According to Shooting Times.......

The New ’73 Up Close
The Achilles’ heel of the Winchester ’73 is its mechanical lockup. Like the Henry Rifle and Winchester ’66 before it, bolt lockup is achieved via a simple toggle mechanism rather than any sort of crossbolt. Excessive pressure can distort toggle pins and create excessive headspace. While it is strong enough to support the .357 Magnum–and the new Winchester ’73 is chambered for it –the lockup is arguably too weak to handle the .44 Magnum or modern, high-pressure .44-40 loads. The accuracy results are listed in the accompanying charts. If pressed to choose one jacketed factory load for all-around use, I’d go with the Remington UMC 125-grain JSP load; it was second-best shooting and came out of the rifle’s muzzle at a rather impressive 2,174 fps.

Read more: http://www.shootingtimes.com/rifles/winchester-model-1873-rifle-review/#ixzz4ZAQ5gLdO


So does this mean one can load the 44-40 up to 20k - 30K PSI (max for the 357 is 35k) safely and fire it?

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