SUB-SONIC Grendel loads

[txgunner00]

I've made a few attempts to develop a subsonic load for my Grendel (20" Satern) with out much success. I started using 140 grain Hornady spire points, trail boss, fire formed Winchester 7.62 cases and Federal LR magnum match primers. My first charge of 5.5g resulted in a stuck bullet. Second attempt with 8 grains of TB only gave me an average of 561 fps with and extreme spread of 145 fps. Even a full case compressed load of 9.5g only gave me 800 fps. Trail boss works great for .223 sub-sonics so I'm a bit disappointed it's not working in my Grendel.

My thought was to try universal clays next (mainly since I have it already) but I'm unsure on a starting load. My cases hold 18.4 grains of UC when filled to the top of shoulder/ bottom of neck line. I have an idea of where to start based on advice I've received on other forums but I was hoping someone here has actually tried it.



I have read and followed this already...

http://members.shaw.ca/cronhelm/DevelopSubsonic.html

Thanks in advance.

EDIT 4-30-12. Success! Lots of info over here. http://www.65grendel.com/forum/showt...sonic-Load-yet

[bwaites]

So far as I know, no one has come up with a subsonic load that fully cycles the action. Variable has played with it quite a bit because he shoots suppressed almost exclusively, and I'm sure he'll show up to post his results. I do believe that he was using a 160 grain bullet, though.

[b2948kevin]

I am also interested in this. Subscribed to thread

[Clod Stomper]

I'm pretty certain that there was an individual on the old site that stated that he had found a subsonic load that would cycle the action of his rifle. I don't remember his name or the load, but I do remember that he used a slower rifle powder than normal. Maybe he'll rejoin the forum and update us sometime.

Will

[txgunner00]

So far as I know, no one has come up with a subsonic load that fully cycles the action. Variable has played with it quite a bit because he shoots suppressed almost exclusively, and I'm sure he'll show up to post his results. I do believe that he was using a 160 grain bullet, though.

At this point I'm not really trying to get a load to cycle. Just trying to get one that will perform consistently.

I initially looked into 160 grain bullets but didn't find much that wasn't very expensive. Hornady used to make a 160 round nose in .264 but that's no longer in production. They do make it in .268 still (6.5 carcano) and I thought about getting a lee sizing die to be able to use them.

[zeeb_m4]

There was a guy who did get a load to cycle and stay subsonic ... I used to have the load in an email somewhere...I will take a look and see if I can find it. He was shooting a 6.5 Grendel from Tactical Rifles

[txgunner00]

There was a guy who did get a load to cycle and stay subsonic ... I used to have the load in an email somewhere...I will take a look and see if I can find it. He was shooting a 6.5 Grendel from Tactical Rifles

Any chance you remember the powder he used?

[warped]

It was Chris-Variable

If you don't find it I will ask him to re-post it

There will certainly be a few members needing that data soon

[Variable]

At this point I'm not really trying to get a load to cycle. Just trying to get one that will perform consistently.

I initially looked into 160 grain bullets but didn't find much that wasn't very expensive. Hornady used to make a 160 round nose in .264 but that's no longer in production. They do make it in .268 still (6.5 carcano) and I thought about getting a lee sizing die to be able to use them.

That's weird, my buddies wholesaler still stocks the Hornady 160gr. bullets.

HOB2640
Manufacturer HORNADY BULLETS [Website]
Man. Number 2640
Title HORNADY 6.5MM CAL 160GR RN
Description HORNADY 2640 BULLET RIFLE 6.5MM CAL .264"DIAM, 160GR, ROUND NOSE, 100 PER BX 5 BX PER CS

Update---Found this: "I just got this e-mail from Hornady:
Absolutely not. Somehow that bullet was inadvertently left out of our 2011 catalog, but we are NOT discontinuing it. Thank you."
here:http://forums.gunboards.com/showthre...CONTINUED!!!!!

I couldn't find my data on line. I'll look up my trail boss loads. The 160 Hornady should work great out of the 20" barrel. I haven't found anything to cycle my 10.5" while staying subsonic yet, but with 20" of barrel--- you should have a much easier time. I wanna say my TrailBoss load was around 9.6-9.7 grains, but DON'T quote me on that, as I don't have the data in front of me and I have a lousy memory.

I'll post back when I find it, and good luck with your loads.

[txgunner00]

That's weird, my buddies wholesaler still stocks the Hornady 160gr. bullets.

HOB2640
Manufacturer HORNADY BULLETS [Website]
Man. Number 2640
Title HORNADY 6.5MM CAL 160GR RN
Description HORNADY 2640 BULLET RIFLE 6.5MM CAL .264"DIAM, 160GR, ROUND NOSE, 100 PER BX 5 BX PER CS

Update---Found this: "I just got this e-mail from Hornady:
Absolutely not. Somehow that bullet was inadvertently left out of our 2011 catalog, but we are NOT discontinuing it. Thank you."
here:http://forums.gunboards.com/showthre...CONTINUED!!!!!

I couldn't find my data on line. I'll look up my trail boss loads. The 160 Hornady should work great out of the 20" barrel. I haven't found anything to cycle my 10.5" while staying subsonic yet, but with 20" of barrel--- you should have a much easier time. I wanna say my TrailBoss load was around 9.6-9.7 grains, but DON'T quote me on that, as I don't have the data in front of me and I have a lousy memory.

I'll post back when I find it, and good luck with your loads.

You telling me it's weird. I even called Hornady directly and was told it was discontinued. Good to hear it's still available.

Thanks for the info. Was your load cycling both suppressed and un-suppressed?