I was curious so I played around with Quickload. I used the option that runs a bunch of powders to compare what they will do. I tweaked on the pressure setting (ended up at 29000 psi) to get something close to the 13 gr of HS6 used by the Op. Quickload uses breech to muzzle for barrel length so I estimated 7.3" (5.5" barrel plus an estimated 1.8" for cylinder).
With a Lee 300 gr, it says 1166 fps where the Op reports 1070 fps. So the 100 fps estimate loss for the cylinder gap by rintinglen is pretty darn close in this case. It is probably reasonable to adjust down the estimated velocities of the other powders below by the 100 fps.
The next nugget of "told you so" goes to Doug Guy for pointing to Lil Gun as being top choice for highest velocity (according to QL anyway). However - WARNING - the QL results for the top powders are above the "Ruger only" loads listed in the Hodgdon load data sheet found at https://www.rugerforum.net/threads/4...-lilgun.75519/.
Now for #9, the book load of 18.8 grs is more than the 18.3 shown by Quickload below. So I would guess that the Op could work up to at least 1150 fps or so. Really not that shabby at all.
Code:
Cartridge : .45 Colt (SAAMI)
Bullet : .452, 300, LEE C452-300-RF
Useable Case Capaci: 24.799 grain H2O = 1.610 cm³
Cartridge O.A.L. L6: 1.566 inch = 39.78 mm
Barrel Length : 7.3 inch = 184.4 mm
Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 29000 psi, or 199 MPa
or a maximum loading ratio or filling of 100 %
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 !
Powder type Filling/Loading Ratio Charge Charge Vel. Prop.Burnt P max P muzz B_Time
% Grains Gramm fps % psi psi ms
--------------------------------- -----------------------------------------------------------------
Hodgdon Lil'Gun 99.0 23.5 1.52 1339 87.5 29000 6626 0.729 ! Near Maximum !
Winchester 296 97.2 23.9 1.55 1314 76.2 29000 6364 0.740 ! Near Maximum !
Hodgdon H110 97.0 23.8 1.54 1294 80.1 29000 6057 0.747 ! Near Maximum !
Ramshot Enforcer 86.9 20.3 1.32 1281 88.4 29000 5688 0.750 ! Near Maximum !
Vihtavuori N105 *C 89.9 16.1 1.04 1271 99.7 29000 4984 0.747 ! Near Maximum !
Alliant 2400 85.7 18.6 1.21 1265 87.0 29000 5498 0.755 ! Near Maximum !
Accurate 4100 89.4 21.1 1.37 1256 83.4 29000 5397 0.752 ! Near Maximum !
Accurate No.7 68.0 16.6 1.08 1251 95.1 29000 5106 0.757 ! Near Maximum !
Lovex D037.1 67.5 16.6 1.08 1251 95.1 29000 5106 0.757 ! Near Maximum !
Accurate No.9 75.5 18.3 1.19 1245 89.8 29000 5162 0.755 ! Near Maximum !
Lovex D037.2 Heavy Pistol 74.7 18.3 1.19 1245 89.8 29000 5162 0.755 ! Near Maximum !
Hodgdon HS-6 57.7 13.1 0.85 1166 100.0 29000 3732 0.769 ! Near Maximum !
Alliant HERCO 79.3 11.4 0.74 1152 100.0 29000 3536 0.780 ! Near Maximum !
Alliant UNIQUE 70.1 10.3 0.67 1129 100.0 29000 3290 0.785 ! Near Maximum !
Alliant BULLSEYE 60.9 9.2 0.60 1118 100.0 29000 3206 0.778 ! Near Maximum !
IMR 4227 100.0 20.9 1.36 1117 66.2 23028 4455 0.834
Hodgdon Universal 64.6 9.5 0.61 1074 100.0 29000 2836 0.804 ! Near Maximum !
Winchester 231 55.2 9.5 0.62 1050 100.0 29000 2632 0.804 ! Near Maximum !
Alliant GREEN DOT 66.7 8.5 0.55 1025 100.0 29000 2493 0.818 ! Near Maximum !
Alliant RED DOT 67.7 7.7 0.50 999 100.0 29000 2342 0.830 ! Near Maximum !