Quick load request. My laptop is down.

[8MMX57JS]

Hi guys. My lap down is down, so I can't access my quick load program.

If anyone has the time, that would much appreciated. Looking for some loads for 8x68s with IMR 4350.

Coal. 3.560"
H20 capacity from rws brass 86.5gr
Barrel length 25.5"

Bullets im looking at is Sierra Game Kings 220, 200 nosler accubonds, and 180gr barnes TSX.

Thank-you!

 

[DrMike]

Cartridge          : 8 x 68 S
Bullet             : .323, 200, Nosler AccuBond 54374
Useable Case Capaci: 76.676 grain H2O = 4.978 cm³
Cartridge O.A.L. L6: 3.560 inch = 90.42 mm
Barrel Length      : 25.5 inch = 647.7 mm
Powder             : IMR 4350

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   89    62.82   2658    3138   46164   9055     97.3    1.364
-09.0   90    63.52   2685    3203   47604   9146     97.6    1.345
-08.0   91    64.22   2713    3268   49087   9234     97.9    1.326
-07.0   92    64.91   2740    3333   50615   9318     98.2    1.308
-06.0   93    65.61   2767    3399   52191   9400     98.4    1.289
-05.0   94    66.31   2793    3465   53815   9479     98.7    1.272
-04.0   95    67.01   2820    3532   55488   9554     98.9    1.254  ! Near Maximum !
-03.0   96    67.71   2847    3600   57214   9626     99.1    1.237  ! Near Maximum !
-02.0   97    68.40   2874    3667   58994   9694     99.3    1.220  ! Near Maximum !
-01.0   98    69.10   2900    3736   60829   9759     99.4    1.204  ! Near Maximum !
+00.0   99    69.80   2927    3804   62722   9821     99.6    1.187  ! Near Maximum !
+01.0  100    70.50   2953    3873   64675   9878     99.7    1.171  !DANGEROUS LOAD-DO NOT USE!
+02.0  101    71.20   2980    3943   66690   9933     99.8    1.156  !DANGEROUS LOAD-DO NOT USE!
+03.0  102    71.89   3006    4012   68770   9983     99.9    1.140  !DANGEROUS LOAD-DO NOT USE!
+04.0  103    72.59   3032    4082   70917  10029     99.9    1.125  !DANGEROUS LOAD-DO NOT USE!
+05.0  104    73.29   3058    4153   73133  10072    100.0    1.110  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba     99    69.80   2985    3956   68077   9666    100.0    1.147  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba     99    69.80   2858    3626   57407   9858     98.2    1.234  ! Near Maximum !

 

[DrMike]

Cartridge          : 8 x 68 S
Bullet             : .323, 220, Sierra SPBT 2420
Useable Case Capaci: 77.444 grain H2O = 5.028 cm³
Cartridge O.A.L. L6: 3.560 inch = 90.42 mm
Barrel Length      : 25.5 inch = 647.7 mm
Powder             : IMR 4350

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   87    61.92   2560    3201   46765   9099     98.4    1.415
-09.0   88    62.61   2585    3265   48188   9183     98.7    1.396
-08.0   89    63.30   2610    3329   49652   9263     98.9    1.377
-07.0   90    63.98   2636    3393   51158   9341     99.1    1.358
-06.0   91    64.67   2661    3458   52709   9415     99.3    1.340
-05.0   92    65.36   2686    3524   54304   9487     99.4    1.322  ! Near Maximum !
-04.0   93    66.05   2711    3589   55947   9554     99.6    1.304  ! Near Maximum !
-03.0   94    66.74   2736    3656   57638   9619     99.7    1.286  ! Near Maximum !
-02.0   95    67.42   2760    3722   59379   9680     99.8    1.269  ! Near Maximum !
-01.0   96    68.11   2785    3789   61172   9737     99.9    1.253  ! Near Maximum !
+00.0   97    68.80   2809    3856   63018   9791     99.9    1.236  ! Near Maximum !
+01.0   98    69.49   2834    3923   64920   9842    100.0    1.220  !DANGEROUS LOAD-DO NOT USE!
+02.0   99    70.18   2858    3991   66880   9888    100.0    1.204  !DANGEROUS LOAD-DO NOT USE!
+03.0  100    70.86   2883    4059   68899   9931    100.0    1.189  !DANGEROUS LOAD-DO NOT USE!
+04.0  101    71.55   2907    4127   70980   9973    100.0    1.173  !DANGEROUS LOAD-DO NOT USE!
+05.0  102    72.24   2931    4196   73125  10014    100.0    1.158  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba     97    68.80   2860    3995   68260   9601    100.0    1.196  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba     97    68.80   2748    3689   57796   9895     99.1    1.283  ! Near Maximum !

