Subsonic för .22 Hornet och .308

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Subsonic för .22 Hornet och .308

Inläggav Dejan P » 15 jul 2002, 18:28

Hej!
Jag fick följande från amerikat. Läs hela den finska länken med sina länkar. Här kommer ett litet utdrag.
Vänligen,
Dejan P


Swede,

http://guns.connect.fi/gow/QA1.html Go here – start at page 1 and go til you cannot – page 18.

http://homepages.ihug.com.au/~bkhornet/22hornet.htm


Subsonic .22 hornet loads
Dear mr. kekkonen, with interest i have read your dates about reloading subsonic ammunition. after good results with my Steyr PIV with B&T silencer, i want to 'play' with my .22 hornet, barrel 45 cm and different kemira powders. i have the program quick load, but i do not trust results in subsonic speed. Have you any experience in this caliber, can you help with reloading dates in safe pressure?

thank you very much for your help! best wishes, richard

Caliber .22 Hornet is among the most suitable ones for subsonic handloading. I have not personal experience in this very caliber, but a lot of knowledge. Why distrusting in the QUICKLOAD program?! It may give some incorrect information when some "odd sized" cartridges (like Weatherby Magnums) or cartridges (like .243 Winchester) inherently prone to generate Secondary Explosion Effect or at least hangfires, are loaded with reduced charges of rifle powder: A computer is unable to think or deliberate. It's user behind the keyboard or an operator clicking the mouse should carry out all the real brainwork. And I must repeat that .22 Hornet is among the least risky cartridges for "supu" loading, with certain conditions.

Do not use too heavy bullets! Those with weight 40 - 45 grains are O.K. A round-pointed flat-based bullet, weighing 50 grains may be still short enough to become stabilized in it's flight by rotational rate of .22 Hornet rifling. If you are able to acquire swaged or cast lead alloy bullets, use them for supu (subsonic) loads. Recommended weight is again 40 to 45 grains. A cast bullet LYMAN No: 225415 is about the ideal projectile for this very purpose. With the gas-check, it weighs usually slightly less than 50 grains. Suggested overall length of Hornet cartridge is 1.65 inches (42 millimeters) or slightly shorter (if needed) with this bullet.

Your powders may be of some "matured vintage", because Finnish KEMIRA Oy has not been the "mother company" of VihtaVuori powder plant since 1st January 1997. VihtaVuori is today a part of Fenno-Scandian explosives consortion, NEXPLO AB. For the supu loads with lead alloy or jacketed bullets are any of powders in series N300 suitable. "Cream of the cream" are powders N310 and N330. (Last mentioned is especially good for short-barreled rifles, equipped with a suppressor/ silencer). Suggested starting load for any & all recommended bullets is 2.0 grains (0.13 gram) with any kind of powder in series N300. You should "fine tune" your powder charge yourself. Please, note! Read the words "STARTING LOAD" literally. When you are developing the subsonic load for a .22 Hornet cartridge, the correct powder charge (giving truly subsonic bullet velocity and a good accuracy) may be some 1.8 or 1.9 grain of powder, but if needed, you may add the charge with 0.1 grain increments until the "whiplash noise" of transsonic or supersonic bullet is audible. Then you should reduce the charge one or two tenths of a grain.

Do not try to develope subsonic Hornet loads with ANY rifle powder, although the case volume is small. Reduced charges of rifle powders (even the quickly burning N110, which is good for full-power Hornet loads) shall not generate high enough chamber pressure for regular combustion. Surfaces of rifle powder kernels are usually coated with chemicals (deterrents), which shall reduce flammability of powder, and combustion of it until the coated surfaces of the kernels are burned through. Reduced charge shall usually become extinguished, leaving the bullet lodged in the bore, but sometimes the powder shall smoulder and generate detonating mixture of gasses.

When this coctail of gasses shall explode by heat and/or pressure inside the rifle chamber and bore, the shooter has a true bomb in his/her hands. It may be hard to believe the disaster what a considerably sub-minimum charge 0.20 gram of shotshell powder is able to generate behind 8 grams bullet in the .308 Winchester rifle: Shooter lost almost his life or at least his left arm. A charge 1.10 gram of the same kind of powder and same kind of bullet was completely safe in use: Five or six consecutive shots gave exactly same muzzle velocity. Accuracy is of "Bench Rest" class. Minimum charge of this very powder VV N320 is 0.40 gram in .308 Win behind the bullet LAPUA S374, but two foolhardy Finnish lads didn't believe it without a painful experience. Another almost lost his eyesight. He loaded 0.20 gram of N320 behind a jacketed D-46 bullet with weight 11 grams, while minimum charge of powder N320 is ca. 0.50 gram!

Behind the cast and lubricated lead alloy bullet, weighing ca. 6 grams (LEE 311-93-1R sized to diameter .309") the 0.20 gram charge of N320 was completely safe, subsonic and able to generate a very good accuracy. That's why I recommend use of cast bullets for the subsonic loads, if they are available, but the lubricated jacketed bullets are a fair substitute of them.


Food for thought above.

Skrev min kompis.

Din,

Dejan
Dejan P
 
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Inläggav Dejan P » 04 aug 2002, 15:57

Hej!
Nu har jag provat de första laddningarna enligt ovan. 2 gr N-310 gav verkligen "pisksnärtsljud". Både med gjuten och mantlad kula. Nu ska jag ladda ner.
Vänligen,
Dejan P
Dejan P
 
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Inläggav klas » 05 aug 2002, 16:26

jag har provat sakos 185grains subsonik amo i min ruger 308win med T8 ljuddämpare och den blev alldeles tyst . det ända som lät var ett litet förstärkning av ett tor klick . och den spred ca 25mm på 100 meter.Vet någon var man kan köpa 185-200 grins fmjbt kulor någon stans ? lappuas 200grains kulor vägrar winscan att ta hem om man inte beställer en hel låda .men om det finns någon mer som tar hem kulor från lappua så vore jag glad att få veta det!

kl
klas
 
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Inläggav Dejan P » 09 aug 2002, 19:53

Hej!
1.9 gr N-310 ger fortfarande "pisksnärtsljud".
Vänligen,
Dejan P
Dejan P
 
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Inläggav Dejan P » 16 aug 2002, 20:26

Hej!
1.8 gr ger nätt och jämt överljudsfart.
Vänligen,
Dejan P
Dejan P
 
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Inläggav Dejan P » 17 aug 2002, 16:22

Hej!
1.7 gr funkar. Håller man upp mynningen före skottet blir det inte mycket väsen. Rekomenderas för tyst skytte. Men inte ljudlöst. Antar man att hastigheten är nere på 325 m/s och kulan väger 45 gr klaras klass 4 gränsen.
Nästa omgång ska kronograferas och kollas på tavla. Håller träffbilderna minskar behovet för .22 lr-bössa.
Detta var skojj!
Vänligen,
Dejan P
Dejan P
 
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Tidernas BUMP!

Inläggav Saltvatten » 23 okt 2017, 12:43

Gör tidernas bumb och lyfter denna tråden eftersom detta är en så viktig tråd!

Efterfrågar erfarenhet av Hornet subsonics med N300 krut. Själv sitter jag på en N330 burk som, enligt infon i denna tråden, borde passa bra till subsoniska laddningar i 22 hornet.

Någon?
Användarvisningsbild
Saltvatten
 
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