After much internet searching I ran into this page of official trailboss load data from IMRs website.
IMR HANDGUN DATA
TRAIL BOSS
NEVER Exceed the Loads Listed Here
STARTING LOADS MAXIMUM LOADS
POWDER GRS. VEL. PRESSURE GRS. VEL. PRESSURE
32 S&W LONG
Case: Remington
Twist: 1:18.75"
Barrel: 5.32"
Trim: .915"
Primer: CCI 500
Bullet: 90 GR. HDY LSWC
Dia. .314"
COL: 1.185"
Trail Boss
1.5
599
5,900 CUP
2.0
730
8,100 CUP
32 H&R MAGNUM
Case: Federal
Twist: 1:16"
Barrel: 5"
Trim: 1.070"
Primer: Federal 100
Bullet: 90 GR. HDY LSWC
Dia. .314"
COL: 1.350"
Trail Boss
2.4
751
10,700 CUP
2.8
785
11,300 CUP
32-20 WINCHESTER
Case: Remington
Twist: 1:20"
Barrel: 5.5"
Trim: 1.305"
Primer: Winchester SP
Bullet: 90 GR. LRNFP
Dia. .314"
COL: 1.490"
Trail Boss
2.5
785
11,400 CUP
2.8
830
13,900 CUP
Bullet: 115 GR. LRNFP
Dia. .314"
COL: 1.580"
Trail Boss
2.2
642
11,300 CUP
2.5
707
15,300 CUP
38 SHORT COLT
Case: Starline
Twist: 1:16"
Barrel: 7.5"
Trim: .755"
Primer: Federal 100M
Bullet: 93 GR. AA206 LRN
Dia. .359"
COL: 1.005"
Trail Boss
1.7
575
2.0
674
Bullet: 135 GR. AA202 LFP
Dia. .358"
COL: 1.135"
Trail Boss
1.5
490
1.7
526
38 LONG COLT
Case: Starline
Twist: 1:16"
Barrel: 7.5"
Trim: 1.012"
Primer: Federal 100M
Bullet: 125 GR. LRN
Dia. .358"
COL: 1.400"
Trail Boss
2.0
622
2.4
705
Bullet: 150 GR. LRNFP
Dia. .358"
COL: 1.390"
Trail Boss
1.8
541
2.0
575
38 SPECIAL
Case: Winchester
Twist: 1:18.75"
Barrel: 7.7"
Trim: 1.145"
Primer: Winchester SP
Bullet: 125 GR. LRNFP
Dia. .358"
COL: 1.445"
Trail Boss
3.0
753
11,600 CUP
5.3
952
13,400 CUP
Bullet: 158 GR. LSWC
Dia. .357"
COL: 1.455"
Trail Boss
2.7
661
11,400 PSI
4.2
804
13,700 CUP
357 MAGNUM
Case: Winchester
Twist: 1:18.75"
Barrel: 10"
Trim: 1.285"
Primer: Winchester SPM
Bullet: 125 GR. LRNFP
Dia. .358"
COL: 1.580"
Trail Boss
3.5
874
14,900 CUP
5.3
1035
17,900 CUP
Bullet: 158 GR. LRNFP
Dia. .358"
COL: 1.610"
Trail Boss
3.2
754
16,500 CUP
4.2
865
20,400 CUP
38-40 WINCHESTER
Case: Winchester
Twist: 1:36"
Barrel: 5.5"
Trim: 1.295"
Primer: Winchester LP
Bullet: 180 GR. LRNFP
Dia. .401"
COL: 1.600"
Trail Boss
4.5
694
7,300 PSI
5.5
800
9,900 PSI
41 REM MAG
Case: Remington
Twist: 1:18.75"
Barrel: 10.125"
Trim: 1.280"
Primer: Winchester LP
Bullet: 215 GR. CAST LFP
Dia. .410"
COL: 1.600"
Trail Boss
4.5
752
13,000 CUP
6.5
910
17,100 CUP
Bullet: 245 GR. CAST LSWC
Dia. .410"
COL: 1.630"
Trail Boss
3.5
683
12,600 CUP
6.0
834
16,100 CUP
Bullet: 250 GR. WFNGC
Dia. .410"
COL: 1.540"
Trail Boss
3.7
611
14,600 CUP
5.0
748
20,300 CUP
44 RUSSIAN
Case: Starline
Twist: 1:20"
Barrel: 8"
Trim: .960"
Primer: Winchester LP
Bullet: 165 GR. LRNFP
Dia. .430"
COL: 1.165"
Trail Boss
3.3
742
7,600 CUP
4.5
878
11,600 CUP
Bullet: 200 GR. LRNFP
Dia. .430"
COL: 1.245"
Trail Boss
3.0
647
7,900 CUP
3.9
747
10,400 CUP
Bullet: 240 GR. LRNFP
Dia. .430"
COL: 1.275"
Trail Boss
3.0
604
8,800 CUP
3.5
661
10,000 CUP
44 COLT
Case: Starline
Twist: 1:20"
Barrel: 8"
Trim: 1.09"
Primer: Federal 150M
Bullet: 165 GR. LRNFP
Dia. .430"
COL: 1.310"
Trail Boss
3.3
698
5,400 CUP
4.5
844
9,700 CUP
