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7mm Ultra Mag...180 Berger...Need Data

 
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  #1  
Old 09-06-2010, 07:55 PM
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7mm Ultra Mag...180 Berger...Need Data

I have been long range hunting and shooting for years. I just picked up a remington sendero in 7mm Ultra mag. I bought this gun so I could take advantage of the 180 Berger bullet. I have recieved the data from berger and loaded the max of

86 grains of Retumbo with an OAL of 3.65.

chronographed muzzle velocity average of 2930 of 5 shots

.5 Moa groups @ 100yds

The claimed velocity from berger out of an 24in barrel is around 3050. So my 26in barreled sendero should be a tad faster than that. I know that reloading datas claimed velocity is never close to actual chronographed muzzle velocity but I feel that there should be alot more speed to be had out of this case. With the was the bullet is seated....which is way down in there to get it to feed out of the magazine....there is plenty of room for more fuel. I was wondering if anyone on this sight has loaded this round and if there is any more data for the 180 berger. I would like to see it over 3000 and have found rumors or claims on the web of up to 3200 fps, but of course no data and the ones making the claim probally have never even heared of a chrono. I know this round has a serious overbore problem which could result in increased case pressures so I really dont want to get to wild with going over bergers max recomendation without someone else tryin it first..

any info will be appreciated.

thanks...David
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  #2  
Old 09-06-2010, 09:12 PM
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Re: 7mm Ultra Mag...180 Berger...Need Data

Try Hodgdon US 869. It is excellent with heavy bullets for caliber. I would start at about 99 grains and work up slowly.
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Old 09-07-2010, 05:13 PM
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Re: 7mm Ultra Mag...180 Berger...Need Data

where did you come up with the 99 grains?
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Old 09-07-2010, 05:29 PM
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Re: 7mm Ultra Mag...180 Berger...Need Data

i had a 7rum and shot the 180 Bergers at 3250. this was a 30" barrel, 3 groove, 7 twist. used 100 gr of 872 powder. i always felt that Retumbo would give me more velocity because others did. walk your powder charge up until you get a sticky bolt then back off about 3 gr, that would be your max with that combo.
i didn't have the cartridge long, i rebarreled it to an edge and never looked back.
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  #5  
Old 09-07-2010, 06:08 PM
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Re: 7mm Ultra Mag...180 Berger...Need Data

I will try working the loads up with retumbo. As long as the accuracy stays? I will keep everyone posted
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Old 09-07-2010, 10:52 PM
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Re: 7mm Ultra Mag...180 Berger...Need Data

Quote:
Originally Posted by william70d View Post
where did you come up with the 99 grains?

Hodgdon
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  #7  
Old 09-08-2010, 04:40 PM
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Re: 7mm Ultra Mag...180 Berger...Need Data

so you going with a middle of the road powder charge for a 175 grain bullet. Is this safe?

175 grain sft sp
min 95 grains, max 102 grains

Is data like this typically used?
Thanks
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