If you want a real No V that is understandable, but something to consider is that a nice, clean sporterized No IV can often be found for around $150 and can offer the same overall balance and feel. A real No V is probably going to cost triple that cost for a good condition example.
I reload .303 with IMR 4895 or H4895 and use the minimum load listed in the load manual. I have a bunch of 180 grain .311 soft points that MidwayUSA used to sell as "bulk" (plastic bag of 500 inside a plain brown cardboard box) for under a dime per bullet. I have not had to buy any lately so no idea what they cost nowadays. Result is a mellow load that is accurate, easy on the shoulder, and costs about $4 per box of 20 to reload.
I have friends who cast lead bullets for their 303's and love them. I have not gotten into this yet but bought a mold a while back. The Lee mold is around $25 IIRC. You typically want to keep your loads under 1400 fps unless you run a gas check, then you can go to 1800ish fps without leading the bore. These loads are very comfortable to shoot, and are very inexpensive to load. You also put less stress on the brass so it should be useable many times. My friend had a load that felt like shooting a .223, would print close to point of aim, and he was getting over 15 reloads from each case with no stretching. I forget which powders are appropriate for lead bullet loads (google is your friend, or check castboolits dot com) but cost to reload is less than buying bulk 22LR when you get wheel weight lead and cast your own. I understand that wheel weights are now evil contraband in several parts of the US.
