made 3 of these with my cast bullets
10.0 grains Blue Dot – 1200 actual 1096, 1080, 1119. Average = 1098.33 FPS/ 536 LBS.   0.4305" / 0.4305" / 0.4305" primer  very slight wipe OK

Here are two Double Tap factory loaded cases for comparison.
DT 180 Noslers 9.0 grains of  LongShot 1305fps  actual 1077 FPS/ 464 LBS.  0.4315" primer very slight wipe OK
DT 165 Noslers 9.6 grains of  LongShot 1425fps  actual 1303 FPS/ 622 LBS.  0.4335" primer slight wipe OK


Judging from these results, I see this JAG brass as a very viable option for handloaders and reuse...

[BigD63]

That's tight then. When you talk about trimming the brass I wonder if that's why I get the little shavings out of the Razorback? It' really tight... maybe too much in a way.

Intercooler

I don't trim my new 10mm brass. I chamfer / bevel the inside and outside edges of the case mouth. Honestly it's more like deburring. If I don't do this I have feeding issues. Once done the brass feeds great from then on.

I also detailed the barrel inside and out. It shoots great. Cleans up very easy. And has bling inside and outside. 

I realize this post has been up for some time now however If anyone would like to ring in on this I would greatly appreciate the info...first, when you say feeding issues are you reffering to feeding in the reloading press or the firearm? Second, I have many nickel, supposedly once fired cases that are below the maximum trim to length...are these cases ok to reload? I have loaded some of them that were close to the trim to length and have had no real issues other than some feeding issues in the firearm thus my concern with the chamfer / bevel procedure...thank you for any insight on this topic!

[The_Shadow]

BigD63, Hello and welcome to the forum!
Most of the new casings can have some edges from the machining process, this should be cleaned up so.  Why as you are loading it can snag the bullet material when seating (especially plated bullets and cast), this material can be dragged inside the casing causing a bump inside or even roll up along the case mouth, which it can cause headspacing issues.  The burr removal helps tremendously not only for smoother handloading operations at the taper crimp station it does add to better feed and cycling in the firearm as well.

Most straight walled casings (10mm included) do not need trimming.   Their lengths can vary during production runs and from different makers.  If you read through the "Pull-Dow" section here you will find various lengths as found in ammo production runs.

Best regards!

[10mm-Admirer]

I bought a bag of 100 pieces of JAG brass at Cabelas tonight packaged as Team Never Quit brand.  It looks really well made and was $3 cheaper than the bag of Starline 10mm brass hanging next it.