30 br primers ?

[Link]

After the post about neck tension and jam trying to get a better burn.

Wouldn't you use a primer with more bang?

What is the primer of choice?

thanks Link

Another thing I'm using 34.4 of H4198, 115 Bergers and wolf primers with a lil jump. And have gone up as high as 34.7 with no improvement, is there a higher node that I'm missing?

 

[GSPV]

You can look through the equipment sheets in the shoot reports here http://internationalbenchrest.com/results/score/_scoreindex.php .

I shoot 205Ms.

 

[chris30br]

If you are not getting pressure signs. Go on up in powder. I have been shooting 35.8 with no problem all year
Work up slow. Every barrel is different. The barrel I shot last year would show pressure by bolt lift at 35 gr. Hope this helps.

 

[tenring]

Wish I could pack 35.8 in a case. I stay around 34.5. Just switched from Fed 205 Match primers to CCI BR4. Quite an improvement.

 

[Judd]

Me too tenring...I used Fed205's...sounds like I need to pull some BR4's out and give them a try.

Chris....are you blowing primer pockets out?? I haven't tried to find pressure just because my experience with ruining 6br cases in my straight 6br running them too hot.

 

[chris30br]

I have not blown any primers as of yet and pockets are still good and tight. Have not ran the load over a meter. I did work around the 34.5 area for awhile and it had alot of vertical so I kept working up till vertical was gone.

 

[Link]

Thanks for the info.

A lot of shooters use H. and 205s.

I wish I was a better tuner.

Link

 

[GSPV]

A bud who is a PhD chemist did a LOT of stats. In his rifle and loads, which I now own, the BR4s showed significantly better velocity SD.

I guess I've got to pick up some BR4s too.

 

[the long shot]

Go to Fed 205s and go from jump to Jam 0 to Jam 10 thousands. I am Jamming 10 and using 33.5 grains with 118s.

 

[GSPV]

Lots of good info in this thread by Al Nyhus on 30 BR tuning:

http://forum.accurateshooter.com/index.php?topic=3789308.msg36084639#msg36084639

 

[superlight93]

After the post about neck tension and jam trying to get a better burn.

Wouldn't you use a primer with more bang?

What is the primer of choice?

thanks Link

Another thing I'm using 34.4 of H4198, 115 Bergers and wolf primers with a lil jump. And have gone up as high as 34.7 with no improvement, is there a higher node that I'm missing?

34.8 - 35.0 H4198. Jam hard into lands at least 20 thousands. Try both a 323 and 324 sizing bushing. You will see a difference in accuracy. Have Fun!

 

[Link]

I have about .0025 of grip on my tension. That should be ok?

Another thing I wonder about is I have about .040+ of bullet shank in the neck at lil square marks of jam. ?

I have loaded 34.8 and 35.0 gr of H4198, 205s, 115 Berger's and am going to the range.

Rifle is a Rem XR100 with a hart 18t barrel and T36.

thanks again. I will be back for more help. I know I will.

 

[RGRobinett]

I have about .0025 of grip on my tension. That should be ok?

Another thing I wonder about is I have about .040+ of bullet shank in the neck at lil square marks of jam. ?

I have loaded 34.8 and 35.0 gr of H4198, 205s, 115 Berger's and am going to the range.

Rifle is a Rem XR100 with a hart 18t barrel and T36.

thanks again. I will be back for more help. I know I will.

This - highlighted in RED - implies excessive free-bore, which has proven to be difficult, but, not impossible to overcome. With the Berger 115, and ZERO free-bore, and a 1.5 degree throat angle, at land contact, the bullet base should be about 0.150" into the neck, or, about 1/2 way to the shoulder/neck junction. It appears that your situation precludes more "jam".

That said, with thirty BRs, and light bullets, with H-4198, more "neck-tension" almost always works better: a NK bushing 0.004-0.005" smaller than the loaded neck-diameter will promote consistent ignition, as will CCI BR4 primers. While some 30 BR chambered barrels will prefer a "jump", and/or, lighter "neck-tension", a vast majority will, "come to life" with MORE of both. Look up Al Nyhus' advice and follow it - to the letter. Keep 'em ON the X! RG

 

[GSPV]

Randy, due you mean both more neck tension and more jam?

 

[RGRobinett]

Randy, due you mean both more neck tension and more jam?

Yes, in many barrels, I have seen this combination, take things from 'iffy' to, "killer good". RG

 

[Link]

Loaded up to 35.0 and the bolt lift was about the same as with 34.4, a little stiff.
The loads chamber nice and I bump every reload but maybe I should bump a little more? The face of the head gets a little smear on extraction. The primers look ok. The group did tighten a little.

Thanks Gentlemen.

 

[Tim Singleton]

Are you shooting over a chronograph?
I had some good instruction from a custom bullet maker. I think you will find this to work. For most 30br and for mine as well a good accuracy node is just over 3000 fps say 3030 as a target velocity with the 115-118 You can probably get there with less powder than you are using and increasing jam.

I understand your chamber may have to long freebore to be able to jam them. If so you might consider setting it back and re chambering

33.4 gr H4198 jammed .015" in my 24" barrel gets it done.
For me jumping I had to add more powder as i backed the bullet out to get the desired velocity.