Re the 30-30, some options to consider.
Try the Peregrine VRG3 Bushmaster bullet. These are a flat nosed bullet designed to work at low velocities and close range on big game. The 135 and 150gr work in 1 in 14” twist and their load data gives 4 different loads for the 30-30 cartridge
Peregrine bullets are available in the UK, but you might have speak with the importer re the VRG3 in .308 cal.
In the US
Choice Ammo and Buffalo are loading a 150 Barnes TSX FN bullet in their 30-30 load
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30-30 Winchester 150 Grain Barnes TSX (Lead-Free)~100% Hand Loaded !!
.30-30 Winchester 160 grain FTX hand-loaded ammunitionchoiceammunition.com
30-30 WIN. LEAD FREE Rifle Ammunition
30-30 WIN. LEAD FREE Rifle Ammunition Field Proven rifle and gun ammo. Maximum firepower bullets. Best ammunition for rifles and guns for sale. Buffalo Bore. Strictly big bore. Strictly Business.www.buffalobore.com
Again haven’t a clue whether such bullets are being brought into the UK. Ask your RFD to see if he can get them. Or go straight to whomever imports them. Even better have a few others with 30-30’s that are used for hunting and thus create a market demand.
Or approach one of the UK bullet manufacturers to develop a bullet. The beauty of the turned monolithic type bullets is that on one cnc lathe you can make any bullet you like. The investment is the design and programming, and in these days of CAD that’s not huge.
like the way you suggest trying to buy bullets that you do not even know will be or will ever be in the U.K. , may as well suggest you buy a small lathe and some copper rod and make your own