The 22 creedmoor thread

[sndmn11]

My dad’s tikka in 22-250 that we had chambered to 22cm hated the 88’s. I’m talking 3”-5” groups. Shot the 80 eldm about 2”, and the 80 eldx slightly better. Tried h4350 and 6.5 Staball.

Loaded 5 with 77 tmk’s and 6.5 Staball just shy of 1/2”. Going to load 15-20 more and retest and then off to the races if it holds up.

The one I am shooting now is the same, except it won’t shoot the 80gr X or M. 77gr TMK’s are good.

Thirdsies.
I have some large groups with 80gr eldm out of my new barrel.

 

[Formidilosus]

Form, would you mind listing out the negatives of carbon compared to steel? Don’t think I’ve seen you post about it before but know Rokslide generally sides with you on that.

Lightest possible option is heavier, way higher chance of getting a bum barrel, overall tend to be more finicky with precision, they insulate and cook the chamber*, much more expensive.

 

[NoDakhunter]

I’m also curious. I had a tikka rechambered a year ago and I have no idea on the free bore specs. I shoot 75 ELDM at 2.63 COAL with no issues. I haven’t tried shooting anything else. Essentially a longer freebore/throat allows you to seat bullets out longer before reaching the lands? Am I understanding that correctly?

Anyone able to explain my freebore question?

 

[Grizzle]

Anyone able to explain my freebore question?

Yup your right

 

[Lawnboi]

Anyone able to explain my freebore question?

Guys will target a certain freebore to maximize case space (not an issue with most common powders for 22 creed) and to keep the bottom of the beating surface of the bullet out of the area at the bottom of the neck where doughnuts can form during repeated firing and sizing.

Plenty of chambers fire bullets with the bullet deeper in the case and do just fine, maybe not totally ideal, but 6.5 creedmoor is a good example, most factory loadings put that boat tail junction way down the case.

In extreme cases you may not be able to fire certain bullets due to length. Hence why people will adjust freebore to the length of bullet or specific bullet they want to shoot.

Fwiw if your rifle is shooting well and your happy shooting 75 eldm just keep on shooting and don’t worry.

 

[NoDakhunter]

Guys will target a certain freebore to maximize case space (not an issue with most common powders for 22 creed) and to keep the bottom of the beating surface of the bullet out of the area at the bottom of the neck where doughnuts can form during repeated firing and sizing.

Plenty of chambers fire bullets with the bullet deeper in the case and do just fine, maybe not totally ideal, but 6.5 creedmoor is a good example, most factory loadings put that boat tail junction way down the case.

In extreme cases you may not be able to fire certain bullets due to length. Hence why people will adjust freebore to the length of bullet or specific bullet they want to shoot.

Fwiw if your rifle is shooting well and your happy shooting 75 eldm just keep on shooting and don’t worry.

Thanks for the info. I just started reloading and my gun is shooting too good with that depth to move it. My max coal with Hornady gauge is 2.684. Not going to chase lands with a barrel burner like that anyway.

 

[ACHILLES]

200lb boar at 245yds
18” bbl 80Eldm @2950fps MV
Impact vel. 2478fps

He was facing away from me slightly to left. Put it on the 2cd to last rib and shot. He ran off in the brush. There was good blood on the ground right where he was shot and a good blood trail I followed 100yds in the brush were he was laying. Bullet entered in the back ribs and went up in the vitals. Didn’t exit but the entrance was bleeding heavily.

 

[Fire_9]

Finally got my new 22 creed to the range. It’s got an Ace light Palma cut at 17”. Loaded some H1000 and 4831sc with the 88 Elds. Loaded the h1000 to 44 grains and 4831sc to 43 grains. Shot the h1000 first and it topped out at about 2810 fps with good accuracy. 4831sc topped out at about 3000 fps also with good accuracy. Neither one showed pressure signs. I’ll just roll with the 4831sc as I was running out of capacity with the H1000. Here’s a pic of the 10 shot group with the 4831sc. 2 rounds at 5 different charge weights

 

[mwoolsey5]

If I haven't screwed up too badly in Gordon's Reloading Tool, here's what I'm seeing as the best potential powders to use for 77 Sierra TMK's, 80 ELD-M/ELD-X, and 88 ELD-M's out of a 16" barrel. No compressed loads, under 62K pressure, and 100% burn rate.

TL;DR: N150, N540, N550, RL15, RL16, IMR 4198, Varget, H335, CFE223,
*IMR 4350 got missed in picture, but is also viable.

H4350 and N555 would probably also be good options in a bit longer barrel (18-20").

 

[st1650]

Has anyone had any 77TMK blow up at 3175 FPS out of a 7twist ?

Trying to work up a 77 LRX load but so far it's been less than stellar accuracy.

 

[Jake Leibke]

Has anyone had any 77TMK blow up at 3175 FPS out of a 7twist ?

Trying to work up a 77 LRX load but so far it's been less than stellar accuracy.

Maybe doesn’t help you much but had good results with the 77 TMK at 3200 but with an 8 twist barrel.


Sent from my iPhone using Tapatalk

 

[st1650]

8tw is below 300K RPM
7TW is slightly above at 326K. It’s a bit of a danger zone with non minos. I know the Hornady eld-m tend to blow up near 300K but I’ve heard the Sierras are a bit better, especially the TGK. Not sure about the TMK

Out of curiosity, what’s your chamber freebore and how long do you load your 77TMK ?