Thanks for the replies, I ended up with Vhit 133 and CCI primers as recommended by my local shop.
I've just finished loading up x20 52 Grain A-Max (thanks Boydy), hopefully things will be ok. Must admit, I'm a bit nervous!
- Once fired Winchester brass, FL sized, sonic cleaned, neck trimmed, deburred and primer pockets cleaned
- Added CCI Primers using Hornady hand priming tool
- Batched cases into four lots of 5 and varied the powder charge (x5 20.6gn) (x5 21.0gn) (x5 21.4gn) (x5 22.0gn)
- Seated 52 Grain A-Max just a tad under recommended C.O.L
It's all a learning curve for me at this stage. Fingers crossed (lets hope I have some left after tomorrow!)