| DarylS |
| (.700 member) |
| 30/12/16 06:25 AM |
|
Re: 9.3mm/ .366 bore
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Quote:
Daryl, if my 9.3x57 can duplicate 9.3x62 ballistics at <55000psi I will be quite satisfied. I also plan to develop modern loads for my 8x57IS and newly acquired 8x64S. The Mauser cartridges are in FN 98 Mausers with 3.3" mags and the 8x64S Brenneke is in a BRNO ZG47 with a 3.46" mag.So I can seat the heavier bullets flush with the base of the neck.
As most commercial chamber throats allow longer ctg. overall lengths than the magazines allow, being able to seat the bullets out not only improves accuracy, but also increases case capacity.
In rifles with chambers too long to reach the lands with the bullet, seating more deeply in the case, reducing case capacity also increases pressure. Being able to seat long, allows more powder due to the increased case capacity.
If the 9.3x57 is chambered in a M98 action, 55,000psi is not your upper limit. Even the m46's in M96's or M94's in any of the 57mm rounds, or the 9.3x62 have CIP limits of 57,000PSI. The 6.5x55 is listed as 55,000psi.
If you could barrel up a .30/06, or .308Win., your 'upper' limit just grew to 60,000psi or 62,000PSI - .270Win or 6mm Rem raises it even further, just with factory ammo.
http://kwk.us/pressures.html