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Good fathers day at the range

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/18/2017 at 21:46
sucker76 View Drop Down
Optics Apprentice
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The good part:
A friend and I went to the range today.  Before today the farthest I have shot was 300 yards.  We went right to 600 yards and aimed for the 24x24 inch steel plate.  I was 5 for 5 on the plate first time out.  I was pretty stoked. 

My rifle was Savage 12LRP 6.5Creedmoor.  Ammo was Hornady Precision Hunter 143gr ELD-X. 
I knew velocity of 2783fps and entered into Strelok and dialed 3.5mils and was dead on.  It was a hell of a great feeling. 


The bad part:
The picture shows Prime ammo which I got because it was highly rated.  130gr BTHP.  I was using a ProChrono.  I started shooting the Prime ammo with a cooled barrel.  Here's the problem; The velocities for 10 shots have an ES of 475 and SD of 169!
I shot 4 rounds in about 6 minutes and the velocities were 2943, 2943, 2962, 2976.  I then stopped to talk to some guys at the range for about 10 minutes with ammo out of rifle and chamber flag in.  The next 6 rounds were 3182, 3220, 3418, 3129, 3384, 3212.  Velocities are in shot order. 

The case necks looked about the same for all of them.  The 3418 one did look a little more sooty.  Shot in order from left to right.


The case heads looked OK too.  No typical signs of over pressure.  Shot in order from left to right.


So my question is what happened?  Why did the velocities go way up after a short break in shooting?  Did the heat just soak into the barrel and lead to higher velocities?  Do chamber flags block enough air flow to cause this problem?

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/19/2017 at 07:09
Dogger View Drop Down
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Sounds like you had a good day out, congrats on your shooting.  I'll defer to the experts here on your velocity questions though.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/19/2017 at 07:48
Rancid Coolaid View Drop Down
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You went from 2900 to 3400 with no appreciable brass signs?
I would think you'd feel that difference on the gun.

If the brass looks the same, I'd wonder if it was a chrono issue. The shooting position looks to be in shade so ammo did not heat that much, right?

Edited by Rancid Coolaid - June/19/2017 at 08:54
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/19/2017 at 07:49
Rancid Coolaid View Drop Down
Optics Jedi Master
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I would also contact Prime and ask them.

and let us know, I just bought a few boxes of their stuff!
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/19/2017 at 08:22
koshkin View Drop Down
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Did the POI change?

I would check the chronograph first.

ILya
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/19/2017 at 09:42
sucker76 View Drop Down
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I thought of chrono problems too.  No large difference in feel or POI shift.  All 10 rounds were in about 1.25" at 100 yards.  The chrono was about 8' from the rifle which is about where I usually put it.  I'm trying to think back if both sensors were in the shade or not. 

I'll contact Prime later today to hear what they say.  I have looked around for anything close to my issue and have read nothing on it. 

By the answers I'll assume the consensus is not a barrel heat problem. 
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