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7mm Allen Mag test rifle finished.....

 
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  #1  
Old 07-03-2005, 09:16 PM
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7mm Allen Mag test rifle finished.....

TO all,

Well, after a late night last night I got my first 7mm Allen Mag test rifle finished up. I do not have any pics of the rifle yet, nothing special, here are the componants of the rifle:

-Rem 700 fully accuraized receiver
-Holland Comp Recoil Lug
-Lilja #5 contour,27" 1-9 twist(1-7 barrels not ready yet)
-Holland QD Muzzle Brake
-Fajen Thumbhole sporter laminate stock, Pillar bedded
-Burris base, Signature rings
-Weaver 4.5-14 Tactical mil dot

Anyway, got the rifle assembled about 10:30 PM last night and simply had to see what one of these fat 7mm's would look like fireformed so I loaded up some fireforming loads using 90.0 gr Retumbo under a 160 gr Accubond, only 7mm bullets on hand at the moment.

This is a pretty mild load but blows the shoulders out well. I think 93.0 or 94.0 would be a better choice to get sharper shoulders but this works.



Sorry for the huge size, I am using a picture host I generally do not and I can not seem to get the pics smaller. Don;t know why.

Anyway, these are two fireformed 7mm Allen Mags flanking a 7mm-338 Lapua virgin fireforming load.



This pic compares the 7mm Rem Mag, 7mm Allen Mag and 7mm RUM. The case capacity of the fireformed 7mm Allen Mag is 15 grains larger then the 7mm RUM in spite of only having a case length of 2.700"!! When both seat bullets to 3.650" the Allen Mag has an even larger capacity advantage.



Here we have the 257 Allen Mag(156 gr ULD RBBT), 7mm Allen Mag (160 gr Accubond), 7mm Allen Mag (200 gr ULD RBBT prototype) and finally the 270 Allen Mag with the 169.5 gr ULD RBBT.

It is kind of hard to believe the shorter 7mm has the largest capacity of the three but sometimes good things come in short packages. Considering the shoulder diameter of the 7mm Allen Mag is 0.021" larger then the base diameter of the other two Allen Mags it is easier to understand way. Again, if the rifle is throated to seat the bullets to 3.650-3.700", the capacity advantage of the 7mm Allen Mag increases even more.

I throated the reamer as it was as I did not have a 200 gr ULD RBBT to design the reamer off from at the time. I have a 7mm throating reamer ordered that will allow me to throat the rifles for these huge bullets and provide a increase in usible case capacity.

At this time I am simply in the barrel break in process but wanted to get those interested a sneek peak at the new Allen Magnum case design.

I hope to get some range reports by the end of the week.

Kirby Allen(50)
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  #2  
Old 07-03-2005, 09:32 PM
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Re: 7mm Allen Mag test rifle finished.....

Kirby:

Looks like the newest member of your family is a stocky little devil. Get him some good stuff to eat, a good tube to run in and start the workouts.

Very interesting visual comparison between the 270 and 7mm rounds.

It looks like the waiting has been worth it. I can hardly wait to see the range results.
[img]/ubbthreads/images/graemlins/grin.gif[/img]
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  #3  
Old 07-03-2005, 09:34 PM
 
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Re: 7mm Allen Mag test rifle finished.....

Kirby,
Thanks for the sneak peek, looking forward to the range reports.
Wayne
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Old 07-03-2005, 09:42 PM
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Join Date: Jan 2005
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Posts: 540
Re: 7mm Allen Mag test rifle finished.....

I will be setting on the edge of my seat waiting to hear the results on this one for sure Kirby!! [img]/ubbthreads/images/graemlins/wink.gif[/img]
This one is next on my list of Allen mags!!
I'm drooling anticipating the arrival of my first and reading of it's new big brother makes it even sweeter!!
Keep us posted Kirby!
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Old 07-03-2005, 11:21 PM
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Re: 7mm Allen Mag test rifle finished.....

Hey Kirby. I don't mind the larger pics that much. Photobucket just seems to be that way. Nice close ups though!

What is the magazine capacity again on the new 7mm? I may have to get one of those to join the 270 you're already making me now. [img]/ubbthreads/images/graemlins/grin.gif[/img]
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Old 07-03-2005, 11:29 PM
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Re: 7mm Allen Mag test rifle finished.....

Kirby,
the pressure is on. Now you got us waiting! [img]/ubbthreads/images/graemlins/wink.gif[/img]
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Old 07-04-2005, 05:59 AM
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Re: 7mm Allen Mag test rifle finished.....

Really nice. What a way to spend the Fourth of July weekend

It will look even better when the throat reamer comes with the bullet seated out a little further.

Once everything is tested out would there be any difficulties in building a customer a 7mm AM on a Nieska Bay or Bat single shot action? I am so used to a Ruger #1 that I do not feel any need for a magazine.
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