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A copper jacketed bullet will usually not expand to completely fill the bore.

Any time you increase the bullet diameter, pressure will increase. So be careful!!

For the .303 Lee Enfield, try the 180 grain Hornady .312" bullet. I've used this bullet in the 7.65x53mm. It shoots well for me.

The Oehler chronograph folks offer a piezoelectric transducer system. The thing works with the Model 43 chronograph. The transducer is glued to the chamber of the rifle and you can use this system to measure pressure accurately. But I know of no other way that the average guy can measure pressure accurately.

If I remember correctly, Ross Seyfried tested this system for Guns & Ammo magazine back in 1990.

Check this out:

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