O'Connor's own Minar-Sukalle 7x57mm was re-barreled at least once, according to several published accounts. O'Connor says he got rid of it because 139 gr. 7mm bullets left a gap for gases to wear out the barrel's throat. So if he sold it in 1940 because the throat was wearing out and it was becoming inaccurate, the new owner (Alfred Ronstadt, according to Anderson) might well have had it re-barreled yet again.

Last edited by David Zincavage; 03/05/16 10:30 PM.