 

[DrMike]

Cartridge          : 8 x 68 S
Bullet             : .323, 180, Barnes 'TSX' BT 30396
Useable Case Capaci: 79.207 grain H2O = 5.143 cm³
Cartridge O.A.L. L6: 3.560 inch = 90.42 mm
Barrel Length      : 25.5 inch = 647.7 mm
Powder             : IMR 4350

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   91    65.88   2795    3123   46011   9310     96.2    1.303
-09.0   92    66.61   2825    3189   47473   9408     96.6    1.285
-08.0   93    67.34   2854    3255   48982   9504     97.0    1.266
-07.0   94    68.08   2883    3322   50538   9597     97.3    1.248
-06.0   95    68.81   2912    3389   52143   9686     97.6    1.231
-05.0   96    69.54   2941    3457   53799   9772     97.9    1.213
-04.0   97    70.27   2970    3526   55508   9855     98.2    1.196  ! Near Maximum !
-03.0   98    71.00   2999    3595   57271   9935     98.5    1.180  ! Near Maximum !
-02.0   99    71.74   3028    3664   59092  10011     98.7    1.163  ! Near Maximum !
-01.0  100    72.47   3057    3734   60971  10083     98.9    1.147  ! Near Maximum !
+00.0  101    73.20   3085    3805   62912  10152     99.1    1.131  ! Near Maximum !
+01.0  102    73.93   3114    3875   64916  10217     99.3    1.116  !DANGEROUS LOAD-DO NOT USE!
+02.0  103    74.66   3142    3947   66987  10279     99.5    1.101  !DANGEROUS LOAD-DO NOT USE!
+03.0  104    75.40   3171    4019   69126  10336     99.6    1.085  !DANGEROUS LOAD-DO NOT USE!
+04.0  105    76.13   3199    4091   71337  10389     99.7    1.071  !DANGEROUS LOAD-DO NOT USE!
+05.0  106    76.86   3228    4163   73623  10438     99.8    1.056  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba    101    73.20   3151    3967   68357  10043     99.9    1.092  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba    101    73.20   3008    3617   57518  10141     97.4    1.176  ! Near Maximum !

 

[8MMX57JS]

Thank-you! Interesting to see. I had some loads tested with 67gr and 220gr for average of 2813 fps and .7" group and 72gr with 180s at 3140 fps.

 

[salmonchaser]

3140 is smoking!

 

[DrMike]

I do love he 8X68. It is a hammer. I let my 325 WSM go, but I kept the 8X68. Wonderfully accurate rifle.

 

[8MMX57JS]

3140 is smoking!

I'm hoping to match RWS factory velocity. They have the 187gr H-mantle at 3180 fps, and my rifle actually shot them at the exact same velocity as the listed velocity. With a bullet 7 grains lighter Id like to see 3200 fps.

 

[salmonchaser]

Getting close.

 

[8MMX57JS]

Got back out to the range, pretty much got to where I wanted to.

180's 3190 fps

200's

220's- Best accuracy was this load but bolt lift was bit heavy. Going to back off this load and stick with the original 67gr pictured above.

 

[FOTIS]

Man I can not wait for my 8mm Rem Mag to get back from Pac-Nor!

Impressive #'s BTW

Them 180's are doing almost 300 Bee Velocities.

 

[8MMX57JS]

I too am impressed, especially with the given powder, nothing special about imr 4350. Efficient magnum performance from the given powder charges and velocities/ accuracy achieved.

I worked up to 67, 68, 69 for the 220's. 72-73.5gr for the 180's, 70-70.5 for the 200's. I'd like to use the 220's for moose this year.

I plan on packing two rifles, the 8x68s for longer shots and a 8x57 for closer, mid range shots.

 

[TackDriver284]

Good velocities. Are you using monos with the 180?

 

[8MMX57JS]

Good velocities. Are you using monos with the 180?

Yes, 180 Barnes TSX.

 

[TackDriver284]

Yes, 180 Barnes TSX.

Long ago I tried 150 TSX with the 7 Mag and 7 STW ( 8mm wildcat ) , but it was so fussy to shoot well, so i dropped it never to use again. Your TSX grouping is not shabby at all. Your speed at 3190 fps is smoking. Recently I did work up a load at 95 degrees and maxed out with the 180 TTXS for my 300 WM at 3260 fps and I was impressed with the accuracy and speed. Backed off half a grain to 3240 fps and shoots great at that node, its with RL 25 and more likely I will see temp swings since its temp sensitive but it won't matter at the distance I'm shooting at under 300 yards. I like to try the TTSX on tough nilgai soon.
What are your intention on type of game to shoot the TSX on ?