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Len's new 7 LRM - first day at the range

 
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  #36  
Old 02-22-2013, 08:28 PM
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Location: Dallas,OR
Posts: 321
Re: Len's new 7 LRM - first day at the range

Quote:
Originally Posted by brentc View Post
180's in his signature.
Yep, it's the 180VLD. I wanted a cartridge that would shoot the 180VLD at 3100fps or more without having burn too much powder, fit in a std long action magazine and not be a barrel burner. The decision also was made based on the fact that Gunwerks was able to do the work and have the barreled action back to me in less than 2 weeks! The rifle shot sub moa during load development, but the load listed will consistantly put 4 shots inside of a 1" bullseye at it's 200 yrd zero.
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180VLD's@3145fps. with 72.8grs. of H1000, 215m primer
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  #37  
Old 06-24-2013, 07:03 PM
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Join Date: Apr 2009
Location: Northern Utah
Posts: 16
Re: Len's new 7 LRM - first day at the range

Thanks for a great thread, Len. Thanks to all who contributed. I just ordered a 7LRM reamer from Genwerks today to build one for myself.

Over the past 10 years I've become captivated with the 7mm/.284 bullet and the factory casings pushing them. Living and hunting out west has made me a follower of the long range hunting order. My first rifle purchased was a Browning BAR Safari II w/BOSS in 7mm Rem Mag. Great gun, super accurate, killed several animals, great novelty rifle but not much good for long range hunting. Since then I've built other rifles around the 7mm Rem Mag, 7mm WSM and the 7mm Ultra Mag. The 7mm Ultra Mag being the most potent and accurate at extreme distances. On it I used a factory Remington 700 barreled action, Wyatt's extended box magazine, Timney Trigger and a VAIS muzzle brake all bedded into an H-S Precision sporter style stock. At an elevation of 5,000 feet and a temperature of 50 degrees it pushes a 180 grain Berger VLD at 3,250 fps. 3/4" to 1" three shot groups at 200 yards from a bench. Load is 92.0 grains Retumbo, Fed GM215M with a COAL of 3.820". From first hand experience I can tell you this bullet and cartridge combination is way to much for mule deer and pronghorn antelope.... like shooting prairie dogs with 95 grain VLD bullets from a .243 Win. But it's awesome on big bull elk and Alasken moose.

Now it's time to tame it down a bit and try this new 7LRM. Again, thanks for all your comments. Very helpful.
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  #38  
Old 06-24-2013, 07:43 PM
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Join Date: May 2001
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Re: Len's new 7 LRM - first day at the range

Good luck with your project. Please come back and report.
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  #39  
Old 06-25-2013, 05:44 AM
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Join Date: Dec 2005
Location: Tucson Az
Posts: 1,096
Re: Len's new 7 LRM - first day at the range

Len,

After reading your thead this past winter I partially blame you for causing me to make a 7mm/375 Ruger. I had a box of 375 Ruger brass I purchased a few years ago. I wanted to neck it down to 7mm but never got around to it. I followed this thread and it was the catalyst.

I decided to go about this differently than Gunwerks . I have a ton of dies and decided to see if I could neck down the 375 case with things on hand. I didn't try to move the shoulder for a longer neck.

Fortunately I have a Whidden 338 RCM bushing/FL sizer die along with 338 RCM Hornady dies. The RCM and 375 share the same shoulder angle as well as diameter. I began my quest to make the 7mm/375. After using six steps with a variety of dies I got to 7mm.

Ordered a .317" neck 7mm/375 Ruger reamer from PT&G. I have an old lathe and do my own barrel chambering.

I took a Redding 7mm Rem mag competition seater die and recut the body guide with my 7mm/375 reamer. It works great!

Turned the necks to .013" and used the Whidden 338 RCM bushing die with the appropriate bushing for sizing the neck. The only die I purchased was a RCBS 375 Ruger FL and seater set. I use the FL die for partial FL sizing.


First experiment was to rechamber a 7mm Rem mag. Barrel is a short 22" but it gave me a chance to try some things. Obviously it wouldn't give me the velocities but I could learn what powders would suit the case. Tried H1000 and then moved to RL-33 with a moly coated 180 hunting VLD. It shot well with the 180 going 2980 with 84 gr of RL-33.

A friend sold me a SS 30" #5 fluted Lilja 1 in 9 that was a 7mm STW with almost 400 rounds through it. After setback and rechambering it is 29 1/2". I began load development with the (no moly) Berger 180 target hybrid and 82 gr of RL-33 working up to 85 grs. 85 was slightly over the top. Settled on 83 grs for velocity of 3175 fps. Tested rifle out to 500M and it shot very well. Come ups matched JBM predictions using Berger's G7 BC of .345.

I realize the 7mm LRM has slightly less powder capacity but thought I'd share the results with RL-33 and 180 gr bullets. I would suggest if anyone wants to try this powder with the 7mm LRM to start around 80 gr and work up.

Your last comments on another coming back to report prompted me to share the above. Hope it is helpful to other 7mm/375 owners as well as similar variants like the 7mm-300 win mag or the 7mm Mashburn.
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  #40  
Old 06-25-2013, 05:54 AM
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Re: Len's new 7 LRM - first day at the range

Thanks so much!

What an interesting project.
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  #41  
Old 06-25-2013, 06:21 AM
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Join Date: Dec 2005
Location: Tucson Az
Posts: 1,096
Re: Len's new 7 LRM - first day at the range

Yes Len it is fun.

I just installed another 7mm/375 chambered barrel on a third rifle last week! This one is on a Rem 700 using a rem 700 takeoff in 7mm Rem mag. The barrel is totally floated so all I have to do when it wears out is run the reamer into the next rem takeoff and install. Going to shoot the heck out of this package saving the long barreled one for big game only.

The first rifle's barrel was on the end of its life so I'll pull it and rebarrel to something else.

This rifle is in a Boyd's tacticool stock. Going to see if it suits me. The price sure was reasonable and the inletting was excellently done. Only $125! link:
Boyds: TACTICOOL REMINGTON® 700 BDL LONG ACTION FACTORY BARREL CHANNEL LAMINATE STOCK W/BLACK TEXTURED FINISH TactiCool

There is another benefit to the 7mm/375: There is no shortage of 375 Ruger brass!
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  #42  
Old 06-25-2013, 06:44 AM
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Re: Len's new 7 LRM - first day at the range

Can someone explain how the 7LRM compares/differences/performs against the 7STW?

Thanks
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