Bullet selection for 7.62x39 - multiple questions

TheCanAm

TheCanAm

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Does anyone with insight into ballistics or history of comm-bloc weapons know why we have so few choices for weights of 7.62x39 bullets? It is typically 122-124 or 154. Has anyone tried less than 100 grains to improve trajectory? Could that be shot with the twist found in a CZ858 or SKS?

My guess is the diameter wouldn't allow for a shorter bullet, but perhaps a hollowed bullet?
Maybe someone has already experimented with this and didn't live to tell.

Just curious about the why's and how's. Possibly interested in experimenting... :stirthepot2:
 
the case is pretty much optimal for the 120-130gr. any larger intrudes on powder space, any smaller the lower BC makes speed increase a moot point.
 
My son's SKS sure shoots the Sierra 150gr .311bullet on top of 21 gr of IMR 4198.Had 4 shots touching at 75 yards open sights old eyes of the bags.Should be about 2000fps
 
RBCD makes a "blended-metal bullet" (non-lead core) but according to US laws they are not commercially available.

RBCD Ammunition Ballistics:
7.62x39 TFSP 112gr ME 2391 MV 3100
7.62x39 TFSP 37 ME 1216 MV 3700

The BC would be similar to heavier bullets because it is just a lightweight core.
Anyone know of any equivalent?
Or, by chance, does anyone have any knowledge of making non-lead bullets, i.e. swaging?
 
If you had a Ruger Hawkeye in 7.62X39, you would have a.308" bore. That would open up HUGE options for you!

My Hawkeye shoots the .308",150 Grain Sierra very very well! I use H335 powder, And federal 210 Match primers. I removed the old blocked magzine well, and replaced it with a full sized .308Winchester magazine well. Installed a spare .308 follower plate & spring I had and presto! I can now shoot my bullets seated close to the rifling (jacketed or Cast).
 
Diversity of bullet weights is a reflection of a diversity of users and consequently diversity of applications. This happens in the west because citizens are permitted to use guns for their own purposes.

In communist countries citizens were not permitted to use guns for their own purposes. The only users were armies, the only use was combat. The overwhelming concern was standardization, so a single load was chosen and promulgated. Although the round has been available in the west for 20 years now, there has not been much drive to diversify the guns or how they are used, so the ammunition has not diversified, either.
 
Thanks for all of the insight, especially the historical context BattleRife. That makes a lot of sense.
I still don't hear anyone saying that it could not work to use a lighter bullet of the same length as the typical 124grain (i.e. hollow core).
Does anyone have experience swaging bullets?
 
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