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load data for 7mm LRM

 
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  #1  
Old 01-12-2014, 05:32 PM
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Join Date: Jun 2011
Location: Florida
Posts: 322
load data for 7mm LRM

So my new play toy should be ready in a couple of weeks. Im having a gunwerks 7mm Lrm built but do to the current powder situation I cant find any Retumbo for my baby. My question is does anybody have any load data for the 7LRM using the new 178gr Nosler LR Accubonds using H-1000? My gunsmith is using 72 grains of Retumbo getting 3050fps, he told me to start with 70grains of H1000 and start from there. Does this sound close to about rite? He switched from H1000 because he was getting pressure without velocity with 180gr bergers and never loaded the Noslers over h1000.

I just dont want to blow up a $3500 gun with the first shot. I have contacted Mike at gunwerks about this and he said they havent done any load data yet with them.
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  #2  
Old 01-12-2014, 06:26 PM
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Join Date: Feb 2013
Location: SW Alaska
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Re: load data for 7mm LRM

I'd try get my hands on some US-869 and start at 72 grains and work up. It isn't an extreme powder, but with a slightly slower burn rate than retumbo you might have some luck with it. I don't think that you will get compressed loads as this powder is very dense and a ball powder. N570 at 72 and work up might work well as it is a touch slower than retumbo also.

Reuben
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  #3  
Old 01-12-2014, 11:21 PM
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Re: load data for 7mm LRM

Thanks Reuben Ill see what I can get ahold of and go from there, but with the way powder is going these days I might come up to Alaska and see if I can find gold easier.
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  #4  
Old 01-12-2014, 11:40 PM
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Join Date: Feb 2013
Location: SW Alaska
Posts: 131
Re: load data for 7mm LRM

I here you there. The powder supply up here is gone as soon as a shipping box is opened. I am having a very difficult time getting H4831 or R22 for my upcoming project. H414 will have to suffice for now. Good luck on the powder hunt.

Reuben
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  #5  
Old 01-13-2014, 08:37 PM
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Join Date: Dec 2013
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Re: load data for 7mm LRM

This is my first post on here.



funny you said you didn't want to blow up gun on first shot because that's about what I did. New gunwerks barreled 7 lrm. New gunwerks brass 72 h-1000 3.420 .017 off lands cci 250 Berger 180 . First shot blew primer out, hard bolt lift , huge smiley face, and I thought well that sucks first shot on 27" Krieger



I believe it was partially my fault. Bullets were extremely hard to seat. the hornady dies were cutting into case necks causing material to get pushed in between bullet and neck
And the first bullet I tried was one of the worst looking ones



Was unbelievably hard to unload them with hammer. I have since run all through suplied expander button, brushed inside of necks, trimmed necks just taking high side off, scraped burr and rough edge off seater die and swapped out bullet seating piece with the other one that came with set, and just generally slowed down and taken my time. All bullets seat great now. I ordered a .317 bushing so I can have even less tension and use the non expander button. Neck tension measured .001 but the neck is so long it has a lot of gripping surface to hold bullet in my limited opinion


70 h-1000 was pushing 180 @ 2975 no psi sign
71 h-1000 3040 fps no psi sign
72 h-1000 3060 fps barely shows ejector mark on brass

I never seem to be surprised what issues I can have or myself

Will say gun broke in awesomely, they cut good chambers as far as that goes

And all groups have been .5 moa even when cleaning every shot


I wil do a more comprehensive report and will try retumbo maybe that will give me more speed with less psi



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  #6  
Old 01-13-2014, 08:43 PM
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Join Date: Dec 2013
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Re: load data for 7mm LRM

Hodgdon Powder


Has 8 lb kegs in stock
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  #7  
Old 01-14-2014, 02:38 PM
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Join Date: Dec 2013
Posts: 79
Re: load data for 7mm LRM

see pic of what i was trying to say
Attached Thumbnails - Click to View Larger
load data for 7mm LRM-photo.jpg  
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