I have a LongBranch in 6.5 X57R, great to shoot, I make the cases from 8X57JRS, 7X57R and 303.
my others an in 303S. it shoots as well as 303B and is a little softer on the cases, as yet no base split problems. I have a very good supply of new 7X57R cases, thet are expensive here in Franceicon and the 6.5X57R is even more expensive.
I like the 30.30 round, I shoot a 94 and is a great round for the sise of rifle. It is easy to keep a good group.
I reload with 30M1 round nose with a light copper wash so are quit light.
I am trying to get a complete No 4 Savage action at the moment,
So I will have an open book to choose from regarding what case to use.
I might go for a .222 rem.