The reality is that if he made a 174 gr bullet that had a G1 BC over .411 then you might be able to get that kind of money. The issue would be how tough of a jacket the bullet would be, most of the custom bullets are not made with particularly tough jackets, with the deep rifling of the .303 rifles and the possibility of some rough throats, a tough jacket is kind of needed.

Case in point a fellow I know was having mediocre accuracy with sierra 174 grain .311 match bullets. He went to a similar load with some Russianicon 182 Grain FMJ steel jacket bullets (.311) and the accuracy of the load was much more consistent. That was in a used No4 MK I match rifle with what appeared to be a decent throat.

Not to say there would not be a market, with the many new and like new 1950s No4 MK II rifles, a decent flat based 174 gr MK VII equivalent bullet a lot of folks would be interested, but at 63 cents a bullet few would buy, given that the Hornaday 174 gr FMJ .311 bullets are around 28 to 31 cents per 1000 and seem to shoot fairly well in the new No4 MK II rifles.