Help w/ 458 Socom Load for 400gr PC CL

[RiskyBusiness]

this is using the lee 405gr mold but with powder coat they are at 420gr. My powders on hand are RL7, Unique, IMR3031(reserving this for my marlin), Varget. Open to buying lil gun/h110 in bulk if they can be used for a future beowulf load. I'd be open to also downsizing to a 300-350gr pc cast load but i need the fps to be under 1600 to prevent gas cutting/leading and so its not too recoil heavy.

I've found data for subsonics using Unique but im reading it probably wont cycle. Seems like most data is for 300 or 500gr bullets and the reason why im trying to stick with the 420s is because i already use these for my marlin 45-70.

• RL7 data has been scarce but i found a max load of 23gr RL 7 from quickload data

• Remington 405gr 35grs RL7 but i would down that to 30grs max for cast and the larger size difference

If any of you have experience or have data for a 400gr load using RL7 it'd be very helpful.

[ar15barrels]

Here is a Quickload RL7 pass with the Lee 405:

Cartridge          : .458 Socom
Bullet             : .457, 405, LEE 457-405-F
Useable Case Capaci: 49.818 grain H2O = 3.235 cm³
Cartridge O.A.L. L6: 2.310 inch = 58.67 mm
Barrel Length      : 16.0 inch = 406.4 mm
Powder             : Alliant Reloder-7

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.625% 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

-06.3   84    37.50   1541    2134   26227   4437     91.7    1.385
-05.6   85    37.75   1551    2163   26733   4472     92.0    1.373
-05.0   86    38.00   1561    2191   27247   4507     92.3    1.361
-04.4   86    38.25   1571    2219   27771   4541     92.5    1.350
-03.8   87    38.50   1581    2248   28303   4575     92.8    1.338
-03.1   87    38.75   1591    2277   28844   4608     93.1    1.327
-02.5   88    39.00   1601    2306   29395   4642     93.4    1.316
-01.9   88    39.25   1611    2335   29955   4674     93.6    1.305  ! Near Maximum !
-01.3   89    39.50   1621    2364   30524   4707     93.9    1.294  ! Near Maximum !
-00.6   89    39.75   1631    2394   31104   4739     94.1    1.284  ! Near Maximum !
+00.0   90    40.00   1642    2423   31693   4771     94.4    1.273  ! Near Maximum !
+00.6   91    40.25   1652    2453   32292   4802     94.6    1.263  ! Near Maximum !
+01.3   91    40.50   1662    2483   32902   4833     94.9    1.252  ! Near Maximum !
+01.9   92    40.75   1672    2513   33523   4863     95.1    1.242  ! Near Maximum !
+02.5   92    41.00   1682    2543   34154   4894     95.3    1.232  ! Near Maximum !
+03.1   93    41.25   1692    2573   34796   4923     95.5    1.222  !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     90    40.00   1731    2695   38544   4818     98.8    1.175  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     90    40.00   1527    2097   25204   4506     86.4    1.402

Here is a powder chooser pass:

Cartridge          : .458 Socom
Bullet             : .457, 405, LEE 457-405-F
Useable Case Capaci: 49.818 grain H2O = 3.235 cm³
Cartridge O.A.L. L6: 2.310 inch = 58.67 mm
Barrel Length      : 16.0 inch = 406.4 mm

Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 35000 psi, or 241 MPa
or a maximum loading ratio or filling of 102 %
These calculations refer to your specified settings in QuickLOAD 'Cartridge Dimensions' window.
C A U T I O N : any load listed can result in a powder charge that falls below minimum suggested
loads or exceeds maximum suggested loads as presented in current handloading manuals. Understand
that all of the listed powders can be unsuitable for the given combination of cartridge, bullet
and gun. Actual load order can vary, depending upon lot-to-lot powder and component variations.
USE ONLY FOR COMPARISON !

