New brass v. once fired?

[300 RUM]

Will new brass shoot as well as once fired?

 

[effendude]

Depends

 

[300 RUM]

Depends

Can you explain?

 

[effendude]

I was poking a little fun at your question. I mean no disrespect, it is just that your question was so general, I couldn't resist. I have had great luck shooting new brass that I simply prepped by chamfering the case mouth. Other times, the best accuracy is achieved with fireformed brass.

It depends on what level of accuracy you are striving for. My magnum hunting rifles shoot very well (for hunting purposes, .5 MOA or so) with new brass right from the box. Some of my hunting rifles have custom chambers, some have factory chambers. My custom match rifles shoot well with new brass, even with wildcats that need true fireforming, but they shine when the brass is a better fit to the chamber.

I have seen reloaded ammo that is less accurate than the original new brass due to poor reloading procedures or equipment.

Good luck with whatever you are doing,
Scott

 

[300 RUM]

oh I'm a smart ass too

the reason I ask is I need 200 rounds4 upcoming weekend of competition 1 match on saturday 1 match on sunday I'm too far from home to reload in between

I have plenty of new brass however I wanted to load 100 new in 100 once fired without seeing a major change between older and newer

 

[effendude]

What type of match? And what distances?

 

[TonyR]

As has been said, it depends. My 284 Shehane firing forming load was match quality but down one velocity node. With my 308 Win, the second firing gave better ES/SD and concentricity which did show up on the target. It really depends on the brass you start with and how and where it moves when you fire it the first time.

 

[XTR]

What type of match? And what distances?

This

 

[watercam]

Everyone has to shoot new brass in a match at one point or another. Prep it the best you can and know you might lose a point or two because you are fireforming your brass. For a standard cartridge with good brass to start with I'll bet you are within 95% of your accuracy potential.

 

[Nomad47]

I may be all wet in my thinking, but the brass instantly swells to fit the chamber. So velocity wise, there should be no difference between new and once fired brass. However, concentricity and other issues should improve with once fired brass.

 

[markm87]

Depends

Indeed.

 

[300 RUM]

What type of match? And what distances?

It will be a F t/r Saturday 1,000 yard Sunday 600 yard

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Nomad47: You think the Velocities will be the same? I guess that Is what i'm thinking to be my largest concern.

 

[Nomad47]

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Nomad47: You think the Velocities will be the same? I guess that Is what i'm thinking to be my largest concern.
[/quote]

A few days ago, I shot two three shot groups in my 284 Win. One group was new brass and one was once fired. The average velocities were 2 fps apart.

 

[DBailey]

I've seen a 30 fps average velocity change between new and once fired brass from my 7mm open gun, once fired being the faster.

Use the fired brass at 1000 and the new brass at 600 and you'll be fine.

 

[Erik Cortina]

I may be all wet in my thinking, but the brass instantly swells to fit the chamber. So velocity wise, there should be no difference between new and once fired brass. However, concentricity and other issues should improve with once fired brass.

This has to do more with your headspace than with the brass. So, if your headspace is really close on your brass, velocities might be close, but I have seen them be quite a bit off.

I've seen a 30 fps average velocity change between new and once fired brass from my 7mm open gun, once fired being the faster.

Use the fired brass at 1000 and the new brass at 600 and you'll be fine.

This is as good advice as any. Good luck.

 

[300 RUM]

I may be all wet in my thinking, but the brass instantly swells to fit the chamber. So velocity wise, there should be no difference between new and once fired brass. However, concentricity and other issues should improve with once fired brass.

This has to do more with your headspace than with the brass. So, if your headspace is really close on your brass, velocities might be close, but I have seen them be quite a bit off.

I've seen a 30 fps average velocity change between new and once fired brass from my 7mm open gun, once fired being the faster.

Use the fired brass at 1000 and the new brass at 600 and you'll be fine.

This is as good advice as any. Good luck.

Head space is .0015

 

[Erik Cortina]

Sounds close enough. If it's only .0015", I would bump once fired brass back to match virgin brass and you should be good to go.

But folow Bailey's advise also.

 

[300 RUM]

Yes, indeed about following Bailey's advice. Normally I would not of even been concerned, in mild weather I would be able to see a rise in POI. I'm just preparing for high winds, it is that time of the year.