I can't give opinion and the only experience I have that "might" relate is the catastrophic barrel failure on the family VH with Vulcan steel barrels. I say "might" as the barrels had rattled around a car trunk for years, causing some dents. My Dad bought it in 1952 and also reloaded "hot" for those long shots, a probable cause for some barrel bulges. The gun only saw 2 3/4 inch hulls, either Canucks or Imperials when commercial ammo was purchased. I removed all the dents and bulges in the late '70's and I continued to use the gun until 2003 when the barrel blew. I had been using low pressure commercial 2 3/4 shells but I also had a bunch of re-loads from a friend who got out of shooting. I had only used those in a Winchester pump or SKB XL900 auto (my backups). Unfortunately, I had some of those in my jacket and forgot I was not using them in the Parker. Who knows exactly why the barrel blew. I tend to think it was due to the dents/bulges causing a fatigue issue.
I recall another member wrote on the pressures involved and the "slight" increase created by 2 3/4 shells due to the crimp entering the forcing cone when fired. Maybe that could be found on the old site if those threads still exist.
Regards,
Jack
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