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Post subject: Re: 22-250 COUNTACH
Het hom so bietjie gas gegee en metplat vergroot, nou moet ek net n vars voel soek.
Gebruik scented candles. Jou herlaai kamer gaan ten minste lekker ruik.[emoji23]
DD, ek dink jy is nou op verkeerde spoor. Jou doel met die geweer was om hoë BC varmint tipe koeëls teen 'n goeie spoed te skiet spesifiek vir kopskote bedoel. Nou sit jy met 69gr Lapua koeëls (BC .341) wat 'n harde koeël is en jy maak die meplate groter en sagter in 'n poging om die koeëls se verrigting te probeer verbeter. Die groter meplate gaan waarskynlik jou BC afbring na onder 0.3, dan kan jy net sowel 53gr V-Maxe skiet behalwe dat hulle waarskynlik gaan opbreek met die 1 in 8 groefdraai. Ek het tydens vorige eksperimente met die Labradar gesien hoe groot die effek van die meplate op die BC is.
Ek dink jy moet teruggaan na Rapala en hulle oortuig om jou geweer aan die skiet te kry met een van die volgende: 73gr, 75gr of 80gr ELD-M of 75gr A-Max, al die ander gewere skiet tog die betrokke koeëls mooi solank die groefdraai reg is. Indien die Sabatti se tipe loop nie kan werk in 224 kaliber met die betrokke tipe koeëls nie, dan moet hulle jou loop vervang met 'n loop wat wel die werk kan doen - jy het hulle tog van die begin af gesê waarvoor die geweer gebruik gaan word en hulle het beslis nie vir jou daarop gewys dat dit slegs Lapua koeëls kan skiet nie.
Dit was my versoek toe die geweer vir die tweede keer terug was maar hulle het my ingelig dat hulle nog n Sabatti loop gaan op sit en toets. Terug gestuur met die lapua ladings as bewys dat die geweer skiet .
Ek is seker hulle lees ook hier maar hoor niks van hulle nie.
I am happy to report that I was able to get to speak with Mr Mark Pledger from Rapala this morning and he has agreed to test the rifle with 73gr 75gr and 80gr varmint type bullets in the 3400-3500fps speed range.
DD, ek dink dit is 'n goeie verwikkeling, hopenlik sal hier 'n gunstige uitkoms wees.
Ek dink net jy moet die minimum spoed vereiste afbring na so 3200, veral met die 80gr koeëls in gedagte.
Die 80 gr koeëls is vir my n last resort aangesien hulle nie gereeld beskikbaar is nie 73gr en 75gr koeëls is wat ek aanvanklik in gedagte gehad het.
Miskien kan Dale vir my kyk wat die teoretiese nodes vir 80 gr amax sal wees met n 540 ,ek dink s365 lot 89 is ook geskik vir die 80 gr koeëls
Posted: Tue Jul 03, 2018 6:55 pm
I have to make a few assumptions here so this predicition may not be quite accurate so take it as a guideline only
Assuming the same COL (63.60mm) and burn rate factor as the Lapua Scenar 69 grain bullets
Node 4 would be at roughly 3080 to 3100 fps at 56000 psi
Node 3 would be roughly 3220 fps but at 67000 psi
The above with 80 grain A-Max bullets
Last edited by Dale SH on Tue Jul 03, 2018 7:02 pm, edited 1 time in total.
S365 will get you to a +- 3200 fps accurate node within safe pressure
Posted: Tue Jul 03, 2018 7:52 pm
That's wat I reckoned the n540 is burning to fast for the heavier bullets.Just for comparison what would the node be for the 69gr scenar with the s 365 lot 89?
+- 3490 fps with the default burn rate @ +- 54800 psi
+- 3460 fps with a heavily inflated burn rate @ +-56500 psi
Rapala said their load with the n540 34.7 gr and 69 gr scenar was predicted to at 55000psi ??
Dale what would the tpl be for the 80 gr amax bullet if only 5.5mm of the bearing surface is seated into the case?
The max tpl for the 75gr amax is 69mm.
Posted: Tue Jul 03, 2018 8:52 pm
@3505 fps ?
Apologies. Disregard this.
It is for the 69 grain Scenar
For the 80 gn ELD M would be 65.3mm
Last edited by Dale SH on Tue Jul 03, 2018 9:02 pm, edited 1 time in total.
For the 80 gn A max would be 67.8mm
Ok that still gives 1.2 mm jump theoretically.
Apologies again. I used the 80 grain A max instead of ELD-M
COL with 5.5mm of shank in the neck would be 65.30mm with the ELD-M
You wont necessarily have 1.2mm jump as the two different bullets have different ogives.
You will need to measure max COL in your chamber with the ELD-M
No worries this is an academic exercise ,lets see how they fair with the varmint bullets
Rifle is so used to travelling when I removed the scope it jumped in the hard-case by itself .This thread is going to be quite for a while .
Do you intend using the A Max or ELD-M ?
The amax appears to have been replaced by the eldm in production so I would prefer that the rifle would shoot eldm in 73gr or 75gr and from my experience it wil only do so at velocities below 3200fps.
Hou ons op hoogte wat gebeur