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The Shadow (Super Mod)
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Considering it's a wildcat, you won't find any pressure tested data.

Loaddata has some loads from Ackley's books(circa 1962), AKA the 22 Rocket.

cheers
 

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Being a rimmed cartridge, I did all calibers on the British 303 case, and the performance of the smaller calibers was quite dissapointing! The 307 Winchester and 444 Marlin were and are to of the best cases to work with!

Variations of the 22-307 would, depending on the barrel, bullet and load, easily reach 4,200 to 4,500 fps. with superb accuracy.

Running the 22-307 Improved with a 1-7" twist and 80 gr. and heavier VLD bullets, it's 1,000 yard accuracy has proven to be quite phenomenal to say the least.

A
 

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303 Brit has almost exactly the same case and capacity. the 22-30-40 was a popular wildcat back in the day. You could use that data. As said P.O. first book is a welth of info on the old wildcats.
 

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I measured an empty 307 case, and ----

Being a rimmed cartridge, I did all calibers on the British 303 case, and the performance of the smaller calibers was quite dissapointing! The 307 Winchester and 444 Marlin were and are to of the best cases to work with!

Variations of the 22-307 would, depending on the barrel, bullet and load, easily reach 4,200 to 4,500 fps. with superb accuracy.

Running the 22-307 Improved with a 1-7" twist and 80 gr. and heavier VLD bullets, it's 1,000 yard accuracy has proven to be quite phenomenal to say the least.

A
I measured my son's 307 brass against fired 308 Win. brass. The large 30-30 rim's extraction groove lets the top extractor of the first Win. 307 carbines grab the rim, solidly. The downside is that there's so thick of brass around this extra wide groove, that it only gives this case the equivalent internal volume of the old 300 Savage cartridge. So it's only a 300 Sav. number. Ackley suggested using a 300 Sav. magazine spool for his 250 Ackley Imp. cases. A 22 version would be the 22-250 Ack. Imp. No slouch, but do you really need that semi rimmed case, when the old 220 Swift cases are still out there. My last purchase of cases for my son's 307BB, carbine were made for the 356BB. The 307 has become a real orphan, in spite of it's being a really neat woods rifle. JMHO.
 

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Max out the 307 Winchester's case capacity, and it is considerably more than that of the 300 Savage!

Run the 307 Winchester based wildcat cartridges to their full potential in guns like the Ruger #1 or Ruger M77, there is NO 300 Savage, 220 Swift or 22-250 Ackley Improved cartridge that can touch it!

A
 

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i'm looking for any load info for a 22-4000 based on a 303 neched down to 22
Email ADI powders with the basic case dimensions and what you are shooting it in and they should give you some were to make a start.

Cheers
 
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