Is this to fast

[LV 426]

Tac powder 24.8
Lapua Brass
69 SMK
JP CTR 02 20"
2890
2898
2900
2890
2989
Brass. Primers looks good.
1/2" EZ or better.
I think JP said look for 2800 M.V. with 69 SMK ?

 

[tipper]

is it accurate for what you want to do.

 

[LV 426]

1/2 " @ 100 need to take it to 400 and see ?

 

[LRRPF52]

Tac powder 24.8
Lapua Brass
69 SMK
JP CTR 02 20"
2890
2898
2900
2890
2989
Brass. Primers looks good.
1/2" EZ or better.
I think JP said look for 2800 M.V. with 69 SMK ?

See that erratic, and 100fps higher spike? That's a bad sign. I just checked Sierra's data, and they list 24.2gr of TAC as a max load with the 69gr SMK.

Hornady's 8th Edition doesn't list any velocities with the 68gr BTHP going faster than 2800fps from their 20" Service Rifle AR15. They have two data sections, one for a bolt gun in .223 Rem, and one for 20" AR15 Service Rifle.

Primers are a terrible and unreliable indicator of pressure, since different primers will show cratering at totally different pressures.

 

[tipper]

The 100fps higher spike could be a mistype, I come up with 2950fps max psi of 61517, that's pretty hot.

 

[lte82]

If the primers arent falling out yet then you should be safe. The only negative of running a safe high pressure load is killing your brass prematurely.

 

[17874]

If the primers arent falling out yet then you should be safe. The only negative of running a safe high pressure load is killing your brass prematurely.

It's not exactly easy on the gun. A steady diet of hot loads will wear parts faster.

 

[tipper]

I have burnt many a barrel out, but loved the accuracy while it lasted.

 

[terrible tim]

Check the case head. 1/1000" expansion at the head and you're toast in a load, too hot. If the brass is flowing, don't bother going! Not sure on all of this semi-auto stuff, but on a bolt gun, that's too much pressure if the brass is expanding.

 

[LV 426]

Mistype...2889
2890
2898
2900
2890
2889
Just dont want to beat up the rifle.
just so damn accurate!! Thx all.

 

[LV 426]

Ramshot load data 5.56×45mm nato
69 SMK
TAC
START 22.4 @ 2775
Max 25.4 @ 3049
61,607 psi
24 inch

 

[LV 426]

Start 22.9