Well looked up the British 303 and found that it's bullet die was .312 so that's out.
So I guess my next step will be to look for a sizing die a few thousandths smaller than .309.
Also I thought about lubing the patched bullets before running them through my sizing die to reduce the friction on the paper..

That's what I love most about reloading...no matter how much you know...it's only the tip of the iceberg. Always leaving something new to be learned and experimented with.