QuickLoads pressure check please...

[oldfart1956]

Fellers I don't have QuickLoads and can't seem to find much pressure info so if anyone has some time and wouldn't mind. I wanted to ascertain pressure data using Unique in 45/70 loads. Can't find any data from the manufacturers and don't have any old books to double-check. Anyways, 45/70 using 11/11.5/12gr. of Unique, Lee 405h.b. boolit, R.P. case and primers, Felix lube and O.A.L. of 2.550 with no wads or fillers. I understand it will be estimated and not exact. Many thanks in advance. Audie...the Oldfart...

[RBurke44]

Fellers I don't have QuickLoads and can't seem to find much pressure info so if anyone has some time and wouldn't mind. I wanted to ascertain pressure data using Unique in 45/70 loads. Can't find any data from the manufacturers and don't have any old books to double-check. Anyways, 45/70 using 11/11.5/12gr. of Unique, Lee 405h.b. boolit, R.P. case and primers, Felix lube and O.A.L. of 2.550 with no wads or fillers. I understand it will be estimated and not exact. Many thanks in advance. Audie...the Oldfart...

I have Quickload. I plugged in your info and Quickload says: For a 45-70, 11.5/Unique/400 grain lead bullet. Predicted velocity is 1070 fps with a pressure of 12825 psi. I use a seating depth of .300, start pressure of 1000, and 400 gr lead lubed bullet. A jacketed 400 grain would not be much different but with a start pressure of about 1600. Bullet diameter used was .458.
Barrel length used was 24". Max allowed pressure would be 28,000. Hope this helps.. Email if you need more info.

[oldfart1956]

RBurke44....many thanks my friend for the timely response. I owe you one! Audie....the OLdfart..

[Kull]

Cartridge : .45-70 Govt. SAAMI
Bullet : .459, 405, LEE 459-405-HB
Useable Case Capaci: 55.666 grain H2O = 3.614 cm³
Cartridge O.A.L. L6: 2.550 inch = 64.77 mm
Barrel Length : 22.0 inch = 558.8 mm
Powder : Alliant UNIQUE

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% 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

-20.0 28 9.20 960 829 10932 865 100.0 2.770
-18.0 29 9.43 974 853 11384 884 100.0 2.725
-16.0 29 9.66 987 877 11843 903 100.0 2.682
-14.0 30 9.89 1001 901 12310 921 100.0 2.635
-12.0 31 10.12 1014 924 12783 940 100.0 2.590
-10.0 31 10.35 1027 948 13264 959 100.0 2.548
-08.0 32 10.58 1040 972 13752 978 100.0 2.507
-06.0 33 10.81 1052 996 14247 996 100.0 2.467
-04.0 33 11.04 1065 1019 14749 1015 100.0 2.430
-02.0 34 11.27 1077 1043 15259 1034 100.0 2.393
+00.0 35 11.50 1089 1067 15775 1052 100.0 2.359
+02.0 35 11.73 1101 1091 16298 1071 100.0 2.325
+04.0 36 11.96 1113 1114 16828 1089 100.0 2.293
+06.0 37 12.19 1125 1138 17365 1108 100.0 2.262
+08.0 38 12.42 1137 1162 17908 1126 100.0 2.232
+10.0 38 12.65 1148 1186 18459 1145 100.0 2.203

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 35 11.50 1098 1085 17423 1039 100.0 2.289
Data for burning rate decreased by 10% relative to nominal value:
-Ba 35 11.50 1076 1042 13988 1071 100.0 2.453


This is with the QL standard case capacity for 45-70 of 79.0 gr H2O. QL says that LEE 459-405-HB is 1.010" long and with an OAL of 2.550" seats 0.565".

[oldfart1956]

You guys are incredible. Kull may I assume you wouldn't mind if I print up a copy of the data for my records? I did notice my boolit seems to be casting a tad long at 1.070 probably due to a bit of flashing on the nose. May have to trim that a bit with the Forster if I can figger out how to make it trim something that short. (blade won't contact the nose at present) Again, many thanks to you both for the excellent return. Audie...the Oldfart..

[Kull]

Kull may I assume you wouldn't mind if I print up a copy of the data for my records?

You assume correctly. :drinks: