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7 lrm ballistics.?

 
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  #8  
Old 01-16-2014, 03:59 PM
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Re: 7 lrm ballistics.?

I just checked the H2o capacity on a new 7 LRM and it holds 87.4 grs. filled to top of neck. I don't have a Dakota case but I think they hold around 95 grs.?.........Rich
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  #9  
Old 01-16-2014, 04:47 PM
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Re: 7 lrm ballistics.?

Will the Dakota rim fit into a standard mag bolt? I have all the parts together for a new build and Im down to the 7lrm or 7mm Dakota. I was going to go with just a simple 7x300win but I want fit in to a aics mag without reducing charge. I'm looking to get the 180 berger to 3100 or just north and the 190 to 3000.

So between to two which one is the most likely to meet my goal. Assuming I can use the Dakota case as the rim is bigger. I have a barrel that will finish at 30 or shorter.
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  #10  
Old 01-16-2014, 04:58 PM
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Re: 7 lrm ballistics.?

Quote:
Originally Posted by Long Range View Post
Will the Dakota rim fit into a standard mag bolt? I have all the parts together for a new build and Im down to the 7lrm or 7mm Dakota. I was going to go with just a simple 7x300win but I want fit in to a aics mag without reducing charge. I'm looking to get the 180 berger to 3100 or just north and the 190 to 3000.

So between to two which one is the most likely to meet my goal. Assuming I can use the Dakota case as the rim is bigger. I have a barrel that will finish at 30 or shorter.
There is no doubt that the Dakota will reach higher velocities than the LRM but that isn't to say that they both wouldn't reach your goal with a 30" barrel. Dakota brass is probably tougher but also more spendy. The Dakota rim is .013" larger so would probably require opening the bolt face a touch.......Rich
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  #11  
Old 01-16-2014, 05:18 PM
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Re: 7 lrm ballistics.?

Quote:
Originally Posted by elkaholic View Post
Those must be fairly mild loads? I'm pretty sure the Dakota holds 6-8 grains more than the LRM.......Rich
Those loads in my gun are very close to max!!! there is no way I would start with any more powder. I have over 1000 rnds down the old barrel (rock creek)and new barrel Krieger, and both
barrels shoot within 30 fps of each other and that because on is 24" and the the other is 25". The only rnds I have not chronoed are my hunting rnds, so my speeds are on cause I've also verified them out to 1000 yards.
In my gun, extractor marks would show up with sticky bolt at 75grs of Retumbo and 74.5 grs of H1000.

Elmer
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  #12  
Old 01-16-2014, 05:35 PM
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Re: 7 lrm ballistics.?

Quote:
Originally Posted by elkaholic View Post
There is no doubt that the Dakota will reach higher velocities than the LRM but that isn't to say that they both wouldn't reach your goal with a 30" barrel. Dakota brass is probably tougher but also more spendy. The Dakota rim is .013" larger so would probably require opening the bolt face a touch.......Rich
From what I've read is the Dakota and the 7lrm brass are both made by Hornady. Some say the 7mm Dakota is norma and some say its Hornady.

I have a custom BigHorn receiver with a sliding plate extractor. I will measure to see if it will fit. But if not than my decision may be made for me.
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  #13  
Old 01-16-2014, 06:17 PM
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Re: 7 lrm ballistics.?

Quote:
Originally Posted by Long Range View Post
From what I've read is the Dakota and the 7lrm brass are both made by Hornady. Some say the 7mm Dakota is norma and some say its Hornady.

I have a custom BigHorn receiver with a sliding plate extractor. I will measure to see if it will fit. But if not than my decision may be made for me.
I thought Dakota was made by Norma, but I have owned neither so not sure. Your bolt may work as it is......rich
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  #14  
Old 01-16-2014, 06:19 PM
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Re: 7 lrm ballistics.?

Quote:
Originally Posted by elmerdeer View Post
Those loads in my gun are very close to max!!! there is no way I would start with any more powder. I have over 1000 rnds down the old barrel (rock creek)and new barrel Krieger, and both
barrels shoot within 30 fps of each other and that because on is 24" and the the other is 25". The only rnds I have not chronoed are my hunting rnds, so my speeds are on cause I've also verified them out to 1000 yards.
In my gun, extractor marks would show up with sticky bolt at 75grs of Retumbo and 74.5 grs of H1000.

Elmer
Thanks Elmer! Ya, I was looking at data from longer barrels and not paying attention to load.......Rich
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