For those interested, following is some more information on the .358 Hoosier that was posted on another site:

The .358 Hoosier case capacity is somewhat less than the .358 Winchester (.358 Win) case, of course. However, the shoulder is pushed back noticeably less than the overall shortening of the case, resulting in a little shorter neck than the parent case and retaining a considerable amount of the original powder capacity. Back in 1955, when the .358 Win was introduced, there was not nearly the wide variety of powders available for reloading as today. Also, Winchester originally loaded the cartridge to a little higher advertised velocity than today, for example 2530 versus 2490 ft/sec for the 200 gr. bullet. A 250 gr. bullet was originally shown at 2250 ft/sec. That bullet option was later dropped by the factory.

Even back in the early years some reloading manuals showed several .358 Win loads that exceeded published Winchester factory velocities. For example, in the 1st edition (1965) of Cartridges of the World (COTW) it states that “performance can be improved a little by handloading.” COTW goes on to list loads giving 2580 and 2560 ft/sec for a 200 gr. bullet and 2390 and 2400 ft/sec for a 250 gr. bullet. That seems to show significant improvement in performance by using powders different than what Winchester used, and perhaps still uses. Pressures are not given and the most recent COTW does not list those loads. Instead, COTW now gives loads similar to Winchester factory loads from information supplied by Hornady, Speer, and Sierra.

The 25th (1986) edition of the Hodgdon manual shows a .358 Win maximum load giving 2374 ft/sec for a 250 gr. bullet at a pressure of 52,200 Copper Units of Pressure (CUP). The current Hodgdon powder website (for Hodgdon, IMR, & Winchester powders only) ( http://www.hodgdon.com ) shows maximum .358 Win loads giving 2565 and 2630 ft/sec for the 200 gr. Hornady PSP bullet, and 2257 and 2260 ft/sec for the 250 gr. Nosler Partition bullet. The website shows the above loads with pressures in the range of 50,500 to 51,800 CUP.

Today there are many different powders that did not exist in 1955. Many have filled large gaps (niches) in powder burn rates that existed back then. Some current cartridge manufacturers, such as Hornady, have taken advantage of these new powders (and new pressure measuring technology) to boost velocities of some of the older cartridges, such as the venerable .30-06. And, they still keep their new factory ammunition within industry accepted pressure limits. Similarly, handloaders can safely gain several more feet per second from many cartridges, wildcats as well as factory, than was possible several years ago. It is now widely accepted that many of the smaller capacity cases are indeed very efficient. Combine the smaller case capacity, improved powders, and a relatively large caliber, and you can achieve some pretty respectable velocities with a given bullet weight at safe pressures.

I think we live in a Golden Age of Reloading.