Quote:According to the original plan, when development was completed the cartridge was to be adopted by Winchester as a factory round. At this point the facts become cloudy. Winchester did indeed introduce a high-velocity .22 in 1935 and even adopted the name Wotkyns had been using for his wildcat: the .220 Swift. But instead of the .250-3000 case, the new Swift was based on the 6mm Lee-Navy, modified somewhat for added strength and semirimmed. Why? No one knows. The records are lost, the principals are dead, memories are dimmed.
Understandably infuriated--he later refused to discuss the Swift--Wotkyns continued work on his brainchild, drawing in a noted handloader, J. Bushnell Smith, and a gunsmith and shooting champion, Jerry Gebby. Together they perfected the ".22-250" design, developed loads, built rifles and even copyrighted a name for it: the .22 Varminter.
That was in 1937. Phil Sharpe became involved when Gebby built him a rifle for the new cartridge. Since by this time Sharpe had been working with Winchester's new Swift for more than two years, he was in a good position to judge the relative merits of the two cartridges. The first thing he found was that the Varminter was far more flexible than the Swift.
"[The Swift] performed best when it was loaded to approximately full velocity," he wrote, whereas, "The Varminter case permits the most flexible loading ever recorded with a single cartridge. It will handle all velocities from 1,500 up to 4,500 fps."
Well it looks like they were able to acheive 4500 fps in developing the .22-250 in 1937. Now with better powders and bullets when the case is opened up with the AI chambering it seems quite possible.
Quote: About 1937 a man named Gebby and an associate, J.B. Smith completed the work on the wildcat 22-250, simply the 250 Savage case necked down to .224 with a 28 degree shoulder. Some years later, P.O. Ackley increased the 22-250’s case capacity by re-forming it by almost eliminating its body taper and giving it a 40 degree shoulder. Case capacity essentially duplicates that of the 220 Swift.
This text is based on information from “Cartridges of the World”, Hodgdon reloading manual, the cartridge designer and/or own resources.
I don't think there is any doubt the pressure is maxed.
as far as the 35 gr berger bullet, well it is certainly lighter than what I like to shoot for coyotes. There are a lot of guys shooting this weight of bullet and smaller for coyotes. IT is used in these tests obviously to demonstrate velocity. The heavier bullets used are also exibiting high velocities.
I didn't create these test results but similar findings are found at different sources and in other .22 chamberings so I am not instantly a naysayer or doubting a post strongly on nothing. Can someone prove it can't be done.
