ANYONE HEARD OF 7MM. IMSA?

[pepemarine]

I´VE BOUGHT A RIFLE IN 98% CONDITION FOR A CALIBER CALLED 7MM. IMSA WITH TEN BOXES OF RELOADED AMMO. THE RIFLE IS A 700 REMINGTON ADL.
IN MY RELOADING BOOK THERES NO MENTION OF THIS CALIBER SO ANY HELP IS WELCOME.

THE BULLETS ARE 7MM. AND THE CASES ARE .300 SAVAGE.

[Steven Mace]

Pepemarine, I believe you're actually referring to the 7mm IHMSA cartridge. Elgin Gates created a series of cartridges from .25 to .35 caliber based on the .300 Savage case using a 38 degree shoulder. The intent was to create easy-to-make cartridges for competitors specifically designed for single-shot handguns that would provide the desired momentum to distant targets. You should be able to find reloading data for the 7mm IHMSA in the Sierra, Speer, Hornady and Nosler manuals. Hope this helps!

Steve Mace

[NicMk5]

From "Cartridges of the world" 6th edition, page 403
7mm IHMSA International
Horandy 139gr w/42gr. H4350 MV 2269
Hornady 154gr w/34gr. H4895 MV 2165
Speer 160gr w/43gr. H4831 MV 2162
-----------------------------------
I am sure this is from a pistol barrel.
As always start 10%lower and work up.
BTW I would confirm this data from other sources before reloadind anything