The 22 creedmoor thread

[waspocrew]

Missed a coyote last night at relatively short distance (229 yards), so suspected my zero might not have been as good as I thought. Took it out today to confirm and I was shooting low and right. Now she's good to go.

I did shoot several jack rabbits with the 77 TMK though and this was about how most of them went. Not much left to take a picture of:

 

[ChrisAU]

Dude...nice deer.

What is your MV?

What do the organs look like?

3200. ~50 yard shot. I did clip one shoulder but had almost zero impact on the offside one. Everything between the two shoulders was a gelatinous mass of blood and tissue. Not really able to discern heart from lung.

 

[gtriple]

Can someone give me a sanity check on pressure signs? They go up from 38.5gr in 0.5gr increments from left to right and top to bottom. H4350 with the 88gr ELDM. Peterson brass. CCI450.

I input my parameters into Gordon’s reloading tool and it says I am reaching 62k at only 39.5gr. I was hoping to squeeze another 100fps out of it.

 

[willfrye027]

Can someone give me a sanity check on pressure signs? They go up from 38.5gr in 0.5gr increments from left to right and top to bottom. H4350 with the 88gr ELDM. Peterson brass. CCI450.

I input my parameters into Gordon’s reloading tool and it says I am reaching 62k at only 39.5gr. I was hoping to squeeze another 100fps out of it.

View attachment 1010266
View attachment 1010267

Looks to me like some pretty intense ejector marks on the last few. Virgin brass has a way of hiding pressure signs that on the next load cause sticky/stuck bolts IME.

Every time I’ve tried to redline a 22cm I’ve had to go back and reduce charge weights. The 88s seem to be especially finicky when loading near max.

If I was you I’d not push above book max especially on virgin brass…just a recipe for headache when you have to go back and pull a bunch of rounds as your barrel speeds up etc. stick with Peterson max charge weights or a little below unless you like to re-work a load up.

 

[gtriple]

Looks to me like some pretty intense ejector marks on the last few. Virgin brass has a way of hiding pressure signs that on the next load cause sticky/stuck bolts IME.

Every time I’ve tried to redline a 22cm I’ve had to go back and reduce charge weights. The 88s seem to be especially finicky when loading near max.

If I was you I’d not push above book max especially on virgin brass…just a recipe for headache when you have to go back and pull a bunch of rounds as your barrel speeds up etc. stick with Peterson max charge weights or a little below unless you like to re-work a load up.

These were all once fired at 38gr, then loaded this ladder. The last 2 (42-42.5) definitely had intense ejector marks. But then it randomly had ejector marks at 39.5gr too (but not 40 - 41.5).

The bolt lift was totally normal until 42gr.

Are these "shiny marks" normal? They show up on pretty much every case.

 

[4090Sharps]

These were all once fired at 38gr, then loaded this ladder. The last 2 (42-42.5) definitely had intense ejector marks. But then it randomly had ejector marks at 39.5gr too (but not 40 - 41.5).

The bolt lift was totally normal until 42gr.

Are these "shiny marks" normal? They show up on pretty much every case.
View attachment 1010423

The beginning of your pressure signs. Where the bolt rubs the ejector mark when turning to extract.

 

[willfrye027]

These were all once fired at 38gr, then loaded this ladder. The last 2 (42-42.5) definitely had intense ejector marks. But then it randomly had ejector marks at 39.5gr too (but not 40 - 41.5).

The bolt lift was totally normal until 42gr.

Are these "shiny marks" normal? They show up on pretty much every case.
View attachment 1010423

Hard to say..I feel like the brass lies to me half the time so I’ve just been going with book loads and book velocity. How many rounds down the tube?

 

[mtnbound]

These were all once fired at 38gr, then loaded this ladder. The last 2 (42-42.5) definitely had intense ejector marks. But then it randomly had ejector marks at 39.5gr too (but not 40 - 41.5).

The bolt lift was totally normal until 42gr.

Are these "shiny marks" normal? They show up on pretty much every case.
View attachment 1010423

I see those faint marks as the first subtle indicator of higher PSI but I’m not concerned unless I also get another PSI sign like bolt lift.
What was your velocity with the 38-38.5gr?

 

[gtriple]

Hard to say..I feel like the brass lies to me half the time so I’ve just been going with book loads and book velocity. How many rounds down the tube?

About 60 before this ladder.

 

[gtriple]

I see those faint marks as the first subtle indicator of higher PSI but I’m not concerned unless I also get another PSI sign like bolt lift.
What was your velocity with the 38-38.5gr?

Here's my actual fps and then what GRT calculates with a Sebert factor of 0.5. This is with a 16.5" barrel (PVA 100FB) and a Scythe Ti suppressor.

 

[HuntHarder]

Those all look Over pressure to me for my liking. Was there heavy bolt lift?

 

[gtriple]

Those all look Over pressure to me for my liking. Was there heavy bolt lift?

Not until 42gr. Everything before that felt just like the 38gr one.

 

[willfrye027]

Not until 42gr. Everything before that felt just like the 38gr one.

I am backing down my 24” 22 creed to 3100fps with the 88s…

If you really need another 100fps might want to try another powder IMO

 

[43.6N]

Consider trying a known book low-mid pressure load, possibly with a different powder. Something like 42gr H1000 with the 88’s. Then seeing if that ejector swipe is still present.

 

[Tullis94]

Here's my actual fps and then what GRT calculates with a Sebert factor of 0.5. This is with a 16.5" barrel (PVA 100FB) and a Scythe Ti suppressor.

View attachment 1010443

I shoot 40 grains of H4350, but with 80 ELDMs in Alpha srp brass. I get the occasional very light ejector mark even with that much powder and the lighter bullet. I would say im right at or even over pressure with that load in my gun. It also shoots 3290fps in a 20" barrel though. I'm not surprised you are getting heavy brass flow above that with the 88.

 

[Lawnboi]

Not until 42gr. Everything before that felt just like the 38gr one.

I’m guessing h4831sc is going to be your friend.

 

[waspocrew]

Here's my actual fps and then what GRT calculates with a Sebert factor of 0.5. This is with a 16.5" barrel (PVA 100FB) and a Scythe Ti suppressor.

View attachment 1010443

I'd go with a slower powder. You're not too far from what I'm getting out of a 20" Proof with the 88s and RL-23.

 

[waspocrew]

Got my zero figured out yesterday with my thermal. Was aiming bottom left corner. Made the adjustment and put the three into the bottom square. Went 3 for 3 at 300 on a gopher sized flapper target.



Plenty of jack rabbits (even out to 345 yards) last night with the 77 TMKs. Again, they don't leave much behind. I spotted a coyote crossing one of our pastures late last night. He was cruising around and finally stopped at 644 yards. Figured I'd send a hail mary and got lucky with a hit. Took me a while to find him in the sage and snow storm haha.

 

[Nine Banger]

Consider trying a known book low-mid pressure load, possibly with a different powder. Something like 42gr H1000 with the 88’s. Then seeing if that ejector swipe is still present.

I was getting 2725fps this summer with 42gr of H1000.

I got 3050fps with 39.5gr H4350 around the same time.

I saw pressure everywhere over 40gr with H4350.

18" barrel.

I'm looking forward to the 88 TMK coming out.