not getting conistency or velocites, Nosler Brass

[Mc85]

so I was working up some loads for the 155 scenars out of some nosler brass I had around . I know nosler brass is heavier and uses less powder then say win brass to get the same vels.

I was using 44.8grs in win cases to get 2808fps.
I tried 43.5 in the nosler brass and got a mixed 2800 to 2750...
Went up to 43.8 and got 2780 to 2750....
then tried 43.1 and got 2722 2761 2765 2768.
Idk if I am still over the OCW with the nosler, or whats up.
Any ideas????

Thanks

 

[Rob01]

Re: not getting conistency or velocites, Nosler Brass

New brass or fireformed?

 

[shadow4]

Re: not getting conistency or velocites, Nosler Brass

If I shoot my lapua brass I have to back off about .5 to .6 grains to get the same velocity with a load that I worked up using hornady match brass. So I would try around 44.3. But there could still be some issues with your brass as well, but its worth a shot.

I've also found that I get slower velocities with virgin brass. You use up some of the pressure fire-forming the case.

 

[Victor N TN]

Re: not getting conistency or velocites, Nosler Brass

I would use another chronograph and try again. Seldom does an increase in powder result in a decrease in muzzle velocity. I would suspect a lot of other things before I questioned the brass.

But that's just me.

 

[Mc85]

Re: not getting conistency or velocites, Nosler Brass

The brass is used, between 4 and 7 loads on it.
Um when I tried going up with the powder load (43.8) ES was around 50fps and velocity (except for one round) didn't increase at all. It was acting like last week when I worked up a load in the win brass and went over the ocw.
I am not seeing any high pressure signs on the case at all though. Bolt lift is good, primers are good...
So idk ...

 

[Victor N TN]

Re: not getting conistency or velocites, Nosler Brass

What kind of chronogragh are you using?

 

[Mc85]

Re: not getting conistency or velocites, Nosler Brass

a chrony master Beta.... lol love that name ..... comes complete with a FU button .. seriously does it get any better than that lol

anyways in all seriousness it has seemed to be right on with all my other loads. Using it and Jbm I always seem to be within no more than .25 to.5 moa off all the way out to 700yds.

When I was using my winchester brass last week I got 2808 with 5fps sd and like 10ish es. that was with 44.8 grains varget. If I went up to 45+ grains velocity stopped increasing acuracy went away and my ES went up....

When I did a side by side a while ago using 168 a-max's
seated to the same depth in win brass and nosler brass with the same powder charge the nosler was 100fps fast than the win. Somthing interesting.., dont know if it helps.

Anyways Im at a loss here as to whats up ...

 

[sobrbiker883]

Re: not getting conistency or velocites, Nosler Brass

I get suspicous results with my Shooting Chrony Gamma all the time.
Last time out (Tuesday) it told me my FGMM clone 168 loads were going 2760 avg, but they shoot solid with FGMM and match JBM within a 1/4-1/2 minute when I use 2675.

Was it brightly sunny when you chrono'd? I think the AZ sun messes with my Gamma, as I've gotten better and more consistent results on cloudy days.

 

[Mc85]

Re: not getting conistency or velocites, Nosler Brass

um no it was later in the evening bout the normal time I shoot.
40 mins b4 dusk. though yesterday I tried a little earlier and got about the same results

 

[jrob300]

Re: not getting conistency or velocites, Nosler Brass

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: sobrbiker883</div><div class="ubbcode-body">I get suspicous results with my Shooting Chrony Gamma all the time.
I think the AZ sun messes with my Gamma, as I've gotten better and more consistent results on cloudy days. </div></div>

Ditto this. I've taken to putting up a shade to block direct sunshine from the windows on my chrony since my 300WM recorded 3300 fps from 72g RL22 behind 200g SMK's

More realistic now!

John

 

[Victor N TN]

Re: not getting conistency or velocites, Nosler Brass

I would use another chronograph and see how it goes. You probably don't want my opinion on Shooting Chronys. I've had my last 2. I sold one and gave the other to my brother.

