I am not sure why you want a 180 grain bullet with two crimp groves. If this is very very important to you, CH4D makes a tool that allows you to add a channelure to a bullet anywhere you want.
There are all kinds of 180 gr bullets in the marketplace for the 303 Brit. I like the Remington CoreLokt that comes in .308, .310 (MidSouth), and .311 (Graf & Sons).
I know that some bullet manufacturers would be horrified to find that their bullets are being "mangled" by handloaders, but hey, you are the one that really wants that kind of bullet, so I assume you will be very careful.