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30-378 case life

 
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  #8  
Old 06-24-2002, 03:27 AM
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Re: 30-378 case life

How about H870? Are ball powders in general better?
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  #9  
Old 06-24-2002, 06:40 AM
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Re: 30-378 case life

Len

For cold weather shooting, ball powders are much better especially H870 which is highly graphited.
It will give you MUCH better barrel life (up to 5X) and is a very accurate powder for the longrange hunter.

I use a comparable powder (WC872) in ALL my LR hunting guns. For HOT weather, it will give you an occasional flyer because it is a heat sinsitive powder.

Later
DC
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  #10  
Old 06-24-2002, 10:29 PM
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Re: 30-378 case life

Darryl,

I've tried several powders in the 7mmRUM, but not H870 or WC872. I did try H1000 & WC860. IMR7828, BLC-2, RE22, RE25, etc. The 5010 & to a lesser degree, the H50BMG are the only two to come close.

The 5010 gives super velocity, but I haven't nailed down that 'sweet spot' yet. (It's military 'pulldown' powder, hence the $4/lb. pricetag) Yesterday's test was aggravating - great velocities, but so-so to poor groups.

156s were going out @ 3,547 with no pressure. BUT: ES of 82 & SD of 27 [img]images/icons/mad.gif[/img] [img]images/icons/mad.gif[/img] [img]images/icons/confused.gif[/img]

The 176s were too hot at 3,496 & flattened primers. ES was a little better - 52 - with SD at 16. Reduced, these might work out. Groups were better too.

To top it all off, I went out tonight to fireform/dryfire. I went through 25 rounds with iron sights, took a break, & started to clamp on the Nightforce in its Leopold QRW rings. Well, to make a long story shorter, I hadn't listened to what my instincts were telling me about the QRWs when I bought them. I sheared one of the levers OFF & will be buying a set of Badgers tomorrow!!! [img]images/icons/mad.gif[/img]

$#!~~% week....

[ 06-24-2002: Message edited by: speedbump ]
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  #11  
Old 06-25-2002, 09:03 AM
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Re: 30-378 case life

Speed

Excessive velocity will most times always kill accuracy.

If you want good accuracy, they must be slowed down. This can be checked with your chronagraph at the 100, 200 and 300 and 500 yard range, on targets.

Many shooters try to get as much velocity out of a rifle and find that it don't really shoot that well.
The trick is to settle in on a load that gives a bit of BOTH but, not on the excessive velocity side. The high velocity will do you no good at all if you can't hit anything.
Sometimes you will find barrels that will shoot at higher velocities but, not too often.
For instance, I can shoot a 220 gr bullet in my 1000 yard 300 Weatherby Match gun at 3150 FPS but the accuracy range is 3000 to 3025 FPS.
It's more drastic as the cases get bigger and the bores smaller.

Later
DC

[ 06-25-2002: Message edited by: Darryl Cassel ]
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  #12  
Old 06-25-2002, 10:09 AM
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Re: 30-378 case life

That's what I was shooting for - the HAPPY medium. Good velocity, but great accuracy & consistency. Not there yet. [img]images/icons/frown.gif[/img]
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  #13  
Old 06-25-2002, 06:43 PM
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Re: 30-378 case life

Len, have the Cauterrucios arrived yet?

Warren.
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  #14  
Old 06-25-2002, 11:00 PM
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Re: 30-378 case life

Warren

Yes, just today. They look more sleek than the MK's but I don't have a MK here to actually compare with. It will be a couple weeks before I have time to try them as my new 30-378 is here now and needs load developlment work. Thanks much.
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