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I think the .360ex is a .364-.366 cal bullet.

Enjoy the range. Best fun to have on testing loads.

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I will measure the bores tonight. In going through the Holland & Holland case the rifle has inhabited for quite a few decades, I spent some time reading the index cards prepared by its previous owner. The only date noted on the cards was December, 1949. I wish I knew more about who owned this before me!

On those cards were bore measurements of 0.360" and groove diameter of 0.368-9"

If those turn out to be accurate, can you experts recommend

1) what diameter jacketed projectile to use? I have some new-old-stock RWS 9.3x72r bullets that are 193grain 0.362" or could order as needed, possibly from Hawk. For a few testing rounds, I could also tear down some factory 9.3x72r with 0.366" projectiles

2) what diameter lead projectile to use? I suspect I'll be ordering another mold from Accurate. What alloy for a NfB load going no faster than 1650fps?

Here are the cards: