Group variation
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ChrisF
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Group variation
All things being the same i.e.: bullet compression wads brass has anyone noticed variation in groups between different powder lots?
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Dennis Armistead
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- Location: Payson Arizona
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Re: Group variation
Yep... but rarely with Swiss. IMOP.
Dennis
Dennis
Experience trumps intelligence every time.
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desert deuce
- Posts: 3863
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Re: Group variation
I notice group variation day to day with the same lot of powder in ammunition otherwise loaded the same.
Things other than rifle condition and ammunition affect group variation.
Things other than rifle condition and ammunition affect group variation.
Sometimes you get the chicken, and sometimes you get the feathers!
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Coltsmoke
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- Location: GA.
Re: Group variation
I have found my loads can change as much as a couple of grains one way or the other when changing powder lots. Small amount of testing and I'm back on. Might have to add or decrease compression a little bit. Swiss usually doesn't take much to get it going again if anything at all.
Normal isn't coming back, but Jesus is.
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ChrisF
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Re: Group variation
Thought I was going bonkers but I guess not!
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Clarence
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- Location: Hill Country, TX
Re: Group variation
Chris,
When changing lots of powder, I start with the same volume as the old lot. If it doesn't shoot the usual tight groups (when I'm shooting well and under good conditions), I make small adjustments to the powder volume--on the order of a grain or so, and generally find a load that gives similar good accuracy with only 1-2 tries.
As an example, my last lot was a bit less dense (lighter weight for the same volume), and I added ~1 grain, working by volume. I have a brand new lot and will go through the same process with it. If it is more dense, I will probably decrease the volume slightly if the initial tests aren't to my satisfaction.
Clarence
When changing lots of powder, I start with the same volume as the old lot. If it doesn't shoot the usual tight groups (when I'm shooting well and under good conditions), I make small adjustments to the powder volume--on the order of a grain or so, and generally find a load that gives similar good accuracy with only 1-2 tries.
As an example, my last lot was a bit less dense (lighter weight for the same volume), and I added ~1 grain, working by volume. I have a brand new lot and will go through the same process with it. If it is more dense, I will probably decrease the volume slightly if the initial tests aren't to my satisfaction.
Clarence