Ammunition & Hand Loading > Cartridge and Shotshell reloading

Extreme Velocity Spreads

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AWick:
What were your 4 steps of lengths of the overall cartridge? Do you think the last length was feeding into the chamber differently or contacting the front of the rifling and screwing things up?

It looks like your first group seemed spot on! Maybe try another set with that set up and see if you can replicate your success. But I guess then you wouldn't get the joy of still searching for that perfect load :)

M7025-06:

--- Quote from: RLMoeller on August 04, 2013, 02:15:35 PM ---Sounds like you know what you are doing with chrono.   

I misread the original post, I thought it was the 3rd group that was varying for some reason.

Since you asked about powder,   Did you weigh each charge?


--- End quote ---

Yep...each charge is weighed before going in.



--- Quote from: AWick on August 04, 2013, 03:03:51 PM ---What were your 4 steps of lengths of the overall cartridge? Do you think the last length was feeding into the chamber differently or contacting the front of the rifling and screwing things up?

It looks like your first group seemed spot on! Maybe try another set with that set up and see if you can replicate your success. But I guess then you wouldn't get the joy of still searching for that perfect load :)

--- End quote ---

I usually neck size all of my once-fired brass, but since these were the fourth firing, I full length sized this brass, measured for length, and trimmed to 2.530'' (+/- 0.003''). 

I might try 2 sets of the same load & seating depth as set #1, neck sizing one set and full length sizing the other to see if that makes a difference.

As much as I'd love to have consistent 3000-3100 fps out of this load, out of the 3 manuals I have with data for a 140 gr. soft point (Sierra Gameking is what I'm using), not a one shows 3000 fps with a full dose of IMR-4350.  In fact I'm 0.2 grains over max according to Sierra's manual, but 0.3 grains under max per Lyman's 49th Edition.  That's what has me thinking something's not quite right when my chrony's showing me these high velocities (+3000 fps).

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