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New 30BR barrel work up

AlNyhus

Silver $$ Contributor
The winds finally settled to sub 15 mph today so I took advantage of it and did some load work on a new Bartlein twisted 1:17 and chambered in the .330 neck 30BR by 'Humble' Henry Rivers. With the by now boringly standard tuneup parameters of .003 neck clearance, a bushing .004 smaller than the neck with a bullet seated, seating depth of the bullet seated .030 longer than the T.P. (Touch Point), it tuned up per normal. Powder was H4198 (yawn), primers Fed 205M (double yawn) and my 117 bullets on the 1.00" jackets out of a new Blackmon die. :) Three shot groups showed goodness at 33.6, 34.2 and 35.1. As a control, I repeated the 34.2 with a 5 shot group. Winds were from 3-4 o'clock but you had to watch the far flag tail for a push that was worth a bullet out the left.

Next outing will be a seating depth check. If everything hangs in there, one of Mike Ezell's PDT 7 oz. tuner will go on when conditions cooperate. Thanks to 'Hiz Humbleness' for another great chamber and fitting and to Mike Ezell for doing the muzzle work for the tuner and working with me on that. Two of the good guys, for sure! :cool:
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On a related note, I once again noticed what I can only characterize as a bit of a phenomena with charges dispensed from my Chargemaster Link compared to the same relative charges thrown from my Redding powder measure. Lacking Hercule Poirot's moustasche, I'll have to go Frank Sinatra on it......do it my way.
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Paul, it's pretty hard to make these 30BR's  not shoot. With a known good reamer, the areas most people struggle with are:
1. Poor brass prep
2. Neck tension
3. Seating depth
4. Neck clearance (part of #1)
5. Bullet selection (also part of #1)

If you had to be real smart to get accuracy out of these things, I'd be out right away. :oops:
 
34.2 is about the middle. The .030 is from the T.P. (touch point) using the stripped bolt method when the rifling marks just disappear. Whatever the stem length is when I find the T.P., I record that for that particular bullet and seater stem. The .030 is how much shorter the seating stem is from what it measured at the TP. In other words, the bullet is seated .030 longer than the T.P.
 
I thought this was a gota have round, gota have a lot of powder, gota have a lot of jam, gota have a lot of neck tension. Here you come up with a middle of the road load that is great. How does it hold together at 200 or 300? asking for a friend. ;]
 
Link, I do use what some consider a 'lot'...whatever that is... of neck tension and jam-seat. But it really isn’t. When you look at how many run their PPC programs, the 30BR isn’t much different, if at all.

Any good 30BR will show multiple good accuracy nodes. Most will have at least two from down low to way up there. Many will show three such nodes. In between those nodes you'll see the vertical come in and go out as the powder charge goes up. That's the beauty of tuning a 30BR as outlined...you tune it with the powder measure. From there, you can back up the seating depth incrementally and see if there's anything there. And finally the neck tension. I don't particularly care how much powder I use or the velocity. I've won with loads in the mid 33's to the high 34's.

This method of tuning the 30BR has been around since it's inception over 25 years ago...it's nothing new. In fact, it's an offshoot of how succesful Hunter class shooters were tuning up the larger case .30's for a couple of decades. That's how I tuned mine before I ever had a 30BR.

Randy Robinett has written and described this process for a long, long, time now. I simply followed his advice with the Hunter stuff and then on to the 30BR's.

And there may be other methods and approaches to tuning these. This is just one that works. None of this is magic...just common sense and letting the target tell you what the gun is saying. The map is well drawn and it only requires that shooters follow the lines. :)
 
All that Al said. FWIW, my no-brainer load was 34.2 grs H4198 (if you can find some) and a BIB 118 10 ogive seated .012 into the rifling from my Stoney Point/Hornady seating depth measurement. It's probably real close to what Al is doing because of the difference in the starting point techniques. Primers didn't seem to matter too much; had great success with Rem 7 1/2, Fed 205M and Wolf SRM.
 
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