22 Creedmoor and 77gr. Sierra matchking

[titus123]

So I'm new to the 22 Creedmoor, and I'd like to use the 77 gr. SMK bullets ( I have a stockpile of them). That said, how do they hold up between 3200-3300 fps? I've read that if you over stabilize them, or run them too fast then might come apart at longer ranges

Specs: Savage 10 action, trued receiver, bolt face, NSS Barrel nut, PTG recoil lug, fitted with Savage Target Trigger.
Shilen 1-8 twist barrel standard throat, no turn neck

 

[Walt Krafft]

In my experience barrel heat is worse than speed. Shoot 15 to 20 shots in 10 minutes at that speed and every bullet will come apart.

 

[shrimpsauce]

I have a 20” 8 twist and run the 77tmks at 3365 with great results.

 

[gatewood]

I’ve run em in 2 different 1-7 barrels. Shoot great. 26” barrel was 3280 & 22” barrel 3180. Same load of N-555 40.5gr

 

[titus123]

I have a 20” 8 twist and run the 77tmks at 3365 with great results.

That's what I'm wanting to hear.

 

[titus123]

I’ve run em in 2 different 1-7 barrels. Shoot great. 26” barrel was 3280 & 22” barrel 3180. Same load of N-555 40.5gr

Good to hear. Thank you

 

[jelenko]

At 3280 in a 7 twist, they're spinning at 334K. Sierra recommends 250K to 260K.
As Walt mentioned, if the barrel heats up, the chances of bullets coming apart will increase.
Berger did a study on what caused bullets to come apart. There were several contributing factors but the immediate cause was some of the lead melting from heat going down the barrel. The higher the RPM's, the less the lead had to be melted.
At 3280, I would think a 1:9 would be ideal.

 

[SGT. Slaughter]

You guys killing any deer with the 22 creedmoor? If you are what bullet and what velocity and what barrel length?
Thanks!

 

[gatewood]

At 3280 in a 7 twist, they're spinning at 334K. Sierra recommends 250K to 260K.
As Walt mentioned, if the barrel heats up, the chances of bullets coming apart will increase.
Berger did a study on what caused bullets to come apart. There were several contributing factors but the immediate cause was some of the lead melting from heat going down the barrel. The higher the RPM's, the less the lead had to be melted.
At 3280, I would think a 1:9 would be ideal.

Not had one come apart yet. Had the 77tmk up to 3400 in a 1-7. Had the 3280fps load shooting great in 26” barrel heavy varmint rifle. Built a light 22creed with 22” carbon 1-7 “truck gun”. Grabbed ones loaded for heavy gun to sight light gun in and get some rounds down barrel, they just hammered. First couple groups at 100yd were in the .2s and first 5 shot group at 300 was .78. Zero load dev for that rifle.
Wanted a better bc in heavy gun. It’s running 80 Eldms at 3290 now. That barrel has 1200 rds on it with pretty good fire cracking for first 12” still haven’t had one come apart.
The TMK was a lot less seating depth sensitive than the VLD style bullets.

 

[jelenko]

Yeah. It's not guaranteed to come apart. Just increases the chances.
I didn't have any come apart - until they did.