RCBS 140 gr Silhouette in 6.5 X 257

[Blkpwdrbuff]

I have a rebarreled Jap Arisaka in 6.5 X 257 and a RCBS 140gr Silhouette mould.
Does anyone have any experience with this cartridge and mould combination?
The barrel is an Adam's & Bennet that Midway used to sell, so it's not the original Arisaka barrel.
I'm looking for load data and any hints about the bullet mould.
Thanks in advance,
Blkpwdrbuff

[Larry Gibson]

The cartridge was a common conversion years ago to clean up over sized jap 6.5 chambers or to simplify brass availability. It is simply the 6.5x57 cartridge. Very similar in ballistics and case capacity to the 6.5x55 Swede of which load data for the 140 gr cast bullet would be useable. The A&B barrel probably has a 9 or 10" twist barrel and a .264 groove diameter which should make a better "fit" for the RCBS bullet.