need load help


PDA






jr81452
June 30, 2007, 06:16 PM
i need a load for the 208gr Amax in .308 win using RL15, RL19, or RL22. apparently Alliant does not think you should use anything over 180gr in .308win as they don't list any. and the Lee and lyman loadbooks don't show any using RL powders.
thanks

If you enjoyed reading about "need load help" here in TheHighRoad.org archive, you'll LOVE our community. Come join TheHighRoad.org today for the full version!
dmftoy1
June 30, 2007, 07:27 PM
208 A-max?? Do you mean 178 A-Max?

If so, then I show the following for RL-15 (Hornady's latest manual)

34.8 - 2000 fps
36.5 - 2100 fps
38.1 - 2200 fps
39.8 - 2300 fps
41.4 - 2400 fps (Max)

COL 2.800

dmftoy1
June 30, 2007, 07:29 PM
Just double checked Midwayusa and they show a 208 a-max . .interesting that Hornady's latest manual doesn't show it . . I wonder if Hornady's website would have the load data you're looking for?

Alphazulu6
June 30, 2007, 07:44 PM
WOW thats alot of weight for a .308 to carry.........

jr81452
June 30, 2007, 10:56 PM
208gr is what i am looking for. i have data for 178gr.

USSR
June 30, 2007, 11:10 PM
jr81452,

I have loaded 190gr SMK's in my .308, but never anything heavier. First thing I would do is find out what twist your rifle is. If it's a 1-10", then proceed; if it's a 1-12", forget it as there is not enough twist to stabilize the bullet. Assuming you have a 1-10" twist, get yourself some Winchester or Hornady Match brass. You need the lightest brass you can find, so that you can stuff as much of a slower burning powder as possible in that small case (that big bullet will take up space and reduce your case capacity). Next, get yourself some VihtaVouri N550 powder. RL19 will not work as it is too slow, and RL22 is REALLY too slow. You could use RL15, but N550 will work much better. Start low and work up, looking for pressure signs. Good luck.

Don

jr81452
July 1, 2007, 12:00 AM
thanks for the advice don. i do in fact have a 1:10 twist rate thus the query. already using fire formed lapua brass. i have been using 44.6gr behind the 168gr amax and 42.4 gr behind the 178gr amax with RL15 and a COL of 2.842" (0.002 behind the lands as my rifle prefers). the problem is that at my club the wind is usually about a 20mph crosswind and this throws the projectile out beyond the range of my scope without retuning the windage at 800 yards. i was hoping that the 208gr amax with its higher BC would stand up to the wind a bit better. thus my current problem. i am realy looking for a starting range with the RL15. i have plenty of data for other powders with similar burn rates (BL-c2 comes to mind) and this bullet weight but for some odd reason nothing beyond 180gr is listed by Alliant (guess they think that all .308 wins are 1:12 twist). even though Lyman has a load for 190gr SMKs with RL15. so if anybody has determined a start/stop point for RL15 with 200gr or heavier bullets, that would at least give me a rough guess as to how much to use when working out my pressure testing loads. really i just don't want to come home after the tests and take down a bunch of rounds that are way over on the pressure scale. and this rifle really seems to like RL15 (tried 6 others and RL15 was always more accurate)
thanks

Sunray
July 1, 2007, 12:20 AM
There's no data because 200 grains is max for the .308. The OAL will be too long with a 208 grain bullet. Hornady doesn't put data on-line. They want you to buy their manual.

jr81452
July 1, 2007, 07:57 AM
that is an interesting theory although i would ask where you are getting your information. it also seems that the folks at Lee, Hodgdon, and Accurate (to name a few) are not in agreement with you, as they all list a load for 220gr jacketed for the .308. Hodgdon alone lists no less than four powders suitable for a 250gr JB in .308. although admittedly the 250gr is almost certainly a RN or FP, i can see no reason why a 208gr amax loaded out to 2.842" would not allow for enough powder to push the bullet at a reasonable velocity. though we would be having a different conversation if i were loading for a semi-auto as 2.810 would be the max COL. if i am missing something please correct me.

Ol` Joe
July 1, 2007, 10:51 AM
Alliant, if you note, doesn`t list loads for the 308 Win with R19 or R22 on their web site for any bullet wgt let alone a long 208gr VLD style like the A-Max. These are likely too slow for the cartridge and not enough can be put in the case to achieve normal ballistics. The speer book I have in front of me (#13) is the same. R15 may work but the bullet you are looking at is new and I doubt there is much out there yet as to data. Especially from companies other then Hornady.
Hornady, as suggested is likely your best shot at getting data. They most likely wont give much though as they do sell data in their manuals and offering all they have for free would cut the manual sales.
Twist may be a problem too. Shilen recommends a 1/10 twist for bullets up to 220gr and a 1/8 for bullets over that. Hart also offers 1/8 308 cal barrels. There must be a reason or need for them in some instances. The bullets lenght, not its weight, is what dictates twist need and the extra long bullets such as the A & V-Max need more twist then std constructed bullets of the same wgt, especially if the velocities are on the lower side. The factories if you note don`t load bullets over 200 grs in their 308 ammo, this "MAY" be part of the reason. I am assuing on this though, it may acually have nothing to do with it.

USSR
July 1, 2007, 05:05 PM
jr81452,

The guys that are using RL15 with 190gr bullets are using 43.0 - 44.0gr of powder, depending upon the brass used. If I were you, with the 208 Amax I would use Winchester brass and start at 40.0gr of RL15 with a WLR primer, and work your way up in charge weight while checking your chronograph readings and looking for pressure signs. If you have a 24 - 26" barrel, I would be looking for 2500 - 2550fps and call it good.

Don

jr81452
July 1, 2007, 06:34 PM
thanks don! now that i have gotten some sleep that makes perfect sense. also looking through my load books again i noticed that lyman also lists a load for a 200gr SMK @ 37.5-42.0gr RL15 that i could have used to make my pressure testing loads. thanks for all the help guys.

If you enjoyed reading about "need load help" here in TheHighRoad.org archive, you'll LOVE our community. Come join TheHighRoad.org today for the full version!