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bullets that have potential, most are flat base...what do you think?
125 SMK
125 TMK
125 SST
125 NBT-boat tail
125 Accubond-boat tail
135 SMK-boat tail
110 TTSX
110 TSX
130 TSX
110 Vmax
I have some 150gr Hornady flat base bullets that fit this cartridge like they were made for it. I do have some Nosler 125gr BT's I want to try being I have lots of 1680.
 
Im not what the difference is between this one and the 30 American is but the Hornady 125 gr sst's would not work . They are too long to fit in the mag and maintain proper seating depth.
 
Congrats on your barrel. I just came across some 1680. Seems to be a good powder for this round. I'm looking to get 2500fps with a 150gr bullet. 1680 looks like my best option. If I only get to 2400fps that will be good. Yah it's a pretty barrel.
I should of mentioned it's from AR15performance.com. I will keep everybody up to date on the build and final performance of the caliber. As you can see I am fond Of this round.

 

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Im not what the difference is between this one and the 30 American is but the Hornady 125 gr sst's would not work . They are too long to fit in the mag and maintain proper seating depth.
Looking at the two, the 125gr SST and 150gr interlock look pretty close to being the same size with the 150 being just a little longer from the base to the ogive. The 125 is longer from the ogive to the tip. At 2.295 col, the ogive will be just forward of the case mouth. Then I looked at the 150gr SST. That bullet is way bigger than the 150gr interlock. The 150gr Nosler BT is a no go as well.

I think the 150gr interlock would give you a little more breathing room out front the case mouth but take away from powder capacity. I don't know the difference between the two cartridges either.



150 NOS BT 150 SST 150 Interlock and 125 SST
 
Im not what the difference is between this one and the 30 American is but the Hornady 125 gr sst's would not work . They are too long to fit in the mag and maintain proper seating depth.
The American 30 is similar in nature to the 30 Herrett, 30 HRT and now the 30 Herrett AR. They all use the old 30 Herrett reloading dies, but with some small adjustments in die seating. Also the original 30 Herrett head spaces on the shoulder unlike the others to get optimum accuracy.

Max Case lengths:
American 30 1.610
30 Herrett 1.605
30 HRT 1.600
30 Herrett AR 1.580

All utilize 6.8 SPC or 30 Remington Brass and 6.8 AR bolts with Magazines.
 
Discussion starter · #26 ·
The American 30 is similar in nature to the 30 Herrett, 30 HRT and now the 30 Herrett AR. They all use the old 30 Herrett reloading dies, but with some small adjustments in die seating. Also the original 30 Herrett head spaces on the shoulder unlike the others to get optimum accuracy.

Max Case lengths:
American 30 1.610
30 Herrett 1.605
30 HRT 1.600
30 Herrett AR 1.580

All utilize 6.8 SPC or 30 Remington Brass and 6.8 AR bolts with Magazines.
The original 30 Herrett was a rimmed cartridge made for the TC Contender. It headspaced on the Rim.
I called this the 30 Herrett AR to tie it to the 30 Herrett dies but it is rimless and runs at a much higher pressure in the AR.
I shortened the necks so longer bullets could be used when loaded correctly.
 
The original 30 Herrett was a rimmed cartridge made for the TC Contender. It headspaced on the Rim.
I called this the 30 Herrett AR to tie it to the 30 Herrett dies but it is rimless and runs at a much higher pressure in the AR.
I shortened the necks so longer bullets could be used when loaded correctly.
The Barrel I have a picture of was just delivered To Canada by you so I will not disagree with you on the HRT and AR versions as I am new to the breeds, however as a long time shooter of the original TC version I have extensive knowledge of it. You are correct as it was a rimmed version based on the 30 30 Winchester brass, necked down and cut to 1.605 max length. It was to be fire formed as the dies could not give it the pronounced 30 deg of angle that was required for accuracy. This was due to the need of head spacing on the shoulder and not the rim. The breach spacing also required 1 to 2 thousands to allow a tight fit to the shoulder. Once fire formed the dies needed to be back up ever so slightly to avoid any future contact with the sizing die to maintain the fire forming.

Also of note I can also shoot 30 HRT in my TC even without the rim.

I have attached a couple of pictures showing two 30 Herrett rounds where the left brass cartridge has the fireformed shoulder and the right nickel cartridge pre fire formed. The second picture is of a 6.8 brass next to one resized before trimming. The next two are a new Horandy 6.8 SPC beside a 30 HRT, next to a 30 Herrett, then a 7.62 39 and 5.56 for comparison.
 

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Discussion starter · #30 ·
This is your quote right?
"Also the original 30 Herrett head spaces on the shoulder unlike the others to get optimum accuracy."
Rimless cartridges headspace on the shoulder. You said the rimmed headspaced on the shoulder and the rimless did not.

I've always tried to set the shoulder of every case .002-.004 under the chamber size rimmed, belted or rimless so the case isn't sloppy in the chamber. From the factory the Herrett is a rimmed cartridge which headspaces on the rim. The rest are rimless that headspaces on the shoulder.

The 30 Herrett, 30 HRT and 30 Herrett AR all use the original 30 Herrett dies and length to the shoulder. They are all close in OAL to allow using longer bullets. I made the "AR" a little shorter to allow using longer bullets. I can shoot the 155 Amax out of it. The 30 American shoulder is forward of the rest and the case OAL is longer than the rest.
 
