Win 748 for 308 Winchester?

[Lone_Gunman]

How well does Winchester 748 work for 308 Winchester?

I like the idea of using one powder for all my 223 and 308 needs. But how does 748 compare to Varget, etc for 308?

 

[Grumulkin]

I've used Win. 748 in the 308 Win. & it worked OK but IMR 4064 worked better for me so that's what I use. Varget would probably ge another good choice.

 

[GunTech]

What bullet? There are a number of loads for 308 and W748 that work fine, and it meters really well.

 

[Bad Flynch]

WW 748 can shoot quite well in the .308 Win or 7,62mm NATO cartridges, but it is much better with lighter bullets, say 168 grains or less. I had a National Match M1-A that liked that powder really well with Sierra 168 gr MatchKings. 150 grain hunting bullets would work quite well, too.

 

[Lone_Gunman]

I will be loading Hornday 150g SST bullets for hunting whitetail deer. How would 748 work for that?

 

[GunTech]

Assuming commercial 308 brass:

Cartridge          : .308 Win.
Bullet             : .308, 150, Hornady SST InterLock 30302
Cartridge O.A.L. L6: 2.800 inch or 71.12 mm
Barrel Length      : 24.0 inch or 610.0 mm
Powder             : Winchester 748

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.124% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-11.2   82    39.94   2517    2110   35690   6732     95.6    1.347
-10.1   83    40.45   2547    2161   36963   6817     96.0    1.328
-09.0   84    40.96   2578    2213   38281   6899     96.5    1.308
-07.9   85    41.46   2608    2266   39650   6978     96.9    1.287
-06.7   86    41.97   2638    2318   41069   7054     97.3    1.267
-05.6   87    42.47   2668    2372   42541   7128     97.7    1.247
-04.5   88    42.98   2699    2425   44069   7198     98.0    1.227
-03.4   89    43.48   2729    2480   45653   7265     98.3    1.208
-02.2   90    43.99   2758    2534   47299   7328     98.6    1.190
-01.1   91    44.49   2788    2590   49008   7388     98.9    1.171
+00.0   92    45.00   2818    2645   50783   7445     99.1    1.153
+01.1   93    45.51   2848    2701   52628   7497     99.3    1.136  ! Near Maximum !
+02.2   94    46.01   2877    2757   54543   7547     99.5    1.118  ! Near Maximum !
+03.4   95    46.52   2907    2814   56535   7592     99.6    1.102  ! Near Maximum !
+04.5   96    47.02   2936    2871   58607   7634     99.8    1.085  ! Near Maximum !
+05.6   97    47.53   2965    2928   60762   7671     99.9    1.069  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba     92    45.00   2939    2878   61395   7166    100.0    1.072  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     92    45.00   2647    2334   41213   7334     93.8    1.260

 

[karnaaj]

H 335 works well for both and it has the distinct advantage of metering far better than Varget.

 

[BsChoy]

H335 and W748 are the same aren't they?? Or is that 746?

 

[GooseGestapo]

Win748 was the "original" "ball" powder propellent and was developed for the .308(7.62x51mm).
Hence it is well adapted to the cartridge. Best results will come with 147-150gr bullets as was intended.

Win748 is actually near identical to BL-C2. Difference between the two has more to do with variations between lot#s.

My best accuracy with the .308 has been with IMR4064, Varget and RL-15. However, best velocities have been with BL-C2 (or 748).

For the 165-168gr bullets, IMR4064 has been the "winner".

 

[Lone_Gunman]

I thought 748 was developed for .223?

 

[waffentomas]

I use 748 exlusively in my .308, after messing around with Varget, 760, H4350, RL 15 and a couple of others. Nothing wrong with any of them, but my rifle seems to like 748 and 180gr bullets.

I shot this group with 43 gr of 748 and a Hornady 180gr Interlock SP. After one shot to try and get to the bull, three shots went into one hole at 100 yards, and measures .229" from center to center.

It's my all .308 powder and I have been thrilled with it. I'm not sure why people are saying it's a 165gr and up powder...it may be better for that, it's just my Weatherby Vanguard and 180gr bullets seem to do well with it.

I use the Barnes 180gr XLC and 44gr of 748 as my elk hunting load. When I run out of XLC I'll use up my 180gr Fail Safes. This load took down two elk this year.


Tom