This round would be very much like the 257 Kimber, although not quite as 'improved' and with a slightly longer neck. Using Silverfox's case weight (thanks!), my software calculates capacity at 34.7 gr. This is within 0.3 grains of the Kimber with no fireforming. I have dimensions for the Kimber round, but no performance data. Any help would be appreciated.



PS: For a simple neck-up job like this, wouldn't it be possible to use a Redding 204 bushing die with the proper 25 caliber bushing?

if it had 37 gr of water, and 2.04" of case, it would be a 25-35 winchester...

which would hit 2700+ at low pressure (est 38.7k)

jeffe