This is your quote right?
"Also the original 30 Herrett head spaces on the shoulder unlike the others to get optimum accuracy."
Rimless cartridges headspace on the shoulder. You said the rimmed headspaced on the shoulder and the rimless did not.

I've always tried to set the shoulder of every case .002-.004 under the chamber size rimmed, belted or rimless so the case isn't sloppy in the chamber. From the factory the Herrett is a rimmed cartridge which headspaces on the rim. The rest are rimless that headspaces on the shoulder.

The 30 Herrett, 30 HRT and 30 Herrett AR all use the original 30 Herrett dies and length to the shoulder. They are all close in OAL to allow using longer bullets. I made the "AR" a little shorter to allow using longer bullets. I can shoot the 155 Amax out of it. The 30 American shoulder is forward of the rest and the case OAL is longer than the rest.
Yes that is my quote, but as mentioned forgive my ignorance to the new AR cartridges as they are new toys for me and I can not dispute you knowledge. That being said I do know how the TC version works and it is different to other rimmed cartridges.
 
I did shoot the 150gr SST with the bullet set to 2.305. it was a tight fit but can work. With the powders I had the base took up to much room to get any speed. Now I do have LilGun. May be worth a try. I have some 150gr Remington FB Corloks and 140gr FB Nosler CC's coming this week. Curious to see how they fit this cartridge. I have some 125gr Sierra TMK's. They are way to long from the ogive to the tip to be loaded correctly. The SMK's may be a different story? I don't have any to look at, at the moment.
 
I did shoot the 150gr SST with the bullet set to 2.305. it was a tight fit but can work. With the powders I had the base took up to much room to get any speed. Now I do have LilGun. May be worth a try. I have some 150gr Remington FB Corloks and 140gr FB Nosler CC's coming this week. Curious to see how they fit this cartridge. I have some 125gr Sierra TMK's. They are way to long from the ogive to the tip to be loaded correctly. The SMK's may be a different story? I don't have any to look at, at the moment.
I have some of the 125gr SMK bullets; they are too long for the 30 Herrett AR (30 HAR? harharharhar :a16:), the nose profile was designed for the 300 BLK which is considerably shorter. The 125gr TNT seems to be just about right though.
 


150gr Hornady interlock, 150gr Rem Core-lokt, 140gr Nosler CC and 125gr Hornady SST

The 150gr Core-lokt! If I knew these came in a blue Midway box I would have never bought them. These are blems. I wish Midway would state this. These bullets vary so much from bullet to bullet it's not funny. But so far these bullets look to be the best fit for the 150gr bullet. It looks like I can get another grain of LT-30 behind the bullet to run over 2400fps pretty easy and stay around 2.295 col. Need to try 1680 also and see what I can do with that powder.

The 140gr Nosler CC was a bit of a disappointment. The ogive is set way to far forward and the base will take up to much room for powder. May work Ok with 1680?
 
How about compiling a collective list of nose length measurements for different bullets that might fit the 30 Herrett AR? I'm sure a number of you have made these measurements on your own, but I haven't seen a list published anywhere.

A normal "ogive" measurement to the .300" diameter on the bullet nose doesn't tell the whole story, I propose measuring to the full diameter if a distinct line is visible (like many Hornady bullets), and to a .306" diameter point if not. The .306" diameter can be marked by locking your calipers at .306" and pressing the bullet nose lightly between the jaws while rolling it. Alternatively, the full diameter can be marked by rolling the bullet between a piece of glass and a file, to knurl it.

With a case length of 1.580" and mag length of 2.300", that leaves .720" for nose length. (As H has pointed out, preferably the nose is shorter, allowing some portion of the full diameter outside the case neck.)

I'll start with a few I have on hand (rounded to the nearest .005" for measurement error):

125 SMK - 0.765"
125 Nosler BT - 0.710"
150 Nosler BT - 0.720"
125 Speer TNT - 0.665"
110 Sierra HP - 0.485"
130 Barnes XLC - 0.635" (discontinued, is the TSX similar?)
150 Rem CL (I think) - 0.660"

I think those are all I have for now...
 
Has anyone tried Shooters World black out powder with the 125grs.? It looks like it would be a great choice for the Herrit and is in line with the 7.62x39.
 
30 Herrett AR - load data

Has anyone tried Shooters World black out powder with the 125grs.? It looks like it would be a great choice for the Herrit and is in line with the 7.62x39.
Tested my ARP 30 Herrett AR:
Using Cavity Back 125 MKZ loaded over Shooters World Blackout, CCI450, 2.280" oal, in neck turned SSA fire formed brass.
The Cavity Back 125 MKZ hits the lands in my barrel at 2.285", so loading .005" off the lands..
Oehler 35P chrono.
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Blackout Avg
_______fps_ E.S. S.D.
27.8 gr 2576 67 34.
28.1 gr 2591 20 10.
28.4 gr 2635 32 16.
28.7 gr 2645 21 11.
29.0 gr 2658fps 17es 8sd...
-
There is more room available beyond the 29.0 load, but this load gave the best accuracy and no swipes or ejector stamps on my brass.
The 29.0 load of blackout is my current hog hunting load in my ARP 30 Herrett AR.

Dennis
 
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