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7mm rum 7mm rm 180 vld velocities

 
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  #1  
Old 11-19-2009, 09:01 PM
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Location: North Idaho
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7mm rum 7mm rm 180 vld velocities

Guys with these calibers what are you getting in velocity with the berger 180 vld and 168 vld? I just picked up a 7 rum sendero 2 and am wondering what to expect compared to the 7rm. I was getting an honest 3000 fps with the 180 with no pressure signs. Fast barrel maybe? Also it seems hodgdon's data seems to be very conservative. Does this sound right to you guys? I remember the first can of retumbo I bought(around 4 years ago?) at 68 grains the velocity was near 2900 on the bottle and now it's 2800. My chrono(ced m2) is giving me right at the 3000 range. I have a very, very faint ejector mark in the middle of the summer. Thanks for any input.
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  #2  
Old 11-19-2009, 10:37 PM
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Re: 7mm rum 7mm rm 180 vld velocities

I can speak for the powder load part. Most if not all manuals are going to be conservative. The reason being is the lawyer setting at the desk at the company telling everyone it has to be safe. To many different rifles hand max loads at different pressures. So they post a max load that should be with in the original design of the pressures listed by the creator of the caliber. Hope this helps with the load info. I generally put loads together that are 1 to 1.5 grains over max without any problems.

I like your numbers for the 180's out of the Rem Mag. That is encouraging.

Tank
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  #3  
Old 11-22-2009, 02:24 AM
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Re: 7mm rum 7mm rm 180 vld velocities

Anybody else?
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  #4  
Old 11-22-2009, 10:40 AM
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Re: 7mm rum 7mm rm 180 vld velocities

I was barely breaking the 2800 fps mark with 180's out of my 7 RM. That was with Lapua brass and Retumbo out of a 26" barrel. Primers would start getting pretty flat at about 2825 fps.

Last edited by montana_native; 11-22-2009 at 10:43 AM.
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  #5  
Old 11-22-2009, 11:05 AM
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Re: 7mm rum 7mm rm 180 vld velocities

I've shot 400-500 of the 168's and 180's combined from a 7mm RemMag with a 26" shilen barrel. 1:9 twist. I shoot in warm weather at 250 feet above sea level. Roughly.

I found that the accuracy for the 168's was best at about 3000 fps. I was using 64g of RL22 I believe. .080 off the lands! Routine 1/2MOA. I could push it faster but accuracy dropped off. Because of this I switched to 180's. .01 off the lands. Near max load of Retumbo (68g) gives me 2950 fps with the same 1/2MOA accuracy out to 300 yards (shooting range max).

I've run the numbers through my ballistic calculator and at 300 yards this load hits about like a factory 300 win mag with 200g accubonds.

More than one person has commented that 3000 fps is the magic # for the 7mm VLD.

BTW where do you get 7mm Laupa brass?
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  #6  
Old 11-22-2009, 01:00 PM
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Re: 7mm rum 7mm rm 180 vld velocities

Lapua doesn't make 7rm brass. I think maybe he is thinking norma?
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  #7  
Old 11-22-2009, 02:23 PM
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Re: 7mm rum 7mm rm 180 vld velocities

No, it's Lapua brass. There was a guy on Gunbroker selling it a while back. He had 250 pieces of it, I bought 150 of it.
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