The 22 creedmoor thread

[Speaks]

So would the lswild prefits in 1:7.5 likely be better than the 1:8s?

 

[ACHILLES]

So would the lswild prefits in 1:7.5 likely be better than the 1:8s?

Decide what bullet weight range and barrel length you want to run so you have an idea on velocity and look at what elevations you will be shooting at. Then you can look at your stability rate and rpm’s to see what’s going to work best.

16” 7.5” twist running 88eldms at 3050fps is 292k rpm’s and 1.67 stability rate at 1000’ DA
(Ideal)

26” 7.5” twist running 88eldms at 3350fps is 321k rpm’s and 1.73 stability rate at 1000’ DA
(Not ideal due to high rpm’s)

So if you wanted to run a 26” with 88s an 7.8 or 8 twist would be better and run 301k rpm’s with an SG of 1.52 in the 8 twist

But in a 16” 8 twist stability rate is only 1.47

I ordered a 7.6” twist to rebarrel my 22creed at 20” to run 77tmk,80eldm, and 85.5bergers at 3300-3400fps but I ended up using it for my 22arc instead since the creed is still shooting well.

 

[Speaks]

Decide what bullet weight range and barrel length you want to run so you have an idea on velocity and look at what elevations you will be shooting at. Then you can look at your stability rate and rpm’s to see what’s going to work best.

16” 7.5” twist running 88eldms at 3050fps is 292k rpm’s and 1.67 stability rate at 1000’ DA
(Ideal)

26” 7.5” twist running 88eldms at 3350fps is 321k rpm’s and 1.73 stability rate at 1000’ DA
(Not ideal due to high rpm’s)

So if you wanted to run a 26” with 88s an 7.8 or 8 twist would be better and run 301k rpm’s with an SG of 1.52 in the 8 twist

But in a 16” 8 twist stability rate is only 1.47

I ordered a 7.6” twist to rebarrel my 22creed at 20” to run 77tmk,80eldm, and 85.5bergers at 3300-3400fps but I ended up using it for my 22arc instead since the creed is still shooting well.

Interesting. Had no clue about barrel length and ideal twist rate relationship.

Got a 16.5 so 7:1.5 hopefully good on both 80s and 88s. Or if I can find some factory 77tmk loads.

 

[nm.otter]

It'd be nice if bullet manufacturers would publish recommended RPM ranges for each design.

 

[ACHILLES]

Interesting. Had no clue about barrel length and ideal twist rate relationship.

Got a 16.5 so 7:1.5 hopefully good on both 80s and 88s. Or if I can find some factory 77tmk loads.

You will be good to go then with a 7.5” for 80s & 88s in a 16”

Most cartridges have a more forgiving window for twist, rpm’s, and Stability rate. But high performance cartridges like the 20-250, 22creed, and 6UM you need to look at all these details so you don’t spend several thousand dollars on a build that blows bullets up or shoots less than ideal from bullets being not being stable enough in flight.

It'd be nice if bullet manufacturers would publish recommended RPM ranges for each design.

I doubt they would ever put that liability on themselves. The general rule of thumb is keep below 300k with the heaviest for caliber bullets but some bullets can handle 315k just fine. Just depends on jacket thickness, baring surface, length, and bullet construction. With all the different barrel manufactures and varying specs. There’s to many variables like 3,4,5,6 groove rifling and .218-.219 bores. Plus bullets being spun at really high rpm’s might be fine the first few hundred rounds then start blowing them up as the round count gets higher, the rifling finish gets rough, and the throat has heavy fire cracking.

 

[mtnbound]

So would the lswild prefits in 1:7.5 likely be better than the 1:8s?

I have one of LSWILDS barrels with 1-7.5, and it shoots everything, including the 88eldms. It has been the best barrel I have ever had.

 

[Dude270]

Since you mentioned you were going with a 16.5" barrel, I'd go wirh a 1 in 7.5.

I have a 20" 7.5 twist and it does very well with 75 grain elds up to 88 gr. elds

 

[43.6N]

I’ll load a few 88eldm into 223 brass next.
I have a 1/7.5 223wy barrel from LS wild that stacks the 80eldm. If there is any hope for my supply of 88’s it will be from this barrel.

As follow up from yesterdays conversation:

I loaded up 30 88eldm with 23.5gr Varget in once fired Starline 223 brass.
Shot out of 18” 223 wylde 1:7.5 twist PBB barrel from LS Wild.

