Sorry cannot help with 150 Grn stuff but I was using some commercially cast 201 grain Gas checked bullets in this one:-
This one, Muscat Martini of Belgian manufacture, will be sold over the coming winter due to the hassles we are going through.
As for hunting with the .303 well yes as I have a Parker-Hale Supreme No4 sporter and a couple of BSA's built on the P-14 actions one of which I had a Brand new BSA made barrel fitted to in 2009 and got it blacked earlier this year.
Edit;- Forgot to say i was using
The Load in this one.