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Fireplug -

You sure do have some interesting projects. Believe it or not, the 224 Weatherby has a .430 rim size, at a 1.93 case length. Of course, its belted, but you can't have everything. This case will generate 2000, 2200 or 2400 FPE with .264, .284, or .308 bullets, respectively.Not a lot different from rounds based on the 22-250 or 300 Savage.

If you push the shoulder back 0.30 inches and trim to 1.62 inches, you can still get 1700, 1900 and 2100 FPE, respectively.

Also, the 6.5X54 and 6.5 Carcano are close with a rim size of about .450.

Of course, there are many .473 rims that can be milled down to .440. Once you are set up, this milling is really no more complex than trimming - I am surprised it is not done by wildcatters more often, especially going from .473 to .440. A 0.33 reduction in rim will generally not affect feeding. The straight stack CZ magazine should not be that difficult to widen.
 

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Gentlemen -

Again, an interesting thread leading to new ideas.

The 240 was selected because it had a .473 case head and a belt, allowing the use of the full diameter of the case to accomodate bullets that would otherwise have headspacing problems. Neat idea.

Now we find that handloaders can ADD a belt to just about any unrimmed, unbelted case. This idea is revolutionary to me and opens more doors to wildcatting than I can think of at one time.

A large pile of straight cases sporting belts. Just for starters, the '06 can go to .454 inch diameter as an outside dimension at the mouth, which means it can hold any of the .429/.430 bullets made. This case will hold 56 grs of water with a .430 bullet seated 0.40 inches, and deliver 4500 fpe with any appropriate powder/bullet combination. Any 308 Win length case will give you 37 grs of capacity and 3500 fpe.(all 52,000 CUP).

A straight sided 284 will accept .458 bullets and you get a 450 Marlin with a .473 case head. I personanlly would prefer .451 bullets, to get at all the 45 cal pistol bullets and the 45/35 black powder sabots - 3000 fps with a 200 gr psp .358 bullet is within easy reach.

Because of the high energies and velocities, some of these examples will need custom bullets held to 1.2 inches in length, but that's part of the fun. Off the shelf pistol bullets will work fine for reduced loads, and .400 cast bullets will work even at high velocities with 45/40 sabots. A 1 in 16 inch twist rate would be the best compromise for the .430, .451 or .458 barrels. None of these need to be ove 19 inches long to burn all of the fast powders involved, and a couple will work with 17 inch bbls.
 

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Fireplug -

Interesting, he sure didn't headspace it on the shoulder. As you can tell, I like the idea of forming belts on rimless cases with just a set of custom dies.

Does anyone else out there know anything about this practice?
 
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