QL Request for .308Win Semi-Auto

[garyw1911]

I have a very fussy Model 100 Win. for port pressure only 9" from the bolt face. I am requesting a Quickload run for 2 powders : 45.7gr of TAC ; and 43.6gr AR-Comp, with 1% steps either side. Details :FC GM brass (overflow capacity fired 54.4gr H2O) ; 22" BL 150gr Horn. SP #3031; OAL 2.800" and .054" Jump .
The 45.7gr of TAC and Fed210 ( 2789f/s and ES =9f/s) nearly duplicates the port pressure of 46.0gr of H335 GI surplus with the same bullet .
If interested this FC brass weighs 177 to 178 gr , and has the same case capacity as LC15 , WCC14 , WCC13 . LC14 has 0.5 gr less capacity. I have found a few samples of the LC Pull Down brass with neck thickness variations of .001" . I have never had that problem with the FC brass , which has now moved on to a very accurate bolt action in 7mm08 .
Neither Load is max in the manuals or in my rifle.

 

[preacher]

Good luck with that Mod 100. Its always been a nice handling, swell looking rifle, to me. I had one in .243 that was an "OK" shooter, 1 3/4-2 1/4" with 100gr factory loads. I tried to have it bedded, etc and it didn't help, so down the road it went, ha. Back in 1972, at the Rod & Gun Club where I was stationed as a soldier, I handled one of the Mod 100 .308 "Carbines". Since I was under 21, my Captain would not sign for me to buy it. Typical. Those are worth a lot of money now. The .308 was what I always wanted in one, but they have always been high priced, the .243 was only $350, but it was a bust, even at that price. Hope yours does well for you pard! Oh yeah, I don't remember the powder/load but my BIL has always used the Sierra 150 SBT in his Mod 742 .308. It is wicked on those East Texas deer and hogs too!

 

[Dwh7271]

Cartridge          : .308 Win. (SAAMI)
Bullet             : .308, 150, Hornady SP 3031
Useable Case Capaci: 49.486 grain H2O = 3.213 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : Ramshot TAC *C ?

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% 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

-10.0   84    41.13   2525    2124   42228   7449     93.9    1.204
-09.0   85    41.59   2552    2169   43528   7536     94.3    1.187
-08.0   85    42.04   2578    2214   44868   7623     94.7    1.171
-07.0   86    42.50   2605    2259   46248   7707     95.1    1.154
-06.0   87    42.96   2631    2306   47671   7790     95.5    1.138
-05.0   88    43.42   2657    2352   49138   7871     95.9    1.123
-04.0   89    43.87   2684    2399   50650   7950     96.2    1.108
-03.0   90    44.33   2710    2446   52209   8026     96.6    1.093
-02.0   91    44.79   2736    2494   53816   8101     96.9    1.078  ! Near Maximum !
-01.0   92    45.24   2762    2542   55474   8174     97.2    1.063  ! Near Maximum !
+00.0   93    45.70   2789    2590   57185   8244     97.5    1.049  ! Near Maximum !
+01.0   94    46.16   2815    2639   58949   8312     97.8    1.035  ! Near Maximum !
+02.0   95    46.61   2841    2688   60771   8377     98.0    1.021  ! Near Maximum !
+03.0   96    47.07   2867    2738   62650   8440     98.3    1.008  !DANGEROUS LOAD-DO NOT USE!
+04.0   97    47.53   2893    2788   64591   8501     98.5    0.995  !DANGEROUS LOAD-DO NOT USE!
+05.0   98    47.99   2919    2838   66596   8559     98.7    0.982  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 3% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 3% relative to nominal value:
+Ba     93    45.70   2828    2664   60084   8255     98.6    1.027  ! Near Maximum !
Data for burning rate decreased by 3% relative to nominal value:
-Ba     93    45.70   2746    2511   54308   8202     96.1    1.073  ! Near Maximum !

You didn't give me velocity on the other one so I ran it at default.

