Well things are coming along nicely with the Allen Magnum rounds research. The reamers for the 257 AM and the 6.5mm AM have been finalized and ordered.
The 270 AM reamer will be ordered with a week or so.
I talked with Richard Graves, owner of Wildcat Bullets who is designing the bullets for these three new rounds and he had some extremely interesting news on the .257" and .277" bullets in particular.
This information will be of particular interest to us on this message board because it deals with long range shooting.
Along with high B.C. big game bullets for these rounds, we are also trying to develope some ULD bullets that will take these rounds farther and flatter then the 257, 6.5 and 270 have ever gone before.
Preliminary results with two bullet in particular seem extremely impressive. The first is a 145 gr ULD Rebated Boattail for the 257 AM. Richard tells me the initial B.C. reposts are that this bullet will produce a B.C. of .738 but he also feels that with a little tweeking this bullet will hit the .750 mark in B.C. with no problem.
These bullets are modeled for use in a 1-7 to 1-8" twist with the 1-8 being the best for the velocity range we will be driving them to.
Unfortunately Lilja does not offer this twist in the 257 but Pac Nor does and these barrels in their Super Match grade are certainly top grade match barrels.
The next bullet is for the 270 AM. This is a 169.5 gr ULD Rebated Boattail which is producing B.C. values of .748!!!
Again, this bullet will probably need a 1-8 twist, again not offered by Lilja but again Pac Nor does offer this barrel.
To put these bullets into some perspective, the 240 gr Sierra Mk in .308 runs in the .710 to .720 range in B.C.
The 300 gr Sierra Mk in .338" is producing a B.C. in the .780 to .800.
Now to get either of these two bullets to 3100 fps you need a very long barrel(+30") and a very large case capacity.
Recoil is also quite impressive without a 20 lb rifle or muzzle brake
The 257 AM and 270 AM will produce velocities far over 3100 fps with these bullets and with recoil in the 7mm Rem Mag to 7mm RUM levels.
With a 9 lb rifle for big game hunting and a quality muzzle brake, these rifles will produce less felt recoil then a 25-06 or 270 Win but with the ranging preformance of the 30-378 and 338-378 Wby.
These were out performance goals from the start and it looks like things are going to hit their mark. There is still the ever important load developement but that will come in the next little while.
These rounds are shaping up even better then I had predicted!
Will keep you posted. There are some of these heavy ULDs on the way from Canada so I will post some pics when they arrive.