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Joined: Apr 2007
Posts: 32,312
Campfire 'Bwana
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OP
Campfire 'Bwana
Joined: Apr 2007
Posts: 32,312 |
Just had to switch lots of 7828 and my first trip to my 900 yard spot after switching seemed to indicate my drop dope was no longer valid. I'm no great reader of conditions and it could've been as simple as a downdraft I wasn't seeing... but... it made me curious. So, have you seen enough variance to matter when switching powder lots, and if so, how much did you see and with what powder(s)?
The CENTER will hold.
Reality, Patriotism,Trump: you can only pick two
FÜCK PUTIN!
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Joined: Sep 2004
Posts: 8,173
Campfire Outfitter
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Campfire Outfitter
Joined: Sep 2004
Posts: 8,173 |
What does your chrono tell you?
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Joined: May 2007
Posts: 550
Campfire Regular
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Campfire Regular
Joined: May 2007
Posts: 550 |
Had to drop down 2 full grains of RL 22 in a 300 WBY to get back to the same velocity, after getting a different lot #. It also happened with my friends 300 RUM. using the same type powder. Ron
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Joined: Apr 2007
Posts: 32,312
Campfire 'Bwana
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OP
Campfire 'Bwana
Joined: Apr 2007
Posts: 32,312 |
Muskeg, I haven't run it over the chrony yet.
Rshooter, thanks.
I've switched lots of 7828 with relative impunity for years so I wasn't that worried about it... I've even switched between 7828 and 7828 SSC and had my dope hold true out past 900... anyway, hoping to get back up later this week and see if the experience repeats. I'll report back. Hopefully it was just atmospherics that I couldn't see (no mirage on our overcast days)...
The CENTER will hold.
Reality, Patriotism,Trump: you can only pick two
FÜCK PUTIN!
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Joined: Nov 2007
Posts: 264
Campfire Member
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Campfire Member
Joined: Nov 2007
Posts: 264 |
As stated by RShooter I had 3 full grains different in my 300 WBY and RL 22. Same load but different lot was blowing primers and sticky bolt and 200 fps faster. Scared the crap out of me and I wont ever use RL22 again.
Everyone is pretty on the internet!
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Joined: Apr 2008
Posts: 1,976
Campfire Regular
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Campfire Regular
Joined: Apr 2008
Posts: 1,976 |
For me, it's worth loading and chronographing a few rounds upon opening a new keg, though differences I've found have been minimal. However, that may not always be.
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Joined: Sep 2006
Posts: 2,548
Campfire Regular
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Campfire Regular
Joined: Sep 2006
Posts: 2,548 |
I've found 7828 to be very consistent lot to lot.
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Joined: May 2005
Posts: 7,083
Campfire Tracker
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Campfire Tracker
Joined: May 2005
Posts: 7,083 |
I have seen up to 6% variation in Aussie powder but to clarify, this was before Hodgdon distributed them and also before burn rates were "tweaked" to align with the powders they were replacing.
It is like any other mass produced product, it will always improve as time progresses. Handling of the powder after purchase likely produces more variation lot to lot, even within the same can, especially when you ever have to screw the cap back on. Better to use the whole can and load a batch lot. John
When truth is ignored, it does not change an untruth from remaining a lie.
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