Range Report 90gn SMKs in a 223AI?

[NorCal Vu]

Is that too heavy?

Should I go with a 80gn SMK? 75gn AMAX?

Would be fun to lob pills out to 1K but if I can get a solid 800yards with decent performance that will also do.

I have a Bartlien 7.5 twist 5R 27" blank for this build.

Will be running AICS 223 mags so OAL is a concern.

Thanks,

Vu

 

[7mmRM]

Re: 90gn SMKs in a 223AI?

75AMAXs @ 3100 via 223AI have no problem making it to the 1K line.

 

[MTETM]

Re: 90gn SMKs in a 223AI?

Vu,
I think you would need to check with Berger or sierra to see if the 7.5 will stabilize the 90's. Years ago when they first showed up most folks were using 6.5 to stabilize them. With more barrel and the AI you might get away with it in a cut rifle 7.5...
I think Sierra recommends a 6.5.

You might want to try the 80's at 1000.

 

[NorCal Vu]

Re: 90gn SMKs in a 223AI?

7mmRM...any chance you got a reamer preference?

MTETM...you are probably right...80s might be the max then.

Vu

 

[mj2evans]

Re: 90gn SMKs in a 223AI?

If you load to mag lenght with these heavier bullets you will eat up powder space. 75g AMax and up are llllllong bullets.

 

[brdeano]

Re: 90gn SMKs in a 223AI?

Vu, any throat that gets a 75AMax to the lands from 2.4-2.5" will work. I've them in that range and it still allows you to run even the 50Vmax's in the lands and keep enough bullet in the case.

My FF loads with 75Amax's in Virgin hulls run about 2950'ish and they still make it to the 1K line with no issues.

 

[AUJohn]

Re: 90gn SMKs in a 223AI?

75's-80's are optimal.
90's are not. you really need to push them and it's just not worth it for the little possible gain.

 

[wolfman]

Re: 90gn SMKs in a 223AI?

I think you might be surprise by the 90's. Jerry Teirny is making the 90 Bergers work out of a 30" 1-7.7" twist .223. Probably a single load option, when the temp is above 50 degrees, but the ballistics are impressive.
How long will the AICS mags allow?

 

[spot69221]

Re: 90gn SMKs in a 223AI?

80 AMAX

I may have a slight exception to the rule but 2950fps in a Rock 21" barrel, standard .223

http://www.snipershide.com/forum/ubbthreads.php?ubb=showflat&Number=1275592

 

[NorCal Vu]

Re: 90gn SMKs in a 223AI?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: wolfman1</div><div class="ubbcode-body">I think you might be surprise by the 90's. Jerry Teirny is making the 90 Bergers work out of a 30" 1-7.7" twist .223. Probably a single load option, when the temp is above 50 degrees, but the ballistics are impressive.
How long will the AICS mags allow? </div></div>

Yup..spoke with Jerry this weekend at the range. Going to get with him about pushing the 90s. From what I understand he tied the F-Class national record or something this past weekend with his 223 pushing 90s @ 2850.

I caught him passing by and he indicated I can do it it with my 223AI and a 26" tube out of a 7.5 twist.

 

[AUJohn]

Re: 90gn SMKs in a 223AI?

Read what I actually said

Let's make it simple.

Can you read a 1/2 MOA wind change at 1k?
If not what will you gain?
What pressure are the 90's running at?

Ignoring pressure is stupid.

I know I had a good hard look at projectiles over 80 and with a 30c temp swing I would have to load hot/cold for every batch of powder and then keep track of POI changes. I would still be pushing pressures even on a cold day on loads which would make any difference. What for?

 

[palma]

Re: 90gn SMKs in a 223AI?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Vu</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: wolfman1</div><div class="ubbcode-body">I think you might be surprise by the 90's. Jerry Teirny is making the 90 Bergers work out of a 30" 1-7.7" twist .223. Probably a single load option, when the temp is above 50 degrees, but the ballistics are impressive.
How long will the AICS mags allow? </div></div>

Yup..spoke with Jerry this weekend at the range. Going to get with him about pushing the 90s. From what I understand he tied the F-Class national record or something this past weekend with his 223 pushing 90s @ 2850.

I caught him passing by and he indicated I can do it it with my 223AI and a 26" tube out of a 7.5 twist. </div></div>

I've got a 31" Bartlein, and the 80s will beat the 90s all the way out there. 2850 seems a bit optimistic for the 90s as well. I load single feed at 2.55" to the lands for the 80s, so there is plenty of room for the 90s. I shoot the 80s at a mild 2950. SMKs suck by the way...go with the Bergers.

 

[OilyOwl]

Re: 90gn SMKs in a 223AI?

Brad nailed it.