SUB-SONIC Grendel loads
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...
Thanks in advance.
EDIT 4-30-12. Success! Lots of info over here. http://www.65grendel.com/forum/showt...sonic-Load-yet
Last edited by txgunner00; 05-07-2012 at 09:46 PM.
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.
I am also interested in this. Subscribed to thread
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.
At this point I'm not really trying to get a load to cycle. Just trying to get one that will perform consistently.
Originally Posted by bwaites
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.
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?
Originally Posted by zeeb_m4
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
That's weird, my buddies wholesaler still stocks the Hornady 160gr. bullets.
Originally Posted by txgunner00
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."
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.
Originally Posted by Variable
Thanks for the info. Was your load cycling both suppressed and un-suppressed?
Last edited by txgunner00; 04-22-2011 at 03:29 AM.