I think it's a great idea, especially the bullets. Right now IMO there is a big hole for a good LR hunting bullet that is accurate, has a high BC, and is a reliable effctive killer.
The best bullet in the 30 cal range is by far the GS HV 177, but it is hard to get and very spendy...
GS CUSTOM BULLETS - Specifications for use
I think you should study these bullets and if you can come up with an equivilant of the 177 in each cal and sell them for a reasonable price you would be swamped. The 177 works in a 1:10 twist (borederline) which is a standard .308 cal twist If you could also come up with say a 190 with AN even higher BC of .7 or higher that worked in an 8 or 9 twist. that would be real popular too.
The GS 177 bullets, get better velocity, have a high BC, and expand down to 1600 fps, and are very effective killers.
You might give this thread a good read...
The Solid Bullet Debate