QL hulp : "Humble" 6.5 cm

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cloots49
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QL hulp : "Humble" 6.5 cm

Post by cloots49 » Wed Mar 18, 2020 9:47 am

Hi manne

Nou dat ons besig is wil ek sommer n paar toets ladings vir my lang roer ook laai ;D

Kaliber : 6.5 creedmoor
Loop lengte : 24" of 609.6 mm BB
Max TPL :73.45 mm
TPL : 71mm ( ver van lands af)
Kruit : VV N550
Dop volume : 51.86 gr
Punt : Hornady ELD X 143 gr

Ladder test geskiet

grain fps
37.5gr 2507
37.3gr 2522
37.1gr 2532
36.9gr 2517
36.7gr 2483
36.5gr 2476
36.3gr 2476
36.1gr 2449

Sal graag n node rondom 2700 wil na jaag

Nog maals dankie

Dale SH
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Re: QL hulp : "Humble" 6.5 cm

Post by Dale SH » Wed Mar 18, 2020 12:06 pm

Shoot a 39.0 grain load and you should be around 2650 fps.
Give us the details of the 39.0 grain load and we can fine tune it.
Your H20 volume is low.
What cases are you using and is this a fire formed volume or virgin cases ?

I am assuming these velocities are measured with a magnetospeed or Labradar.
Brno No 2 .22LR
Tikka LSA55 .243 Win
Voere 6.5x55
Brno ZKK600 Deluxe 7x57
Ruger 77MK2 30-06
Ruger Hawkeye African 9.3x62

cloots49
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Re: QL hulp : "Humble" 6.5 cm

Post by cloots49 » Wed Mar 18, 2020 12:37 pm

Hi Dale

This is lapua srp virgin cases where H20 volumes was measured after first firing
The speed was measured using a labradar.

Dale SH
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Re: QL hulp : "Humble" 6.5 cm

Post by Dale SH » Wed Mar 18, 2020 12:41 pm

I hear you but maybe measure again.
All the predictions I have done with Lapua SRP cases tell me your volume should be between 52.2 and 52.6 grains H20.
Brno No 2 .22LR
Tikka LSA55 .243 Win
Voere 6.5x55
Brno ZKK600 Deluxe 7x57
Ruger 77MK2 30-06
Ruger Hawkeye African 9.3x62

cloots49
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Location: Pretoria Oos

Re: QL hulp : "Humble" 6.5 cm

Post by cloots49 » Wed Mar 18, 2020 1:26 pm

Will do and give you feedback Dale

cloots49
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Re: QL hulp : "Humble" 6.5 cm

Post by cloots49 » Sat Apr 04, 2020 11:02 am

Hi Dale

Remeasured the case volume and only got 52.02 grains. I don't know if that is a problem.

I also shot the load of 39.5 grains and this got me a speed average of 2673 with an ES of 23.
The grouping was decent but not yet where I want to be.

Is there a node a bit closer 2700 fps or just above?
Any further recommendations will be appreciated.

Thanks
Cobus

Dale SH
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Re: QL hulp : "Humble" 6.5 cm

Post by Dale SH » Sat Apr 04, 2020 11:21 am

Good morning.

Your current accurate node with the latest data supplied is 39.1 to 39.2 grains for 2650 fps at the muzzle.

I do not believe you will get to this next node within safe pressure so I am not going to recommend it.
Brno No 2 .22LR
Tikka LSA55 .243 Win
Voere 6.5x55
Brno ZKK600 Deluxe 7x57
Ruger 77MK2 30-06
Ruger Hawkeye African 9.3x62

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