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-   -   Help with W748 308 load. (http://www.firearmstalk.com/forums/f30/help-w748-308-load-94544/)

Apex-Predator 07-28-2013 02:18 AM

Help with W748 308 load.
 
Have been trying to work up a 180gr load for my fantastic M70 Featherweight 308, I tried most of the loads in my "go to" Nolser manual with so-so results, but then I tried a load off the IMR/Winchester site. I worked up to the max load of 46.5gr of W748 and it shot fantastic (.4" groups), upon posting my results I was informed that I was shooting a 70,000+psi load! Or at leased that is what Quickload said anyway, my rifle showed no clear pressure signs and IMR/Winchester says that load is only 48,500CUP, but on the flip side again 46.5gr of W748 is a bit higher then anyone elses max load which is usually around 44gr.
What are your thoughts? Is this load playing with fire, or is IMR/Winchester right in calling this a safe load?

mseric 07-28-2013 02:56 AM

What 180gr bullet are you loading?

Did you shoot these over a Chrony?

What is your barrel length?

Can you give me your case capacity in grains of H20? Take a fired case. weigh it. Fill it with H20 and weigh again, subtract and that is your case capacity in grains of H20.

Did you work up to 46.5gr?

Your load is up there, but I can't say that it is over pressure, depending on your bullet, there is data to support the charge.

I'll run QL for you if you can supply me with the case capacity, barrel length and bullet.

Apex-Predator 07-28-2013 09:52 PM

Sierra Game King 180gr, VERY similar to the 180gr Speer BTSP used my IMR/Winchester, yes I did work up from 43gr, length is 2.800", barrel is a 22" (1:12" twist Winchester factory), no I did not chrono but it did kick hard for a 308 and POI was almost an inch above my factory 150gr Core-Lokt zero. I would get you my case readings but I am out of town at the moment and did not bring any brass with me. I used Remington brass for that load, FL resized of course. That rifle gets a sticky bolt pretty easy and that load extracted just fine.

JonM 07-29-2013 03:18 AM

any reason for 180 grain bullets??

thats not really a good bullet for the 308 and is something you would use in a 30-06 or 300winmag.

when your running close to or at the book max you need to be wary of things like your barrel length vs the test barrel, are you using the exact same cases primers and exact same bullets??

heavy bullets can be accurate in the 308 but they generally lack the case capacity to safely ramp the speed up.

Txhillbilly 07-29-2013 04:19 AM

If your not seeing high pressure signs on your brass,I wouldn't worry about it too much.
Most published load data is well below the maximum limits on any caliber,although most accurate loads are well below maximum powder charges.

I would also choose a lighter bullet to hunt with in a 308,I prefer 165 or 168 grain hunting bullets,but I do shoot heavier target bullets out of my 308.

Apex-Predator 07-29-2013 05:02 PM

165gr was my first choice but my rifle simply does not like them at all, tried SKGs, SSTs, BTs, amongst others, with most suitable 308 powders (RL15, Varget, W748....etc) and the best group I had was a marginal 1.25" so I decided to use either 150gr or 180gr both of which shot .5" or better off the bench. I have always preferred heavy bullets over light and faster ones in the woods. I don't need or want hypersonic speed in my 308, that is my woods rifle so even a "slow" 180gr should preform well inside 150 yards assuming I am using a fast expanding bullet like a SGK, SST, or Speer BTSP. I have a 270WSM for when I want to push lead to 3,400fps.

Apex-Predator 07-29-2013 05:31 PM

Not doubting that the 150gr 308 could work but a 165gr is the smallest 30 cal I have ever used on game, I REALLY like exit wound in thick brush and I don't have as much confidence in a lighter projectile. Maybe the 150gr Speer BTSP will exceed my expectations but I know for a fact that a 180gr smashes bone and keeps on going.

mseric 07-29-2013 05:48 PM

Quote:

Originally Posted by Apex-Predator (Post 1319153)
Not doubting that the 150gr 308 could work but a 165gr is the smallest 30 cal I have ever used on game, I REALLY like exit wound in thick brush and I don't have as much confidence in a lighter projectile. Maybe the 150gr Speer BTSP will exceed my expectations but I know for a fact that a 180gr smashes bone and keeps on going.


Use what you have confidence in and are comfortable with. If that is the 180gr then go with it and don't let anyone talk you into a bullet you do not have total faith in.

JonM 07-31-2013 02:04 AM

Quote:

Originally Posted by Apex-Predator (Post 1319153)
Not doubting that the 150gr 308 could work but a 165gr is the smallest 30 cal I have ever used on game, I REALLY like exit wound in thick brush and I don't have as much confidence in a lighter projectile. Maybe the 150gr Speer BTSP will exceed my expectations but I know for a fact that a 180gr smashes bone and keeps on going.

i used a 150 grain a-max from hornady last hunting season in my scar17. that is one NASTY bullet. you know how some hollywood movies you see that red mist.... this bullet produces that with shot to the boiler room.

took two deer, one was chest shot it liquified the heart and lungs with a complete pass through leaving huge chunks of tissue and a massive blood pool the deer just dropped. i could see where the spray landed on the ground and vegatation. tracking that sort of trail you woulda had to be blind if the deer wandered off.

the second one i did a neck shot and it all but decapitated the deer.

both shots went through. the only guns i have that perform equal are my 45-70 and 458 winmag.

im so impressed by the amax i put those in my ohsht scar mags.

i highly recomend getting some load em up and give em a try

Apex-Predator 08-01-2013 04:21 AM

That damage sounds like what my 165gr 30-06 load does, no joke it left a basketball sized exit wound on the last deer of last season, SGKs at 2900fps speeds make a mess of a deer on close ranged shots. Neck, shoulder and back were all blown out like it had swallowed a hand grenade, while that makes for lightening quick ethical kills that is more meat damage then I care for.


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