OldVet seeking help/info on wildcat cartridge
Basically, it is a .223 case necked up to take a .243.6mm bullet. Anyone have any experience/first-hand knowledge with it?
I have two .223 rifles, a Rem 788 and an AR, and long ago fell in love with the little round. However, I've never considered it more than a very effective varmint round and, frankly, have become a bit bored with it.
I like unusual calibers, the .30 Herrett being one of my favorite. It's basically a .30-30 Short for the uninformed. I don't mind the extra work to "roll" my own ammo if that's what it takes.
One of the advantages of the AR design is its ability to change calibers by simply swapping uppers, 5.56 to 300 BO for instance. I'm under-impressed with the 300 BO. I passed on the 6.5 Grendel because while adaptable to any AR-15 lower, it requires a different BCG and magazines as well.
The 6x45, on the other hand, requires only a barrel change. Standard 5.56 BCGs and magazines are GTG.
Making ammo is as simple as running .223/5.56 cases through a 6x45 resizing die and loading it like any other round. And 5.56 cases are readily available for conversion.
The problem is, no one makes a 6x45mm upper, at least not that I can find, and where I can find a barrel, it runs $300-350. Then I'd have to build a separate upper because I don't want to break down my 5.56 upper to convert it. That means a much higher price just to shoot an unusual caliber, more than I care to spend for a rifle that will be range use only.
An alternative is to pick up a Henry single-shot rifle (the old H&R model) in .223 and have it bored to .243. I'm not sure if that can be done or who could do it. The single shot would have several advantages, one being it could have more free bore to accept longer bullets and longer COL rounds that the AR magazine won't allow. I find the rifles running around $350 online.
So my question is (finally), does anyone know who may be able to re-chamber and re-bore a finished .223 barrel to .243, and what it might cost to do so?