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What kind of rifle/barrel are you using? I'm intrigued by the .300 Whisper; it's going to move near the top of my short list when I move to a free state where I can own a can.
I had a Savage 112 varmint model rebarreled with a Shilen super match barrel.
I had the barrel left over from an abandoned project and started thinking. You know how that goes. A new Shilen #6 contour supermatch barrel goes for a bit more than $300 these days
I bought a PTG reamer and headspace gauge from Midway and an action wrench and barrel blocks from a source that I've since forgotten, total for the tools was about $175.
I still have the original barrel and could easily reinstall it if I wish.
The original .223 magazine does not feed the 30-221 so I single load them.
It is just not important to me that the mag works so I didn't bother with it.
One of thesse days I will make a single shot adapter for the mag.
I started with a .223 so did not need to change the bolt head. If you have another sized bolt head, you can get a replacement from Savage for abut $40.
The dies are CH4D and about $100 for a dies set with a file trim die.
I have been using the file trim die only to preform the cases and am rough trimming on a bench lathe and finish trimming on a Forster case trimmer.
The 300 Whisper is trademarked and only available from a single source.
The 30-221 is freely available. There is a slight difference in the chamber dimensions. The 300 Whisper is intended to be formed by expanding .221 Rem brass and has a tight neck. The 30-221, despite the name, is intended to be formed from the body of .223 or 5.56 brass and the chamber neck is a couple of thou bigger so you don't have to neck turn the brass. There is also a 30-223 which is a completely different cartridge.
I bought the tools as I figured that the gunsmith would charge me for them anyhow, so I might as well own them.
The gunsmith charged me $100 to turn, thread, shorten, crown, ream the chamber and install the barrel. He did an awful lot of work for not too much money. He did a very nice job of it but I did have to relieve the barrel channel in one spot where the stock touched the barrel.
I only had the gun out a couple of times before I fell and broke my arm, but it seemed like it was going to work very well. I started with a 173 gr cast bullet over 8.0 gr of 2400. I did not chronograph them but estimated the velocity at around 1100 fps. When I have recovered enough to shoot and cast bullets again, I'm going to try the 200 gr Lyman 311299 cast bullet.
Subsonic loads in the 30-221 are about as quiet as a .22LR so a silencer is not an absolute requirement
Jack