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.