Changing Brass - Interesting

[bullet]

I decided to change brass on one of my 300Win Mag loads and see what the difference would turn out to be when using my 165gr Sierra HPBT. I was using Winchester brass but the last bag I bought was not a good batch and I was disappointed in the quality. So I bought some Remington brass. I really like this brass. So I did my usual annal retentive stuff every time I load rounds. I used the same load chain 165gr HPBT, CCI250 primers, IMR4350 except for the brass. With the Winchester the velocities were 3218fps and with the Remington the velocities were 3182fps. The accuracy was pretty much the same. I did have less expansion at the base of the bullet using Remington brass.

These two five shot groups are all but identical in size. The group shot with the Remington brass was shot with the first and last round from a completely cooled barrel. Folks kept coming up and talking to me at the range and so my intervals between shots using the Remington brass were not consistent like when I shot the five shot group using the Winchester brass.


165gr Sierra HPBT Game King, five shot group Winchester Brass, CCI250 primers and IMR4350, moving 3182fps

165gr Sierra HPBT Game King, five shot group Remington Brass, CCI250 primers and IMR4350, moving 3182fps Extreme Spread 11.75fps Deviation was 5.47 much better than the Win brass

 

[DrMike]

Mike,

Was the standard deviation similar on the two loads? I'm just wondering if they fall into the same confidence level.

 

[bullet]

Mike,

Was the standard deviation similar on the two loads? I'm just wondering if they fall into the same confidence level.

Much better with the Remington brass - Extreme spread was 11.75 and Deviation was 5.47

 

[bullet]

Weighed the fired brass from those five shot groups and the average for each is: Remington was 241.1grs and Winchester was 241.8grs

 

[DrMike]

I'll guess there is a difference in case capacity. Interesting. I don't usually spend a lot of time measuring differences in case capacity, but I am aware of differences. This compels me to work with the same lots of brass throughout the life of a cartridge. As always, interesting stuff, Mike.

 

[JD338]

The weight difference in the brass translates to internal case capacity and it varies sometimes quite a bit from manufacture.
Pretty interesting results Mike.

JD338

 

[bullet]

Here is a better shot of the target to show just how well my rifle shot this load.

 

[Antelope_Sniper]

Well, I'm pretty sure that Nosler brass is made by the same people as Remington brass.....so what does that tell ya?

 

[C.Smith]

I thought Norma made Nosler brass?

Corey

 

[SJB358]

I thought Norma made Nosler brass?

Corey

Yeah, I thought Norma was making Nosler as well..

Great shooting Mike! Very darned awesome 300WM. Scotty

 

[bullet]

I thought Norma made Nosler brass?

Corey

Yeah, I thought Norma was making Nosler as well..

Great shooting Mike! Very darned awesome 300WM. Scotty

Yes, the out of box rifles of today are amazing indeed, especially this Savage 116FHSS in 300Win Mag :grin:

 

[SJB358]

Without a doubt Mike. Hard to go wrong with them. Seems like a perfect set up as well. Not much you can't handle with it, that is for sure. Scotty

 

[FOTIS]

Something to remember with SD fellas.

It is a measure of uniformity, that is all.

The load is self can be uniformly accurate or uniformly inaccurate. :wink:

 

[SJB358]

HA! I must be getting all the wrong SD's! Scotty

 

[efw]

The weight difference in the brass translates to internal case capacity and it varies sometimes quite a bit from manufacture.
Pretty interesting results Mike.

JD338

Yep slightly greater weight means slightly less internal volume which means slightly higher pressure and slightly higher velocity.

Very interesting indeed.

 

[C.Smith]

Sorry I forgot to mention that is a great shooting load/rifle

Corey

 

[BK]

I thought Norma made Nosler brass?

Corey

Yeah, I thought Norma was making Nosler as well..

Great shooting Mike! Very darned awesome 300WM. Scotty

I thought it was here, but one of my forums had information that Nosler has more than one manufacturer of their brass, depending on the caliber.