Originally Posted by Chris R
Does anyone know where I can get load data for an Improved 7mm-08
Here is some load data for the 7mm IHMSA International cartridge used in unlimited silhouette pistols. It is a .308 necked to 7mm and fire formed. The shoulder is 38 degrees rather than the Ackley's 40 degrees, case length is 1.866". For all practical purposes it's the same cartridge. If anything, the Ackley will have a miniscule more case capacity, but don't try to load hotter as performance won't improve enough to warrant the higher pressure.
140 grain Nosler Solid Base;
Hodgdon H322 start 30.0 to 33.0 grains maximum. Groups ran .34" (32 grains) to .72" (31.0 grains) 10 shots - 100 yards in an Rem. XP Pistol! Velocity 2,196 fps to 2,412 fps (15" barrel).
Hodgdon 4895 start 28.0 grains to 32.0 grains maximum. Groups ran 1.10" (28 grains) to .64" (.32 grains). Velocity 1,963 to 2,240 fps.
168 grain Sierra MatchKing;
Hodgdon H322 start 29.0 grains to 32.0 maximum. Groups ran from .27" (30.0 grains) to 1.08 " (32.0 grains). Velocity 2,098 fps to 2,260 (again, in a 15" barrel).
Hodgdon H4895 start 30.0 grains to 33.0 grains maximum.
Other powders used are H-4198: 26.0 to 28.0 grains with 140 grain bullets. 26.0 to 29.0 grains with 154 grain bullets.
Winchester 748: 33.0 to 36.0 grains with 150 grain bullets.
Data is from Reloading Guide for Handgun Accuracy (IHMSA 1982) and Loaddata.com.
This cartridge is one of the most accurate ever designed, although part of that is the high quality of the arms built for it - ridgid single shot action Wichita and Remington XP pistols with precision fitted barrels and short lock time. I used Federal match brass with small primer pockets and benchrest primers, with H322 powder and my own 145 grain jacketed open point bullets. It would group .50" in a calm wind but always under .75" at 100 yards, and that with open sights and a 15" barrel! For deer sized game it can't be beat.