Load Data for Hdy 155gr. A Max .308 [Archive] - Glock Talk

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gforester
11-02-2011, 21:28
I couldn't scare up load data for this projectile in my Speer book with the Hodgdon powder I have or for this particular A Max bullet. After searching I found nothing on the Hornady or Hodgdon website. So I came up with what may be a workable solution. Tell me if this is a safe way to work up a load.

I found load data for a Sierra 155 grain bullet but I wasn't sure about the COL of 3.225". I measured the projectile length on my 175 grain Barnes bullets and compared that to the Hornady's. There was .115" difference in bullet length. I used the COL for the 175gr bullet and reduced it by the .115" difference. My thoughts are that the same case volume would be had and I could avoid any over pressure issues. I am starting my workup with the lightest charge for the 155 grain Sierra bullets.

Sound workable?

PCJim
11-02-2011, 22:31
Sounds workable to me, as regards a starting COL. If you have a dremel tool and a 308 case you can afford to resign to COL testing...

Cut two slits 180 degrees apart (on opposite sides) down the case neck, almost to the shoulder. Seat one of your A-Max bullets very long in this modified case. It should seat tight enough to stay in place, yet be able to be pushed somewhat easily into the case when it makes contact with the leade / rifling. Carefully chamber the round, close the bolt and allow the leade to push the bullet into this modified case. Carefully, remove the round and measure the COL. Repeat several times to gain confidence in the COL figure. This will be the COL for this particular rifle that puts this particular bullet against the leade.

Most reloaders will back off the lead 0.02 inches to begin with and experiment with a bit closer or farther away to see where the best accuracy can be found. Be sure to perform this test for every bullet weight/profile/manufacture that you will use in this rifle.

gforester
11-02-2011, 22:49
Wow, that is some good info Jim, thanks. I never thought about doing something like that. Actually it is for my 30.06 rifles. I have a Springfield 03A3 and a Savage 110 I could do it to each and see if they need different lengths. I even have a few bad cases I could use for it.

fredj338
11-02-2011, 22:50
You aren't going to havean over pressure event using 175gr data for a 155gr bullet. The OAL will vary w/ every rifle though. You need to load a dummy round, as Jim describes, & check in your gun for fit. The A-max in any caliber/wt is quite long.

PCJim
11-03-2011, 07:25
GF, I expect an accuracy report on that Savage. Then again, it might add to my disappointment. :cool:

gforester
11-03-2011, 10:03
GF, I expect an accuracy report on that Savage. Then again, it might add to my disappointment. :cool:

As soon as I find out I will let you know. The range was closed yesterday due to them setting up for a USPSA event, so I will have to wait a bit more. This will give me some time to do some trial fitments before I load up some A Max bullets. :supergrin:

F106 Fan
11-03-2011, 10:26
GF, I expect an accuracy report on that Savage. Then again, it might add to my disappointment. :cool:

My grandson shoots a Savage Long Range Precision Varmint in .223. 1-1/2" groups at 300 yards using a 10 power Nikon BDC.

My Savage F-Class (6.5x284 NORMA) puts all the bullets in the same hole at 100 yards. My 40 power Leupold BR scope didn't work out too well when we were shooting at 300 yards - too much mirage to find the target.

I really like the Savage Accu-Trigger. Over time I plan to get one of their tactical .308 and .338 Lapua rifles.

Richard

PCJim
11-03-2011, 12:54
I need to make a modified 308 case for the SPS Tactical I just acquired. I'll post a picture of the case modification, hopefully this evening.

rg1
11-03-2011, 14:01
Hornady 8th Edition manual lists an oal with the 155 A-Max at 2.800" in 308 Win . They tested with a Win model 70 with Hornady cases and Fed 210 primers. H 4895 from 37.2 to 44 max and Varget from 35.9-44.9 max. For a M1A Service rifle they used Hornady cases and Win LR primers, same oal, with a max load at 42.9 grains of H 4895 and a maximum with Varget at 43.2. Only Hodgdon powders they tested in the 8th. I see you're shooting them in 30-06.

rg1
11-03-2011, 14:20
In 30-06 Hornady 8th gives an oal at 3.210" tested in a Win model 70 and an oal at 3.240" in their Garand section. Varget from 41-51.6 max. H 414 from 48.5-58.8 max and H 4350 from 49.4-60.5 maximum using Hornady cases and Fed 210 primers. The M1 Garand section lists H335 from 36.9-46.4 max and Varget from 42.3-46.2. H4895 was 43.2-46.4 max usin Horn. cases and Win LR primers.

gforester
11-03-2011, 14:24
Hornady 8th Edition manual lists an oal with the 155 A-Max at 2.800" in 308 Win. That should give you a starting point. They tested with a Win model 70 with Hornady cases and Fed 210 primers. H 4895 from 37.2 to 44 max and Varget from 35.9-44.9 max. For a M1A Service rifle they used Hornady cases and Win LR primers, same oal, with a max load at 42.9 grains of H 4895 and a maximum with Varget at 43.2. Only Hodgdon powders they tested in the 8th.

Does your Hornady book have load data for that bullet in a 30.06 rifle?

rg1
11-03-2011, 18:46
Data for 30-06 above. Saw the .308 in the title and didn't read all the posts.

Cavalry Doc
11-03-2011, 19:47
I couldn't scare up load data for this projectile in my Speer book with the Hodgdon powder I have or for this particular A Max bullet. After searching I found nothing on the Hornady or Hodgdon website. So I came up with what may be a workable solution. Tell me if this is a safe way to work up a load.

I found load data for a Sierra 155 grain bullet but I wasn't sure about the COL of 3.225". I measured the projectile length on my 175 grain Barnes bullets and compared that to the Hornady's. There was .115" difference in bullet length. I used the COL for the 175gr bullet and reduced it by the .115" difference. My thoughts are that the same case volume would be had and I could avoid any over pressure issues. I am starting my workup with the lightest charge for the 155 grain Sierra bullets.

Sound workable?

7th edition of the Hornady Manual gives the following load for A-Max 150 - 155 gr.

Maybe I missed it, but I didn't see which Hogdon powder you are using????

H 4895 powder

C.O.L. 2.800

Min 37.2 gr, redline max 44.0 gr.

Min Vel 2300, redline Max Vel 2700.

Consult the manual, and triple check all numbers.

:wavey:

PCJim
11-03-2011, 19:58
GF, I forgot to mention that you should use a neck sized only case that was previously fired in the rifle's chamber. You want to keep the fire formed chamber dimension. While you could use a case that had not been fired in the rifle, you may encounter headspace error in determining the COL to the leade.

gforester
11-03-2011, 22:16
Thanks for all the data and setup tips guys. I think I will use the check method PCJim described in each rifle to see what I come up with.

The powder I have is the H335, maybe not the best for high power 30.06 loads, but it meters well and that is the only rifle powder I have at the moment.

I came up with a 3.185" COL using my extrapolations and maybe I can go a bit longer to improve accuracy. I loaded 5 cartridges up to that length with 46.0 grains of powder. That was the lower end for the Sierra 150 grain bullets but with the new data provided by rg1 it appears I could drop the charge even more as that is near top according to the Hornady book.