155gr SOST?

[Tspeis]

It's been rumored for some time now that a 155gr 7.62x51mm SOST round is being developed for 16" guns. Anyone have info worth sharing? Thanks.


Tspeis

[DocGKR]

That is correct, as most folks are running the 16" 7.62x51mm rifles and the 155 gr is a better match than the 130 gr for the uses and distances currently being encountered OCONUS.

[Hootiewho]

Is the bullet construction basicalky the same as the 130? I know the 130 lacks performance at distance, but seems to be a fine bullet up close. I've only had a chance to take 1 hog with it, but I was impressed. What distance is the 130 grain loading good to out of the 13" barrel, vs the 155?

[Altair]

Is the bullet construction basicalky the same as the 130? I know the 130 lacks performance at distance, but seems to be a fine bullet up close. I've only had a chance to take 1 hog with it, but I was impressed. What distance is the 130 grain loading good to out of the 13" barrel, vs the 155?

I would also like to know the answers to these questions, especially the velocity thresholds for these bullets.

[QuietShootr]

That is correct, as most folks are running the 16" 7.62x51mm rifles and the 155 gr is a better match than the 130 gr for the uses and distances currently being encountered OCONUS.

Doc, I assume you're talking about the SCAR primarily?

[DocGKR]

FN SCAR Mk17 is one platform, but there are other 7.62x51mm 16" barrel systems in service, like the SR25 EMC and LaRue OBR.

[TMW]

Considering loading some 130gr SOST rds in a 9" bbl... that said would the 155gr bullets be more benefical? Wondering the terminal ballistics of each round (both 130gr & 155gr rounds) out of the various length bbls... Any info or recommendations DocGKR?
This would be for the 300 BLK of course.

[DocGKR]

The SOST rounds are for .308 velocities and will not be optimum at the lower MV of the .300BLK.

[TMW]

These SOST rounds would not be loaded subsonic rather at/for the higher velocity 300BLK ammo velocities, they would just be ran out of a 9in brl due to users weapon set-up, likely with a suppressor. I'm wondering what effect the 9in brl will actually have on the terminal ballistics, accuracy, velocity, and the likely & maximum lethal ranges etc. of the 9in & other SBRs.

If anyone loads or has loaded either the 130gr or newer developed/developing 155gr round please post your findings, reloading data or anything benificial for any realoader would be greatly appreciated.

I have a customer (and friend) who purchased the 130gr SOST rds and I'm looking at doing the same in order to reload these rounds and use with a suppressor also.

If figure these 130gr SOST rds would be better than most other bullets of the same grain weight(s). Any other recommendations, related info would be useful....

TIA,
Jeremy / TMW

[DocGKR]

TMW, the SOST 130 gr is designed for a MV of over 2900 fps; it does not work as well with an initial MV of 2100 fps when shot from a 9" 300 BLK...