Berger 80.5

[kochie]

Question probably been asked a 100 times but I’m going to start loading for my new 22 CM here’s the question will my 1/8 twist barrel stabilize the 80.5 Berger full bore Bullets 28 inch barrel have you heard of anyone doing it ?

 

[SSchnd]

Yes - Start jumping 5thou, 10, 20, 30 see what it likes. I like to jump my B80.5 -.010 off lands in a Bolt Rifle and Service Rifle. the 28" 1/8 should do fine.

 

[kochie]

Yes - Start jumping 5thou, 10, 20, 30 see what it likes. I like to jump my B80.5 -.010 off lands in a Bolt Rifle and Service Rifle. the 28" 1/8 should do fine.

Ok thanks I didn’t want to go buy some if they wouldn’t work thanks again I have some 75 EDLM to try also .

 

[SSchnd]

Depending on the Chamber you have the 75 and 80 ELDM may worth trying in the rifle too.
We are currently using 88ELDM in a Factory FTR rig but we opened the throat up since we want to try the little 223 at FTR long range.
This factory chamber was a saami and we had to set the B80.5 back a bit to fit the chamber compared to the Wylde in our service rifles. It shot lights out but it is a 7 twist. Lot of us in Service Rifle use the B80.5 in the 20" XTC game for 600 yds line. Some run 7, some 7.5, some 7.7 and some 8 twists. I have never had an issue in a 8 twist using an 80 gr in a 20" tube.
What Powder will you using?

 

[kochie]

Depending on the Chamber you have the 75 and 80 ELDM may worth trying in the rifle too.
We are currently using 88ELDM in a Factory FTR rig but we opened the throat up since we want to try the little 223 at FTR long range.
This factory chamber was a saami and we had to set the B80.5 back a bit to fit the chamber compared to the Wylde in our service rifles. It shot lights out but it is a 7 twist. Lot of us in Service Rifle use the B80.5 in the 20" XTC game for 600 yds line. Some run 7, some 7.5, some 7.7 and some 8 twists. I have never had an issue in a 8 twist using an 80 gr in a 20" tube.
What Powder will you using?

Well I have H4350 RL 26 RL 26 & N550 I have lots of different types of powder thinking H4350 ?

 

[kochie]

Well I have H4350 RL 26 RL 26 & N550 I have lots of different types of powder thinking H4350 ?

RL 16

 

[kochie]

RL 16

I appreciate your help my new rifle is defiance action kreiger barrel manner stock trigger tech diamond

 

[kochie]

I appreciate your help my new rifle is defiance action kreiger barrel manner stock trigger tech diamond

Think gunsmith set it up with the 75 grain edlm lapua brass 6 mm necked down reamer.256 my brass .250 about 3 thousand per side still think I will beable to shoot the 80s though

 

[urbanrifleman]

RL 16

H4350 and r16. Should find the node between 40 and 41.5.

 

[kochie]

H4350 and r16. Should find the node between 40 and 41.5.

Thanks again all good info do you know approximately the FPS

 

[urbanrifleman]

Thanks again all good info do you know approximately the FPS

3200 to 3400

 

[kochie]

3200 to 3400

Thanks again

 

[RegionRat]

Here is how you can study the twist stability question yourself. It really is very simple to get an SG estimate and it doesn't cost anything to use.

https://bergerbullets.com/twist-rate-calculator/

Here are the input windows.

and here is the output


I used 2750 for muzzle velocity, then put in your 1:8, then moved your average elevation in Illinois to 600 ft.
Going up in speed adds a little margin, for example you get 1.46 at 2950, going up in altitude adds more.
The code estimates an SG = 1.43 at 2750 which is very close to their recommended 1:5, so you won't have a problem.
On the other hand, the most common twist for this kind of thing is a 1:7 in order to meet the BC expectations, but some folks run these at 1:8 with no problem unless they go to sea level. YMMV

 

[nakneker]

Been using that bullet in a Tikka 1/8 twist and a custom 22x47 also with a 1/8 twist. Great results, great bullet.

 

[kochie]

Been using that bullet in a Tikka 1/8 twist and a custom 22x47 also with a 1/8 twist. Great results, great bullet.

Thanks guys all good information

 

[kochie]

Been using that bullet in a Tikka 1/8 twist and a custom 22x47 also with a 1/8 twist. Great results, great bullet.

Thanks guys all good information

Thanks guys all good information

I might have to try it in my tikka 223 super varmint it has a 1/8 twist right now I’m shooting the 53 v max with good results but may try a heavier bullet

 

[RegionRat]

I might have to try it in my tikka 223 super varmint it has a 1/8 twist right now I’m shooting the 53 v max with good results but may try a heavier bullet

Life can be short, try them all...
Don't forget to try the 69 - 77 class bullets too.
The 77 TMK comes closer to the BC of the 80 grain class than it does to the older 77 OTM. The Hornady match and hunting bullets are worth a look too, and much easier to find, plus many of them can be run at standard magazine length. YMMV

 

[kochie]

Life can be short, try them all...
Don't forget to try the 69 - 77 class bullets too.
The 77 TMK comes closer to the BC of the 80 grain class than it does to the older 77 OTM. The Hornady match and hunting bullets are worth a look too, and much easier to find, plus many of them can be run at standard magazine length. YMMV

Ya I’m going to try few I have 69 smk 77 TMK & non tipped and others plenty to try

 

[Chilly807]

I've had so-so results using that bullet in a 223 with 8 twist barrel. Specifically a Tikka Varmint, 24" barrel.
Groups just haven't been as tight as I'd expect. The "marginal stability" as shown in the Berger calculator is what I've come to think might be the problem. Of course, YMMV.

 

[liseo]

The 80.5 grain bullet is what I use right now in my custom 223 F-TR rifle for fclass 300 m with great results, with stout load of N 150 powder