This evening I shortened up my dummy cartridge to 3.015". This with a SA 650g projectile.

It fits and FEEDS in a Winchester 70 WSM action.

Unsure of how it would perform in a long action Remington, but for what you can pick up these push feed WSM's.....I'd go shopping.

I may go ahead with this project, I'm REALLY surprised that it feeds.

Any updates on this? Been trying to sort out my 300-221 gas piston project and haven't had the time to work on this yet. Still thinking about it though. It would be a hell of a good cartridge.

I bought some 50 Alaskan brass a month or so ago.

Had Kiff grind me a toolbit that matches the extractor groove in the WSM series.

Takes about 30 seconds to turn the rim off and cut an extractor groove in the Alaskan brass.

Trim to desired length and go at it.

Its really nothing more than a lengthened 50 EBG/SOCOM, as I can run those cases through the respective dies and have an exact replica.

But you've got a lot of additional case capacity available due to the length if you so desire.

tag
 

sorry for the resurrection of an old post. Tag for an idea.

.510 Whisper is made from .338 Lapua Magnum. I found the Norma brass to be amazingly consistent in wall thickness even down there below the original neck.

The Whisper is interesting in that the shoulder and neck are not formed in, they are machined in. In other words, the interior of the case does not follow the outer, bottle-necked contour. The case wall just gets thinner at the neck.... part of why they are hard to make and thus not cheap, but JD Jones had his reasons for this and I think it is a clever design.

I use the 338 Lapua brass and they seem to last along time as I have
over 20 loadings with one batch of 100 pc's.
If you have a lathe they are easy to make
JD told me they will last forever for the 510 Whisper

50 Alaskan cases
 

I have a Siamese Mauser action, a Ruger No. 1, and a Savage single shot precision target action. I'm strongly considering the unmodified 50 Alaskan case from Starline for both the price of brass, and not having to mess with neck turning or other case modifications. Hornady has dies on the shelf.

I'm hoping to make the savage work, but if I can't the other two are proven on rimmed cartridges. I suppose I would only be out a savage bolt head to try it. Input appreciated.