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I have read several places that triple seven powder has a limited shelf life. Could this change the point of impact out of an inline rifle with powder that is only a year and a half old? This year I sighted my inline in with loose triple seven powder dead on at 100 yards in October for the early season. I took this gun out prior to rifle season to check it at the range and found my shots were still on left and right but were impacting about 8 inches high at 100 yards. Has anyone else had this experience? Could my powder have drawn moisture over time and gone bad (powder is roughly one and a half years old)? I have a quality scope on my inline so I don't think the scope is the issue. I also realize the shooter could be the problem, but I had just finished shooting less than an inch group with my regular deer rifle so I don't think that is the case either. Does anyone have any ideas as to what could cause this shift to a higher group?
 

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I can't comment on the powder because I never use anything but Goex. From what you have described I would suggest that you look to the firearm in terms of functionality and maintenance (all the stuff you read here about clean bores / tight screws -- yada, yada, yada).
If you have another ML rifle maybe try that powder in this gun and see how it performs as some sort of baseline test. If you have similar issues in another gun; then I think it's time to dump that 3x7 stuff and think of another fuel for your ML shooting.

Keep us posted.
 

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I have triple 7 pellets I came across 10 years ago. Still shoot fine, must store in dry conditions. I had bought 12 packs and never had a problem to date. Primers are another story, replace yearly
 

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I would think that you'd hit low with lost potency. I had an experience a few years ago where I was using my 777 pellets and the gun was shooting fine. I flew to Iowa to hunt with a friend, and since I was flying I couldn't take powder with me on the plane, so my friend who was driving in from another state brought 777 pellets with him. I was shooting 3 x 50 grain pellets at home and the recoil wasn't an issue. I got there, went to the range, and those 777 pellets he brought along all but laid me out from the kick! I'm guessing that my powder had picked up moisture, because I was shocked at the difference in the kick. Either they went bad, or else mine were not formulated properly because my friend was surprised that I was able to handle the 150 grains at home.

I like the idea of vacuum sealing!
 
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