On keegi sellise kuuliga laadinud ja millised on tähelepanekud olnud? Ise laadisin N120 rohuga 1,2g ja rahule ei jäänud. Algul mõtlesin, et püssi viga siis proovides Sako tehaselaetud FMJ millega sain oluliselt parema tulemi. Püssideks siis algul Sako Varmint ja IZ-18MH.
Pilt märklehest ka. Ring kujunes lõpuks ühtepidi 5,5cm ja teistpidi 5cm.
http://www.album.ee/?o=291402520 Ps. ise ennast heaks laskjaks ei pea, aga Sako moon andis kinnitust, et hõisata see laetud Speer ka pole (muidugi kuul on kaalu poolest paras jurakas ka).
Nii rasket kuuli sinu 222REM raud hästi kontrollida ei suuda, sest vindisamm (twist) on sinu relval ilmselt 14" või mis tähendab, et parima tulemuse saad 50-55 GR(3,2-3,6g) kuulidega. Raske, 62GR kuuliga lasevad USA laskurid oma 223Rem püssidega mille vindisamm on 12" või isegi vähem!
Vihtavuori kasutab jah tavaliselt ühte test rauda aga seda ma mäletasin hästi, et kuni 55GR ehk 3,6 g suudab tavaline 14" twistiga raud kontrollida.
Kuna siin küsiti siis lisan Shileni rauatehase arvamuse:
By way of explanation, the numbers in the "Twist" column indicate how far the bullet must travel through the bore to make one full revolution. This is determined by the rate of rotation of the rifling. For example, a 9"-twist barrel spins the bullet one full turn when it passes 9 inches through the bore. In a 16"-twist barrel, the bullet makes one revolution in 16 inches. So at the same bullet velocity, the 9" twist is faster (spins the bullet faster) than the 16" twist. Consequently, as the chart reflects in the .224 CF section, the 9" twist is necessary for stabilizing heavier bullet weights.
Again looking at the .224 CF section, if you're planning to shoot 55-grain bullets, the 14" twist is ideal. This twist is also the best choice for 52- and 53-grain match bullets driven at moderate velocities. But if you're also contemplating shooting a 60-grainer, go with the 12" twist, since it will stabilize all the bullets you'll be using. As you can see from the 15" and 16" twists, higher velocities also spin the bullet faster and may enable a slower-than-recommended twist to stabilize a marginally overweight bullet. However, this is tricky stuff best left to those who are highly experienced in operating at the ragged edge of stability and sanity.
The basic principles just outlined apply to all the calibers below.
But, if you have questions or need a recommendation, let us know.
.224 (222REM, 223REM, 22-250REM)
- 8" for bullets heavier than 70gr.
- 9" for bullets up to 70gr.
- 12: for bullets up to 63gr.
- 14" for bullets up to 55gr.
- 15"* for bullets up to 55gr. driven 4,100 fps or more
- 16:* for bullets up to 55gr. driven 4,300 fps or more
.308 meestele ka:
- 8" for bullets heavier than 220gr.
- 10" for bullets up to 220gr.
- 12" for bullets up to 170gr.
- 14"* for bullets up to 168gr.
- 15"* for bullets up to 150gr.