Cartridge          : .308 Win. (SAAMI)
Bullet             : .308, 150, Hornady SP 3031
Useable Case Capaci: 49.486 grain H2O = 3.213 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : Alliant AR-Comp *C *T

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% 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

-10.0   94    41.67   2728    2478   49518   7365    100.0    1.105
-09.0   95    42.13   2753    2524   51254   7403    100.0    1.089
-08.0   97    42.60   2778    2570   53055   7440    100.0    1.073  ! Near Maximum !
-07.0   98    43.06   2803    2616   54922   7477    100.0    1.058  ! Near Maximum !
-06.0   99    43.52   2827    2663   56858   7514    100.0    1.043  ! Near Maximum !
-05.0  100    43.99   2852    2709   58855   7549    100.0    1.028  ! Near Maximum !
-04.0  101    44.45   2877    2756   60917   7584    100.0    1.014  ! Near Maximum !
-03.0  102    44.91   2901    2803   63049   7618    100.0    1.000  !DANGEROUS LOAD-DO NOT USE!
-02.0  103    45.37   2925    2850   65256   7652    100.0    0.986  !DANGEROUS LOAD-DO NOT USE!
-01.0  104    45.84   2949    2897   67541   7685    100.0    0.972  !DANGEROUS LOAD-DO NOT USE!
+00.0  105    46.30   2974    2945   69908   7717    100.0    0.959  !DANGEROUS LOAD-DO NOT USE!
+01.0  106    46.76   2998    2993   72360   7749    100.0    0.945  !DANGEROUS LOAD-DO NOT USE!
+02.0  107    47.23   3022    3041   74902   7779    100.0    0.933  !DANGEROUS LOAD-DO NOT USE!
+03.0  108    47.69   3046    3090   77536   7809    100.0    0.920  !DANGEROUS LOAD-DO NOT USE!
+04.0  109    48.15   3070    3139   80268   7839    100.0    0.908  !DANGEROUS LOAD-DO NOT USE!
+05.0  110    48.62   3094    3188   83101   7867    100.0    0.895  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 3% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 3% relative to nominal value:
+Ba    105    46.30   2998    2995   74373   7627    100.0    0.939  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 3% relative to nominal value:
-Ba    105    46.30   2946    2890   65452   7818    100.0    0.980  !DANGEROUS LOAD-DO NOT USE!

 

[garyw1911]

Thanks Dwh for the excellent info. That 43.6gr charge of AR-Comp is listed on Alliant for 155gr Horn. VMax . I thought the pressure would be similar for the 150gr SP , with it's flat base. Preacher : thanks for your stories about your rifle. Mine has sentimental value : it was my dad's deer rifle. It killed lots of deer out to 200 yards . I have improved the accuracy somewhat by placing plastic shims on each side of the tang to take up side to side motion . I have shot 1" groups at 100 yards, just not as consistently as I would like. That AR-Comp is a proven performer in .223 , 60gr VMax in my bolt action . Maybe in 3 weeks the range will dry up for a new trial in .308 .

 

[Gunner46]

I have a fussy 308 carbine. Free floated the barrel, glass bedded the receiver & screws...Frustrating to be sure, but I landed on 180 BT's w/ RL-15. 7/8" groups at 2450 fps. Inside 200 yds it's MORE than enough for anything that might eat you.

 

[preacher]

gary- sounds like you got your rifle doing very well! My SIL has his dad's Mod 88 also in .308. Other than having a "somewhat spongey" trigger it is very accurate. There is a lot to be said for using any rifle/shotgun, etc with sentimental value. Very satisfying to my soul I know that, ha. I also handloaded that Hornady 150SP for a few friend's 30-06s. Wicked deer killer for sure. I shot it in the old Hornady "Frontier" .308 ammo in a Model 99 I had for awhile. It shot so well I didn't even handload for that particular rifle. Good luck to you Pard!

 

[preacher]

Gunner-is your "carbine" one of the older Mod 100s or a different rifle? I had one of the first Ruger 77 Ultralights" that was a pain- in recoil/face slap and to shoot accurately. I wasn't impressed with it at all. I traded it for a S&W Mod 29.

 

[thatguySHM]

I shoot an M88 in 308. I understand I'm not dealing with semi auto port pressure, but have had extremely accurate results with 165gr Hotcor bullets and MR2000 powder. I tried boat tail bullets and did not have any luck.

Unfortunately last season my sling popped off while shouldering the rifle on a snowy hunt and the stock shattered at the web. This summer I have to get the new laminate milled and fitted.

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