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OP: Make sure you have adequate neck release....

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That's the deciding factor. Load a cartridge with a pistol bullet and shoot it with a moderate load, say a 158 grain bullet and 46 grains of IMR 3031. Then check to see if a .358" bullet slides easily into the neck of the fired case. If it does, then you're set to go. The actual barrel measurement is unimportant, since the bullet will be sized to the barrel dimensions before it has travelled its own length in the barrel.

Neck release is another matter altogether. If you don't have enough neck clearance in the chamber, the bullet may fail to release, causing an enormous pressure rise with unpredictable consequences.

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Good advice for sure, except the OP is asking about a barrel he found that has not been mated to an action. He's not going to be able to fire a cartridge at this point.

I am successfully using standard .358" bullets in my 9x57R double rifle.

I did a chamber cast that included the first inch of the barrel. Measuring the cast assured me that the groove depth would accommodate a .358" bullet and the chamber neck is plenty large for proper bullet release. Do a chamber cast to get the information you want. I don't think you will need any Lee sizing dies.

Curl

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Good post. This is not surprising. Seems many Euro rifles of the day were over-bored and I don't think it was a mistake. Seems the idea then was to allow some tolerance to keep pressures down, and with deepish rifling accuracy was fine as long as bore diameter was tight enough {giving depth of rifling}. Accuracy demands were not what they are today but even so, such rifles may shoot very well especially from field positions.

Over on the AR15 forum I ran shooting Challenge thread for years. 15 shots, 3 minutes, 100 yards, no prone, no bipod, no bags, no rest, no sling. May stand, kneel, sit. Very revealing and a few things were displayed; 1} precision rifles often did NOT demonstrate their mechanical accuracy advantage 2} most folks, at least Americans, don't like to shoot without a rest and aren't very good when they shoot without one 3} field position shooting is a heck of a lot of fun. There was also a bench rest Challenge going on at the same time. Very few of the Bench guys shot the field position Challenge. It was two totally different crowds with only a little crossover. I'd love to have shot that Challenge with one of those little Three-Seventy-Five Manlickers!

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