Can different brass cause different pressure?

[Lrreloader]

As the title states wondering if different manufacturers brass can vary pressure with same powder charge? 33 nosler is limited to nosler brass ( which I have ) and hornady brass. I just seen where Peterson offers brass for the 33 now. The nosler I got was not cheap and either is the Peterson but I seem the be getting pressure sooner than expected with the Nosler brass. Is it worth trying another brass right away or try a few different powders?

 

[jebel]

Yes, different brass will show pressure at different charges. It's from either/both different hardness or different thickness. I would encourage you to think in terms of velocities, not charge quantities. Thicker, harder brass might reach the same velocity as a thinner brand with a lesser charge than the thinner brand.

 

[Lrreloader]

Yes, different brass will show pressure at different charges. It's from either/both different hardness or different thickness. I would encourage you to think in terms of velocities, not charge quantities. Thicker, harder brass might reach the same velocity as a thinner brand with a lesser charge than the thinner brand.

I am trying to get to a certain velocity, I run into pressure before lack of case capacity. So I was considering trying different brass to help aid in getting to the fps I am after

 

[BW64]

I found Peterson brass in my 6.5cm to be heavier & require less charge but I also had less velocity than other brass. It's good brass & last many firings.

 

[DUSTY NOGGIN]

did you get that certain velocity out of the other brand or brass ???

 

[Lrreloader]

I found Peterson brass in my 6.5cm to be heavier & require less charge but I also had less velocity than other brass. It's good brass & last many firings.

That's the answer I was looking for should have asked the question differently, such as is Peterson brass slower than nosler?
Thanks I guess I will stick with nosler and keep experimenting with powders and then maby primers

 

[DUSTY NOGGIN]

if the nosler brass is a little over sized on the shoulder .. new brass usually is

the ejector plunger will push it forward inoi the chamber shoulder and give chamber clearance gap .. too large of chamber clearance gap can slam back and give that ejectot impression at al lessor charge

if you can fire form your brass first with some lighter charges, then you can size so that you get a nice crush fit .. you can get to a higher charge if yiu case fits the chamber perfectly ..

also make sure you are cleaning off all lube

 

[Lrreloader]

if the nosler brass is a little over sized on the shoulder ..

the ejector plunger will push it forward inoi the chamber shoulder and give chamber gap .. too large of chamber clearance gap can slam back and give that ejectot impression ..

if you can fire form your brass first with some lighter charges, then you can size so that you get a crush fit .. you can get to a higher charge if yiu case fits the chamber perfectly ..

also make sure you are cleaning off all lube

I have shoulders bumped .004 from 1st firing

 

[Shane Lindsey]

Don't fall in love with velocities you think you should get. Go with safe and accurate.

I have read how fast folks are pushing certain cartridges and have not been able to replicate with what I feel is safe based on reading the pressure signs. Too many variables- barrel tightness, chamber specs, components. I want a hot rod, that is why I reload, but the current times have made me step back and think about my components or more importantly the inability to get more when I torch the ones I have trying to eek out that last bit. Has me thinking, maybe that low node ain't so bad...

 

[Lrreloader]

There is no lack of components here, I will settle on safe velocity but just trying to get all I can without pushing the safety limits, new rifle and little reload data out there for the 33 nosler

 

[Shane Lindsey]

If seeing pressure signs on virgin cases, velocity/pressure will likely increase with once fired and probably be over pressure.

As mentioned you could fire form with less and see of you can work it up, but I have found if working up in virgin cases, a drop of 1/2 to 1 gr may be needed to get same velocity/ pressure as virgin cases. This is of course working at or close to max.

 

[DUSTY NOGGIN]

if its at pressure its at pressure .. agreed with above "This is of course working at or close to max."

but if you think ut false preasure aigns

getting rid of as much of the chamber clearance as possble ..

jump bullet as much as accurancy allows

brass side wall to chamber grip by spinning brass in some steelwool or similar will get rid of any leftover lube as well

 

[Lrreloader]

If seeing pressure signs on virgin cases, velocity/pressure will likely increase with once fired and probably be over pressure.

As mentioned you could fire form with less and see of you can work it up, but I have found if working up in virgin cases, a drop of 1/2 to 1 gr may be needed to get same velocity/ pressure as virgin cases. This is of course working at or close to max.

They have been fired once with low loads just for barrel break in purposes and bumped back .004 from chamber size

 

[Shane Lindsey]

Did the virgin cases have pressure signs on the light loads? If so, could be other issues.

I had a 300 RUM that pressured at start book charge weights. Chalked it ip to a tight bore. Had to shoot lighter pills.

Would this be a Christensen barrel?