.327 Federal Magnum (using Hornady bullets)
Date: Mar 20 2013
The .327 Federal Magnum was introduced in 2007 and is essentially a lengthened .32 H&R Magnum case but loaded to substantially greater pressures. ATK, owner of Federal Cartridge, lists it as "proprietary" and with a maximum average pressure of 45,000 psi. In spite of a misleading name (probably for marketing reasons) it actually utilizes .312-inch bullets. Older .32 H&R Magnum dies can be used to handload the .327.
Since the .327’s introduction, every reasonable powder, bullet and primer combination has been tried to develop accurate loads. One problem that has repeatedly given handloaders difficulties is finding a correct combination that will give low extreme spreads and accuracy. In many instances, velocity variations exceeded 200 fps. A couple of tips that may help get that figure to below 50 fps includes using a .308-inch expander ball to assure reliable ignition, and use a heavy roll crimp.
When using Hornady XTP bullets, seat the bullet with the case mouth even with the upper edge of the cannelure, then apply the crimp. Using a Small Pistol standard (non-magnum) primer has proven to decrease extreme spreads while giving plenty of ignition for the relatively small powder charges associated with this cartridge.