P.O.ing the 260.

Rabbitz · Post by **Rabbitz** » Sat Oct 27, 2018 7:00 pm

OK. This has been bugging me for weeks.

So I'll ask. P.O.ing? What does it mean?

kickinback · Post by **kickinback** » Sat Oct 27, 2018 7:14 pm

Rabbitz wrote:OK. This has been bugging me for weeks.

So I'll ask. P.O.ing? What does it mean?

P.O. Ackley

This best explains

https://en.m.wikipedia.org/wiki/P.O._Ackley

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Rabbitz · Post by **Rabbitz** » Sat Oct 27, 2018 7:44 pm

I thought he was AI?

But there ya go learned something.

kickinback · Post by **kickinback** » Sat Oct 27, 2018 9:53 pm

All loaded up for the next session. 5 rounds each 44gr 2209 srp&lrp

5 rounds each 45gr2209 srp&lrp

Velocities and groups to follow.

PS. Using the same 10 cases throughout this test.

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Ol 55 · Post by **Ol 55** » Sun Oct 28, 2018 5:32 am

kickinback wrote: ↑Sat Oct 27, 2018 9:53 pm All loaded up for the next session. 5 rounds each 44gr 2209 srp&lrp

5 rounds each 45gr2209 srp&lrp

Velocities and groups to follow.

PS. Using the same 10 cases throughout this test.

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When is the next session?
Gary

kickinback · Post by **kickinback** » Sun Oct 28, 2018 3:32 pm

Hopefully tomorrow night.

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kickinback · Post by **kickinback** » Mon Oct 29, 2018 4:58 pm

The facts

Targets were shot off a bipod on the tailgate.

Tikka t3 varmint, factory barrel with AI reamer run in, factory stock and Harris bipod.

No1 was shot without a rear bag Nos2,3+4 made use of a rear bag.

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kickinback · Post by **kickinback** » Sun Dec 02, 2018 8:47 pm

The latest
Same cases

Sm primer 47gr 2209

2906
2874
2889
2906
2892

Large primer 47gr 2209

2913
2933
2894
2905
2913

Sml primer 47.5gr 2209

2905
2914
2924
2900
2908

Large primer 47.5gr 2209

2964
2922
2937
2936
2942

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Ol 55 · Post by **Ol 55** » Sun Dec 02, 2018 9:36 pm

So where to now? Large primer?
Gary

kickinback · Post by **kickinback** » Mon Dec 03, 2018 5:48 am

Ol 55 wrote:So where to now? Large primer?
Gary

Still more room in the case

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trevort · Post by **trevort** » Tue Dec 04, 2018 5:35 am

Glen can you work out the neck diameter of your chamber by measuring the reamer out of interest

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kickinback · Post by **kickinback** » Tue Dec 04, 2018 5:05 pm

trevort wrote:Glen can you work out the neck diameter of your chamber by measuring the reamer out of interest

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I’m not putting the tungsten carbide contact surfaces of the micrometer on the cutting edges of the reamer

Fired cases measure .2985”

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kickinback · Post by **kickinback** » Tue Dec 04, 2018 5:10 pm

Of most interest is the case head diameter measurement. Large and small primer cases have both grown by .013mm

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Tony Z · Post by **Tony Z** » Tue Dec 04, 2018 8:48 pm

Why is half a thou case head growth of interest?
Minimal considering the velocities you are getting. Now if it were 0.13mm, that would be a concern.

kickinback · Post by **kickinback** » Wed Dec 05, 2018 5:27 am

Tony Z wrote:Why is half a thou case head growth of interest?
Minimal considering the velocities you are getting. Now if it were 0.13mm, that would be a concern.

It’s the same between the small primer and the large.

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AusVarmint

P.O.ing the 260.

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