The momentum of a 124gr bullet going 1100fps (Georges original load) equals a 147gr bullet going 930fps'ish.
If you want to feed it a steady diet of heavy fast bullets a stiffer mainspring is a must but in reality it was never designed for heavy metal. If you want a crap shooter that will take any beating the go Glock.
A fine antique needs a little fiess/delicatesse so spend the extra dollar or two and feed it the right ammo and enjoy ;-)
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