Old Powder

[kwilson16]

What are the effects of using old (1-3 years) T7 pellets and granulated powder?

I am using up some old stuff and it's producing flyers (4-5" out of an otherwise excellent group). Is the old powder probably responsible?

It was stored in a clean, dry place.

[cayugad]

Old powder is just that.. old powder. You never know if it went bad or not. Actually if you shoot it over a chronograph, that is the best indication if the powder does not compare in velocity to new powder. If the powder was stored properly it should be fine.

Fliers can happen for a lot of reasons. Powder being one of them. It is hard to say if that is your problem or not.

[starbuck007]

did the powder have any clumps of powder in the bottle ? if it did i'd try some new powder.