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A head scratcher

 
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  #1  
Old 06-30-2010, 08:07 PM
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Location: Boise, Idaho
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A head scratcher

I am shooting a sendero 300RUM, am shooting 210gr bergers.
At 100 yards with Retumbo, H1000 and RE25 and RE22 powders I get great groups. Then I move out to 200 yards and my groups open up quite a bit. At 100 yards I can cover 5 holes with a quarter, at 200 yards I can cover 5 holes with 4 inch circle. Do I need to mess around again with bulllet seating depths or powder charges?
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  #2  
Old 06-30-2010, 08:21 PM
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Re: A head scratcher

Quote:
Originally Posted by freebird63 View Post
I am shooting a sendero 300RUM, am shooting 210gr bergers.
At 100 yards with Retumbo, H1000 and RE25 and RE22 powders I get great groups. Then I move out to 200 yards and my groups open up quite a bit. At 100 yards I can cover 5 holes with a quarter, at 200 yards I can cover 5 holes with 4 inch circle. Do I need to mess around again with bulllet seating depths or powder charges?
Yes for sure you do I never test a load at less than 200 yards. Bullets are just starting to stabalize at 200 yards.

Bergers are easy though do a seating depth test with your load at 200 yards min.
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  #3  
Old 06-30-2010, 08:38 PM
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Join Date: Jul 2009
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Re: A head scratcher

I would yes
I like you do test loads at 100 yards but only to elimenate some powders
I load up 6 or 7 differant loads, 12 rounds each I shot one three shot group of each then compare them and toss the worst one or two and repeat the process
I take the best two or three loads and load 12 to 16 more rounds and reapeat again at 200 yards.
I agree with ICANHITHIMMAN you need to test at 200 yards but I dont think a load that wont shoot under 1 in at 100 yards will get any better at 200
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  #4  
Old 06-30-2010, 10:47 PM
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Re: A head scratcher

I am fairly certain that I am going to go with retumbo, partially because I have an 8lb jug. But with my chrono the speeds are pretty consistant. I had a problem with some brass the last time out, I now know how hard that 300RUM is on brass. I found probably 12 cases that had cracks on the inside. Plus the primer pockets were getting large. I have some more loaded up at several different depths. 1. Lands, .020, .040, .060 and .080
I am also going to try some 200gr Sierra's
I like the fact that the retumbo is on the extreme powder list, so come deer season this fall and if there is snow on the ground I know the powder will still perform. I had played once with some US869 and that stuff does not like cold weather.
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  #5  
Old 06-30-2010, 11:23 PM
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Re: A head scratcher

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Originally Posted by freebird63 View Post
I found probably 12 cases that had cracks on the inside.
Cracks on the inside???? Long ways or around the case?

Either way the cracks raise some kind of a flag. Most probably a read one.

The only time I've got circumferential rings was when fire forming cases and didn't leave a neck bump resulting in excessive head space.

Justathot.
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  #6  
Old 06-30-2010, 11:51 PM
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Re: A head scratcher

Yes it seems most of the cases were ones that had been annealed and were around the whole case, the cases that were not annealed did not have the cracks. I figure by the time I get a load developed it will be time for a new barrel....might be forced into bumping it up to a 338 edge or Lapua???
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  #7  
Old 07-01-2010, 10:23 AM
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Re: A head scratcher

What's the odds of a pic?
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