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Not exactly your situation, but I have generally found factory ammo to be slower than advertised in real hunting rifles. Not as much as you have observed, however. How long is your barrel? The ammo company probably tested in something like a 29" tube. They probably are selling "lawyer loads" as well, so I'm not surprised your handloads are quicker. My loads in various calibers vary from slightly faster than manual to 300 fps slower. Every rifle is different, especially older military rifles. Are your rounds accurate?
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