Your not going to get much information because there are not many out there!!! [img]/ubbthreads/images/graemlins/grin.gif[/img]
Powders for this round will be Rl-25, H-1000 and Retumbo as well as the slow ball powders such as Ramshot magnum, AA8700 and US869. WC872 is pretty slow for this case capacity which is very similiar to a 7mm STW in capacity. These would be for bullets in the 140 to 169.5 gr range.
For the lighter bullets, Rl-22 and H-4831 can also be used with good results. Just have to watch your pressures because you can pressure out in this case capacity with these powders.
Powder capacities depending on what bullet weights you use will be in the 78 to 90 grain range depending on what powders you use. The lower end will be for the faster stick powders, for heavier end for the very slow ball powders.
These are averages. Some barrels will be a bit more, some a bit less.
Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.
It did in fact score me a bit when it first came to me that it was temp sensative, but further testing has shown me how it can be regulated.
I cut my powder charge 4 grains in my 7mm Allen to shoot above 75 degrees, and still shoot the same velocity, quick multiple shots will give you a heavy bolt lift in warmer temps, here's the results of my tests
7mm Allen mag all velocity's are with 160 gr accubonds and 105 gr of WC872 in a 9 twist 4 groove lilja 30" long
single didgets to 55 degrees 3470-3495 fps
55 to 75 3520-3550 fps
75-95 3650-3720 fps heavy to impossible bolt lift