Suppressors Would you shoot this

[M_R_Woodard]

Bought some Trail Boss and got an accurate subsonic load in my 6.5x47. The bottom group is at 50 yards and the top is at 100. You can see at 100 the bullet is yawing. This would be shot through a 30 caliber can. Load is 9.0 grains of TB, 120 amax and cci 450. 140 eldm's were completely side ways.

 

[Zak Smith]

I wouldn't.

Try a shorter (e.g. flat point) bullet, they will stabilize more for a given twist

 

[Mordamer]

Nope. I'd switch to Varget and load about 39 grains.

 

[M_R_Woodard]

I tried some 95 vmaxes but the velocity was inconsistent. Already have a good load with 130 hybrids and H4350, this is just for fun.

 

[Snuby642]

What was the velocity, twist rate?

 

[M_R_Woodard]

1025 fps, 1in 8 twist

 

[Snuby642]

What Zack said.
Might look at the br 300blk guys for ideas on bullet shape.

Rn flat base?
https://www.hornady.com/bullets/rifle/6-5mm-264-160-gr-interlock-rn#!/

 

[Zak Smith]

That might be too long, at 160gr!!!

Given the same mass and twist rate,
. a bullet that is shorter will stabilize better
. a bullet that has more mass at its circumference (vs. its axis) will stabilize better

 

[Snuby642]

Couldn't find rn or fn much for the 6.5.
Only checked 3 mfg's. Yes the 160gr would not probably work if at all load.
The bullet shape for a sub round was what I ment to suggest.

Was going to try the 150 and 220 rn from hornady in my 300 black.
Probably the 150gr first for the length like you suggested.
There was some evidence that the flat base may work well. (At subsonic)
The bc's they list didn't have any velocity rates so will see at 1050fps .
A bc comparison for sub's would be nice.

 

[Strykervet]

I remember talking to Bill A., this was regarding the 6.5G mind you, but he mentioned the 6.5's don't lend well to subsonic use. I bet large capacity cases would have more problems. Even the .308 subs are problematic and have several solutions for how to load one. Remember, low powder charges in a case is just as, if not more dangerous, than over charging a case. Both can cause dangerous pressure spikes.

The twist rate is also proportional to the velocity of the round used and it's geometry, I can't be positive right now about all that, but the twist rate formula is on Wikipedia. It'll tell you the ideal twist rate for the particular round. Some like the .300BLK are averaged out but I think you'll find the twist rate optimal for one 6.5 bullet moving at x velocity vs. one moving at a slower velocity will be off a good deal. I could be wrong, I haven't ran those specific numbers but it's not hard to do.

IMO/E, the 6.5's are all about performance. Supersonic performance. For subsonic, the .300BLK pretty much rules the roost. 220gr. subs from a .300BLK have great BC too and tend to go farther and drop less than one would imagine. There's also the .338 Blackout or Whisper as well as other hard hitting dedicated subsonic rounds.

Just my $.02.

 

[M_R_Woodard]

Thanks for the replies. I do have a 300 blackout already and a 22 suppressor so I'm covered for subsonic stuff. This is for fun and I enjoy reloading.

 

[Fig]

Whether it works well or not I think you're a boss just for trying this.

I keep quite a bit of cherrios on hand, because I have a lot of .45LC, and really enjoy shooting them. I had never thought about it, but it is an obvious choice for high volume in a big case (to me 6.5X47 is a huge case for pistol powder!). That it's as fast as shotgun powder is somewhat mitigated by it's volume. Still, I'm sure it's touchy, and the sweet spot is a couple of tenths. You're not filling up much case capacity even using TB.

Did you squib some bullets when you started?

 

[M_R_Woodard]

Hodgdon has a formula for using it in just about any catridge and actually encourages it on their site. Seat a bullet in the case, pull bullet and fill with powder to the base of were the bullet was. Then weigh powder and take 70% of that and that is your starting point.

 

[BigTex]

I had a subsonic .308 load using TrailBoss and a 220gr Hornady round nose. It was scary quiet.

I wouldn't shoot this load through a can, it is clearly unstable. If you want to continue down this path, find a shorter, flat base bullet to load.