My understanding is that it comes from using heavy loads in "break action" muzzleloaders. I did have a GPO Passion 3x9 that lost ability to hold zero after around 50-70 shots from my Patriot. Now the Patriot is very light weight and I was shooting 78gr. by weight loads of BH209 and a 270 gr. bullet to bore out of the .45 cal Brux. This was a brand new scope, installed in the Woodman 1" ring and base setup. I have never used a lead sled, this was me shooting off my homemade sandbags only. I can't really say much about the GPO's ability to withstand recoil, but in this case it didn't hold up well.
Which made me sad, because I really like the scope overall. It has great eye relief, a constant 4" and was very clear optic, outstanding in low light ! I will probably put the replacement they sent me on a .204 Ruger that needs a scope right now since I stole it's Leupold for the Patriot.
By the way, since I installed a Leupold Vx3i 3.5-10x40 on the Patriot I have had no problems with it after a 100 or more rounds thru it.
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