New Guy here. Considering straightwall wildcat.

Not in Michigan, it must have an oal of 1.8 or less


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OP said he was in Ohio.

I’m not sure exactly how much body taper they allow but there’s really no such thing as a cartridge with truly parallel walls. I’m just not sure exactly how much taper they allow, or if it’s even codified anywhere.
 
A gun shop in nw Ohio was working on a 30-06 trimmed like you suggest and it was loaded with a 44 caliber bullet. It was called 44 Predator. I think they are out of business now, but that is what I recall of the concept.
 
444 Marlin in a single shot with a 24in barrel, throat it to load the cartridge at 2.800, would get it done. Use the 250gr Cutting Edge maximus, load the case with as much CFE-BLK as you can... should be 2650fps or so. That puts you at 1630fps at 400y. Cutting edge wants 1300fps for that bullet.
The $350 CVA would work for this, just have the chamber throated.

Could also do something like a 45-90 with a similar bullet in modern break action, same powder, and run it up to 65kpsi. Gets you to 400y.
 
You need to look into the .41 Great Lakes. Kicks like a .350 legend but thumps like a .450 BM. Available in bolt actions and I believe it’s designed off the .30-06 case
I'm aware of this option, but I'm not sure if it offers any benefits over the 400 Legend?
 
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700 Nitro Rimless? 1000gr cannonball @ 2000 fps. it shoots surprisingly flat.

seriously though, I did a 458x2"/450 Marlin a few years ago. It's nearly(low pressure) 45-70 performance from a short action.

can be made from any Win Mag belted brass.
 
If there isnt an OAL restriction, seems like a .308 straight wall about 5" long would work well, or however long it needs to be to push a 180gr bullet to 2650.

A smokeless muzzleloader would work. Wonder why that hasn't been done yet?
 
Lots of great food for thought so far!

A few more things to think about...

I'm not aware of any restrictions on case taper in Ohio, it just can't have a shoulder.

I'm curious if taking a .375 Win, or even the .40-90 Sharps and loading it with a bullet like Barnes LXR would do the trick? Assuming it would take a modern action and barrel to handle pressures, but what might be the results of this?

Also, being very new to the wildcat scene, I don't really know what all is possible. I know a case can be be fire formed to a larger bullet, but is it possible to re size a cartridge to some thing smaller? and still maintain a straight wall? Thinking down the line of a .444 Marlin downsized to take a .40 bullet. Possible, or no?
 
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