223 & 75 AMAX

[jesilva]

What do you think the minimum velocity should be with a 9 twist 223 for the 75 AMAX in order to get them to stabilize at 300 + yards.

Jim

 

[SNAFUBAR]

I could not get the 75g bullets to stabilize in my 1:9 twist, regardless of load, had to drop back to 68/69g to get the accuracy. My Target load for the 69s is 23.8g of 2520 with CCI450 primers.....shoots a little under 1MOA at 300yds in my 24' bbl.
My 1:7.75 twist rifle absolutely loves the 75g AMAXs...shoots sub 1/2 MOA at 300yds and 1/2 MOA at 600yds

 

[ronemus]

The 75 gr A-Max is at best marginally stable shot from a 1:9 twist barrel; I get the best results from a 1:7. You'll probably do best with the Hornady 75 gr BTHP, which has a higher BC than the 68/69 gr bullets and is stable from a 1:9 twist.

 

[chestsprings]

in my Savage, 223 McGowan barrel, 1:9 twist, I get great groups using the 75 gr. A-Maxes.

I have not shot 300 yds. only 100 & 200 yds.

using H-4895, & Varget at right around 2950-2975 vel., they shoot better than I can.

I had mentioned on another post, before I bought the McGowan, & Shilen 22-250 barrels for my Savage, I called Hornady tech's. they told me the 1:9 will stabilize the 75 A-Maxes, but if you want to shoot the 80 gr. A-Max's, you need a 1:8 twist.

maybe you can check to see if the barrel is really a 1:9 twist.

I'm very pleased with the 75 gr. A-Max's in both my 223, & 22-250.

 

[jesilva]

I agree. I got good groups at 100, but 300 yards were like patterns. I was using 748. The load I tried using IMR 4895 seems to want to group at 300. I haven't chrono'ed this load and that is why I asked the velocity question. It seems the 75 AMAX is right on the edge for stability in the Savage 1:9 twist barrel.

 

[1000yardstare]

Could not get the 75 AMax to stabilize in a Ruger 9 twist Mini 14 Target thumbhole rifle. Great with 69s. Sold the rifle.

 

[olympian]

What do you think the minimum velocity should be with a 9 twist 223 for the 75 AMAX in order to get them to stabilize at 300 + yards.

Faster than is safe to attempt to acheive.

 

[JCinCalif]

Hi Jimmy!

My 1:9 CZ won't stabilize the 75 VMAX. Your most likely going to need a faster twist.

John

 

[gunnut606]

I think 1 in 9 is right at the border, some will and some won't. Had a worn out Shilen 22-250 w/ 9T rechambered to 223 and it shoots 75 Amax very well at 300 yards w/ normal load using R15.

 

[Johnboy]

hello,i just got my 1:9 to shoot the 75g berger vld with imr 4007.can not remember the weight at this time but it shot at .308 at 100yrds for the first time loaded in a new rifel.but like one said i think some will and some want.i think it's just how good or true of a 1:9 twist one gets in their rifel.also my first load was jamed in the lands.already loaded 5 more with .010 jump.and i'll see what they will do and get back with ya.
Johnboy


shoot,shoot again,'reload'