TAC + 123g SST

[ragedracer1977]

Read back to ragedracer's First post----his BBL. NUT came loose,,, While he shot it, = many of us have wondered--What's up with that?

Maybe ragedracer could explain it .

I'm not sure what the question is. The barrel nut came loose while I was shooting. What are you asking for clarification on?

[45r]

On my upper build the nut wouldn't center under 60 pounds.
My torque wrench clicked at 85 pounds when the barrel nut got real close on my Lo Pro upper.
I had to give it just a tad more torque and it centered.
It's probably close to 95 pounds.
Don't like to use locktite if I don't need it.
Might be a little too much but it probably won't come loose.
Your rifle looks good with the upgrades.
Probably shoot a lot better also.

[jurassic]

If anyone has access to TAC or knows where there's some hiding I would love to buy it. I have Barnes 100grn TTSX bullets loaded with TAC, they are deer slayers!

[cst]

85 isjust fine,,,you can buy the reciever lapping tool from Wheeler to bring it down if you really have to. I wouldn't unless your having accuracy problems. I built one years ago and played around with varies torque settings...I tried 30ft/lbs....I ripped it loose durimg a barricade exercise with a verticle grip.... never go low again...50lbs+ is a more safe area.

[cst]

Waiting on range update from ragedracer when available!

[ragedracer1977]

Waiting on range update from ragedracer when available!

Well.... I'm happy!!

Here's 27.5 grains of TAC. ~1/2 MOA? I'll take it! Ignore the 2 low shots, they're actually high shots from when I was sighting in the scope.




28.0 I think would have printed similarly, but the target frame started rocking in the wind. The flyer out left I pulled the trigger just as the stand leaned backward.




For comparison, here is the 27.5 and 28.0 targets from last time I was out.





Considerable change.

[45r]

Looks like a good shooter now.
Your upgrades worked well.

[LRRPF52]

Very nice groups. I'm ascertaining that the change was tightening your barrel nut?

I suspect ragedracer77 already knows this, but I wanted to mention that when determining your charge weight increments in the Grendel ( or any cartridge), take the case capacity or max load listed for that powder, then load in 1% increments of that. Example:

Case capacity is 34-35gr of water, load in .3gr increments. 34.0 x .01 = .34gr

If the maximum charge listed is 27.0gr, load in .2-.3gr increments.

In my .260 Remington, a lot of charge weights are over 40.0gr of powder. Many of the max loads are 45.0-49.0gr.

1% of a 49.0gr max is .49gr, or a usable .5gr increment on the scale.

In the .223 Remington, we step it down a bit. I don't load over .2gr increments when doing an accuracy/pressure ladder with the .223 Rem.

[ragedracer1977]

Very nice groups. I'm ascertaining that the change was tightening your barrel nut?

I suspect ragedracer77 already knows this, but I wanted to mention that when determining your charge weight increments in the Grendel ( or any cartridge), take the case capacity or max load listed for that powder, then load in 1% increments of that. Example:

Case capacity is 34-35gr of water, load in .3gr increments. 34.0 x .01 = .34gr

If the maximum charge listed is 27.0gr, load in .2-.3gr increments.

In my .260 Remington, a lot of charge weights are over 40.0gr of powder. Many of the max loads are 45.0-49.0gr.

1% of a 49.0gr max is .49gr, or a usable .5gr increment on the scale.

In the .223 Remington, we step it down a bit. I don't load over .2gr increments when doing an accuracy/pressure ladder with the .223 Rem.

Actually, I replaced the upper receiver and free float tube. =)

And, thanks for the charge weight calculation, I didn't know there was math to it. =) I just went with .2 - .3g as a matter of course. This one I only went with a couple loads because I wanted to see if my accuracy improved at all with the new parts. Now that I know it did, I'll do a proper ladder and come up with a load.

Thanks!

[A.D.D. AR]

raged racer-
nice work! Gotta love it when a plan comes together. Looks like you're pretty close to the "sweet spot"... you'll find out when you do the ladder test.. Nothing puts a smile on
your face like a "bug hole" group after a ladder test.
Nice rifle , by the way.
-mike