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Caveman2
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1st shot slow
Aug 28th, 2021 at 6:24pm
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I've been playing with my new toy, a chronograph. Wish I'd bought one years ago.

I have a 7x57 and a box of 139sst and a box of 140 pro hunters.

The pro hunters are always around 150 -200 fps slower on the first shot of the day.

The SST shoot normal speed right from the get go.

Interestingly the Pro hunters shoot .5 of an inch better groups than the sst.

Sst also gives around 100fps higher velocity in general but that in it self is no big deal.

Just curious in anyone's observations about changes in velocity from a cold barrel to a warm one.
  
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Re: 1st shot slow
Reply #1 - Aug 29th, 2021 at 4:48pm
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What sort of Chrono did you buy. I wish I had the $$$ for a Lab Radar - Iíve used one once and was smitten.
  

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Caveman2
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Re: 1st shot slow
Reply #2 - Aug 29th, 2021 at 6:04pm
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No lab radar sorry, just your budget Pro Chrono DLX.

I have documented it 3 times with the pro hunters and have seen more than that but hadn't made the connection with the bullet.

If components weren't so damn hard to get at the moment I do some more testing but reluctant to get to carried away at the moment.

I tend to pay attention to the first shot off a cold barrel cause when hunting I only tend to get one shot (if I'm lucky)

  
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shananah
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Re: 1st shot slow
Reply #3 - Sep 13th, 2021 at 9:40pm
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Is this maybe the difference between 1st shot with a clean barrel & subsequent shots with some fouling? Maybe try a fouling shot before your recorded shots, then you will know if I'm talking out of my back side or not.  Grin
  
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Caveman2
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Re: 1st shot slow
Reply #4 - Sep 14th, 2021 at 3:32pm
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It's possible. Thing is it only happens with this bullet.

I have other bullets so have decided to park it until powder and bullets supplies aren't so tight.

I suspect it's due to the greater bearing surface and thicker jacket of the bullet and maybe my barrel is marginally tighter than US spec barrels.

Then again I am more likely talking through my arse as well, hence the question.
  
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