The barrel is not the problem. The problem is that semiautos of that era were not built for the battering that excessive use of +P ammo may give them. Recoil springs aren't heavy enough, frames and small parts not beefy enough, etc. Occasional +P probably won't hurt anyhing too much, but why bother? There are pleny of fine standard loads out there. I use the classic Federal 9BP 115 gr. load in mine, a proven performer that is a standard-pressure load and very accurate.
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Pisgah
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