45 loads produced a Loading Ratio below user-defined minimum of 75%. These powders have been skipped.
Powder type          Filling/Loading Ratio  Charge    Charge   Vel. Prop.Burnt P max  P muzz  B_Time
                                      %     Grains    Gramm   fps     %       psi     psi    ms
---------------------------------  -----------------------------------------------------------------
Norma 200                           98.7     44.3     2.87    1745    96.1    35000    5380   1.216  !DANGEROUS LOAD-DO NOT USE!
Alliant Reloder-10x                101.8     44.1     2.86    1744    95.0    35000    5383   1.197  !DANGEROUS LOAD-DO NOT USE!
SNPE Vectan SP 10                   97.5     47.9     3.10    1725    88.4    35000    5411   1.195  !DANGEROUS LOAD-DO NOT USE!
Hodgdon H335                        97.8     49.0     3.18    1719    88.0    35000    5418   1.195  !DANGEROUS LOAD-DO NOT USE!
Vihtavuori N120                     96.9     40.7     2.63    1706    99.5    35000    4721   1.202  !DANGEROUS LOAD-DO NOT USE!
Hodgdon H322                       102.0     45.5     2.95    1696    89.1    33715    5262   1.214  ! Near Maximum !
Alliant Reloder-7                   93.0     41.3     2.68    1695    95.6    35000    4932   1.219  !DANGEROUS LOAD-DO NOT USE!
Vihtavuori N125                     90.5     38.6     2.50    1693    99.4    35000    4645   1.212  !DANGEROUS LOAD-DO NOT USE!
Accurate 2230                      101.8     50.6     3.28    1693    83.0    35000    5152   1.204  !DANGEROUS LOAD-DO NOT USE!
Alliant Reloder-12                 102.0     47.8     3.09    1690    89.4    34278    5154   1.210  !DANGEROUS LOAD-DO NOT USE!
Accurate 2460                      102.0     50.4     3.27    1690    85.0    32657    5299   1.236  ! Near Maximum !
IMR 4198                            97.0     39.9     2.59    1688    95.8    35000    4830   1.201  !DANGEROUS LOAD-DO NOT USE!
Winchester 748                     102.0     50.4     3.27    1688    83.1    33609    5402   1.219  ! Near Maximum !
Vihtavuori N130                    102.0     43.8     2.84    1682    94.1    34079    4920   1.221  ! Near Maximum !
Vihtavuori N530                    102.0     47.1     3.05    1676    83.4    33394    5180   1.225  ! Near Maximum !
Ramshot X-Terminator               101.4     49.7     3.22    1672    81.4    35000    5019   1.212  !DANGEROUS LOAD-DO NOT USE!
Hodgdon H4227                       87.3     36.7     2.38    1672    98.4    35000    4558   1.209  !DANGEROUS LOAD-DO NOT USE!
Accurate 2200                       93.1     43.4     2.81    1672    87.6    35000    4908   1.214  !DANGEROUS LOAD-DO NOT USE!
Accurate 2015                      102.0     44.8     2.90    1669    92.1    30777    5129   1.268  ! Near Maximum !
Accurate 1680                       84.5     40.5     2.62    1669    92.0    35000    4788   1.216  !DANGEROUS LOAD-DO NOT USE!
Hodgdon Benchmark                  102.0     46.1     2.99    1665    85.4    34796    4914   1.219  !DANGEROUS LOAD-DO NOT USE!
IMR 4227                            85.7     36.0     2.33    1650    97.5    35000    4436   1.217  !DANGEROUS LOAD-DO NOT USE!
Accurate 5744                       76.9     33.8     2.19    1649    95.8    35000    4578   1.219  !DANGEROUS LOAD-DO NOT USE!
Alliant AR-Comp                    102.0     45.3     2.94    1643    92.3    28684    5336   1.294
Hodgdon H4198                       92.3     39.8     2.58    1642    90.0    35000    4560   1.220  !DANGEROUS LOAD-DO NOT USE!
IMR 8208 XBR                       102.0     46.8     3.04    1637    82.1    31649    4972   1.258  ! Near Maximum !
Hodgdon CFE223                     102.0     52.2     3.38    1633    77.2    31752    5206   1.258  ! Near Maximum !
Ramshot Wild Boar                  102.0     50.1     3.24    1626    78.0    31137    5047   1.267  ! Near Maximum !
Ramshot TAC                        102.0     50.5     3.27    1624    75.3    32797    4847   1.249  ! Near Maximum !
Vihtavuori N110                     81.8     31.8     2.06    1624   100.0    35000    3847   1.241  !DANGEROUS LOAD-DO NOT USE!
Hodgdon BL-C2                      102.0     51.1     3.31    1617    78.8    29204    5210   1.295
Hodgdon H4895                      102.0     46.8     3.04    1604    78.8    28553    5012   1.310
Accurate 2520                      102.0     49.4     3.20    1592    81.3    26631    5136   1.342
Norma 202                          102.0     46.1     2.99    1589    83.7    27230    4970   1.334
SNPE Vectan SP 9                   102.0     48.4     3.13    1577    76.7    28690    4813   1.315
Vihtavuori N133                    102.0     42.9     2.78    1571    89.0    28206    4562   1.323
SNPE Vectan SP 7                   102.0     50.3     3.26    1567    73.4    28530    4705   1.321
Norma 201                          102.0     45.8     2.97    1558    79.4    26140    4803   1.373
Vihtavuori N540                    102.0     47.4     3.07    1544    81.5    25645    4828   1.374
Vihtavuori N140                    102.0     45.9     2.98    1540    82.8    26127    4666   1.366
IMR 3031                           102.0     43.8     2.84    1540    82.9    24437    4955   1.397