Anyone ever used these, they have been around for a long time. I tried the 303 chamber insert in 32 acp and 32 S&W in a few early Mark 1*** rifles, a few were very accurate at pistol range distance. The 32 acp was better with the jacketed bullet. Also tried the 30-06 in a few four digit Springfield 1903 rifles, the 32 acp was a little better too. The 22 rim fire in the 223 chamber insert has a small firing pin inside. It works very well in my AR-15, I just do not like extracting the steel insert. You could ream the 303 or 30-06 insert to use the 32 S&W long. They make a 30-06 insert chambered for the 30M1 carbine tooInformation
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