20rd group at 100yds:


I then spent 10 rounds validating BC at 850yds.
Consistent hits at 850 using the 0.545 G1.
Weather and station pressure was collected with a kestrel. AB Quantum was the ballistic calculator used today.



Conditions were windy/snow and sleet outside of Boise today.

Velocity over 30 rounds averaged 2593fps.
Accuracy was good.
BC was as advertised.
I held between 0.7 and 1.2 mil for 8-12mph crosswind at 850yds.

Conclusions:
-The 223 wylde chamber from PBB and 1:7.5 twist seemed to agree with the 88 eldm.
-Unclear if it’s the throat geometry, or the lower pressure of the 223 that helped to stabilize the 88.
-The 20 round group was acceptable, but is about 1.25-1.5x larger than a comparable 20rd group this barrel has produced with both 80gr eldm and 77gr TMK.

Does anyone on this thread have one of the PBB 22cm barrels with the 1:7.5 twist? Any groups with that barrel and the 88eldm worth sharing?

 

[Castle Rock]

As follow up from yesterdays conversation:

I loaded up 30 88eldm with 23.5gr Varget in once fired Starline 223 brass.
Shot out of 18” 223 wylde 1:7.5 twist PBB barrel from LS Wild.

20rd group at 100yds:
View attachment 987658

I then spent 10 rounds validating BC at 850yds.
Consistent hits at 850 using the 0.545 G1.
Weather and station pressure was collected with a kestrel. AB Quantum was the ballistic calculator used today.

View attachment 987660

Conditions were windy/snow and sleet outside of Boise today.

Velocity over 30 rounds averaged 2593fps.
Accuracy was good.
BC was as advertised.
I held between 0.7 and 1.2 mil for 8-12mph crosswind at 850yds.

Conclusions:
-The 223 wylde chamber from PBB and 1:7.5 twist seemed to agree with the 88 eldm.
-Unclear if it’s the throat geometry, or the lower pressure of the 223 that helped to stabilize the 88.
-The 20 round group was acceptable, but is about 1.25-1.5x larger than a comparable 20rd group this barrel has produced with both 80gr eldm and 77gr TMK.

Does anyone on this thread have one of the PBB 22cm barrels with the 1:7.5 twist? Any groups with that barrel and the 88eldm worth sharing?

A denser powder will give you more space to work with, you can go a couple of grains more with Varget but you will run out of room.
Try the same load of H4895 if you have it for at least a hundred fps more and probably better accuracy

 

[43.6N]

A denser powder will give you more space to work with, you can go a couple of grains more with Varget but you will run out of room.
Try the same load of H4895 if you have it for at least a hundred fps more and probably better accuracy

It just so happens that I do have H4895.
I’ll load up a few more, and see about eeking out a little more accuracy out of the 88’s

 

[mtnbound]

As follow up from yesterdays conversation:

I loaded up 30 88eldm with 23.5gr Varget in once fired Starline 223 brass.
Shot out of 18” 223 wylde 1:7.5 twist PBB barrel from LS Wild.

20rd group at 100yds:
View attachment 987658

I then spent 10 rounds validating BC at 850yds.
Consistent hits at 850 using the 0.545 G1.
Weather and station pressure was collected with a kestrel. AB Quantum was the ballistic calculator used today.

View attachment 987660

Conditions were windy/snow and sleet outside of Boise today.

Velocity over 30 rounds averaged 2593fps.
Accuracy was good.
BC was as advertised.
I held between 0.7 and 1.2 mil for 8-12mph crosswind at 850yds.

Conclusions:
-The 223 wylde chamber from PBB and 1:7.5 twist seemed to agree with the 88 eldm.
-Unclear if it’s the throat geometry, or the lower pressure of the 223 that helped to stabilize the 88.
-The 20 round group was acceptable, but is about 1.25-1.5x larger than a comparable 20rd group this barrel has produced with both 80gr eldm and 77gr TMK.

Does anyone on this thread have one of the PBB 22cm barrels with the 1:7.5 twist? Any groups with that barrel and the 88eldm worth sharing?

Here is my first attempt with the 88s with Lswild PPB 22CM 1-7.5. No big groups, as I was playing to see if they would work.

M

Post in thread 'What did you do in the reloading room today?'

Oct 20, 2025

22CM H4350 and N555 loads with 88ELDMs.

• mtnbound

•