 

[Blueboat]

Re: not getting conistency or velocites, Nosler Brass

I agree with Victor, I have seen this too many times with the Shooting Chronys.
Mike

 

[Mc85]

Re: not getting conistency or velocites, Nosler Brass

do u think as a test I could run something like my .22 over it and would be safe to assume if it reads correct with them it would be correct with the .308?

 

[Limbic]

Re: not getting conistency or velocites, Nosler Brass

I've had problems with neck tension on some of my nosler brass for my 260. I use a bushing die and I couldn't get the mouth of the case to have any sig tension at all. Bullets would fall in the brass. I went down a few bushings but ran out of bushings after .288. The die works fine for Lapua brass.

My 2cents. Probably not worth that.

 

[Mc85]

Re: not getting conistency or velocites, Nosler Brass

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Limbic</div><div class="ubbcode-body">I've had problems with neck tension on some of my nosler brass for my 260. I use a bushing die and I couldn't get the mouth of the case to have any sig tension at all. Bullets would fall in the brass. I went down a few bushings but ran out of bushings after .288. The die works fine for Lapua brass.

My 2cents. Probably not worth that. </div></div>

Seems to me like the nosler brass doesn't like to form as easy.
seems like I did have some pretty inconsitent vels when I was using it b4 I got the win cases. Its weird cause the nosler doesn't vary more than a grain weight wise where as the win stuff can be one or 2 grains atleast and so far I've had better ES and SD with the win brass with no real accuracy prep. I just size trim and load. dont worry bout flash holes or weight sorting or neck turning or anything.

 

[Downzero]

Re: not getting conistency or velocites, Nosler Brass

What powder are you using?

If you're shooting a 24" .308, your velocities are all too low and you need more of it, whatever it is. You should be able to get 2900 or more.

I've not worked my load up beyond 2900, but the book max got me 2900 FPS with Varget.

If you're unable to get 2900 FPS from a 24" barrel with 155 Scenars in .308, either your charge is too low or you're using the wrong powder. I suspect that your charge is just too low...because as pressures go up, consistency tends to as well.

 

[kombayotch]

Re: not getting conistency or velocites, Nosler Brass

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Mc</div><div class="ubbcode-body">The brass is used, between 4 and 7 loads on it.</div></div>

I start seeing inconsistencies after about the 5th firing, so I anneal after the 4th. If you are measuring runout, you will notice them creeping up as the necks start to harden. That's a good sign that they need to be tickled with the torch again...

Make sure your necks are clean too.

 

[Mc85]

Re: not getting conistency or velocites, Nosler Brass

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Downzero</div><div class="ubbcode-body">What powder are you using?

If you're shooting a 24" .308, your velocities are all too low and you need more of it, whatever it is. You should be able to get 2900 or more.

I've not worked my load up beyond 2900, but the book max got me 2900 FPS with Varget.

If you're unable to get 2900 FPS from a 24" barrel with 155 Scenars in .308, either your charge is too low or you're using the wrong powder. I suspect that your charge is just too low...because as pressures go up, consistency tends to as well. </div></div>

Im using Varget and 44.8 grains of it with win brass and get 2800ish avg. With the OAL at 2.820 . When I got to 45.2 grains velocity quit increasing, SD and ES went way up and accuracy went south. As soon as I dropped back down to 44.8 velocity went back up and stabilized. Accuracy came back as well.
Im really at a loss. I was told on here by some of the members I was over the OCW for my gun.
With the nosler brass best I vould get was about 2750fps and SD and ES were pretty crappy.

 

[Downzero]

Re: not getting conistency or velocites, Nosler Brass

2800 FPS is too slow to get the real benefit of using a 155 grain bullet. You need to keep working up to the next accuracy node.

I am using 47 grains of Varget in LC (and I'm confident that I can go higher yet). Your load is really light.