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If you have access to a Bridgeport mill, even the infamous slanted windows on a PDI become easy to R-hop or extend for flat hopping.
Asking for a range increase estimate is like telling a doctor, "If I eat one serving of broccoli every day for the rest of my life, how much longer will I live?"
You haven't given us enough information. We need to know what ammo you are using, both weight and brand/quality. We need to know what energy output your gun is shooting. We need to know if compression is perfect.
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