Bullet: 185 GR. LRNFP
Dia. .430"
COL: 1.350"
Trail Boss
3.2
643
5,600 CUP
4.0
751
9,600 CUP
Bullet: 200 GR. LRNFP
Dia. .430"
COL: 1.370"
Trail Boss
3.0
595
4,800 CUP
3.9
711
9,300 CUP
Bullet: 240 GR. LRNFP
Dia. .430"
COL: 1.380"
Trail Boss
3.0
563
6,800 CUP
3.4
625
9,000 CUP
44-40 WINCHESTER
Case: Winchester
Twist: 1:36"
Barrel: 5.5"
Trim: 1.295"
Primer: Winchester LP
Bullet: 200 GR. LRNFP
Dia. .430"
COL: 1.600"
Trail Boss
5.5
723
7,800 PSI
6.5
826
11,900 PSI
44 SPECIAL
Case: Starline
Twist: 1:20"
Barrel: 8"
Trim: 1.55"
Primer: Winchester LP
Bullet: 165 GR. LRNFP
Dia. .430"
COL: 1.365"
Trail Boss
4.8
865
10,700 CUP
7.0
1005
12,100 CUP
Bullet: 185 GR. LRNFP
Dia. .430"
COL: 1.400"
Trail Boss
4.5
791
10,400 CUP
6.6
944
12,600 CUP
Bullet: 200 GR. LRNFP
Dia. .430"
COL: 1.450"
Trail Boss
4.3
757
8,700 PSI
6.3
885
13,200 CUP
Bullet: 240 GR. LSWC
Dia. .430"
COL: 1.450"
Trail Boss
4.0
673
9,700 CUP
5.2
763
11,700 CUP
44 MAGNUM
Case: Winchester
Twist: 1:20"
Barrel: 8.275"
Trim: 1.280"
Primer: Remington 2 1/2
Bullet: 165 GR. LRNFP
Dia. .430"
COL: 1.500"
Trail Boss
6.0
960
17,200 PSI
8.0
1086
18,800 PSI
Bullet: 185 GR. LRNFP
Dia. .430"
COL: 1.540"
Trail Boss
6.2
936
19,500 PSI
7.8
1050
21,100 PSI
Bullet: 200 GR. LRNFP
Dia. .430"
COL: 1.570"
Trail Boss
6.1
890
17,900 PSI
7.7
988
20,700 PSI
Bullet: 240 GR. LWSC
Dia. .430"
COL: 1.620"
Trail Boss
6.0
828
19,100 PSI
7.3
917
21,600 PSI
45 S&W (SCHOFIELD) (PISTOL)
Case: Starline
Twist: 1:16"
Barrel: 5"
Trim: 1.095"
Primer: Winchester LP
Bullet: 200 GR. LRNFP
Dia. .452"
COL: 1.430"
Trail Boss
4.0
684
9,000 CUP
5.0
791
13,200 CUP
Bullet: 230 GR. HDY LRNFP
Dia. .452"
COL: 1.430"
Trail Boss
4.0
649
9,000 CUP
5.0
739
13,000 CUP
Bullet: 250 GR. LRNFP
Dia. .452"
COL: 1.430"
Trail Boss
3.5
537
7,300 CUP
4.8
685
13,200 CUP
45 COLT
Case: Winchester
Twist: 1:16"
Barrel: 7.25"
Trim: 1.280"
Primer: Winchester LP
Bullet: 160 GR. Cast LRNFP
Dia. .452"
COL: 1.480"
Trail Boss
7.0
903
8,100 PSI
8.5
1018
10,800 PSI
Bullet: 180 GR. Cast LRNFP
Dia. .452"
COL: 1.540"
Trail Boss
6.0
818
9,400 PSI
7.3
935
12,700 PSI
Bullet: 200 GR. Cast LRNFP
Dia. .452"
COL: 1.600"
Trail Boss
5.5
706
8,000 PSI
6.5
855
11,000 PSI
Bullet: 215 GR. Cast LRNFP
Dia. .452"
COL: 1.650"
Trail Boss
5.5
725
8,100 PSI
6.5
820
10,300 PSI
Bullet: 230 GR. Cast LRNFP
Dia. .452"
COL: 1.580"
Trail Boss
5.5
685
9,100 PSI
6.5
802
12,400 PSI
Bullet: 250 GR. Cast LRNFP
Dia. .452"
COL: 1.600"
Trail Boss
4.5
606
8,800 PSI
5.8
727
12,700 PSI
454 CASULL
Case: Freedom Arms
Twist: 1:24"
Barrel: 9.375"
Trim: 1.380"
Primer: Winchester SR
Bullet: 250 GR. MEI LRNFP
Dia. .452"
COL: 1.680"
Trail Boss
6.7
862
14,800 CUP
9.0
1011
19,300 CUP
Bullet: 265 GR. CPB LFPGC
Dia. .452"
COL: 1.700"
Trail Boss
7.0
836
18,800 CUP
9.0
984
27,100 CUP
Bullet: 300 GR. CPB LFPGC
Dia. .452"
COL: 1.800"
Trail Boss
6.5
767
14,900 CUP
8.0
865
23,900 CUP
Bullet: 325 GR. CPB LFNPB
Dia. .452"
COL: 1.760"
Trail Boss
5.0
636
13,600 CUP
7.0
798
23,700 CUP
Bullet: 335 GR. CPB LFNGC
Dia. .452"
COL: 1.770"
Trail Boss
4.8
618
15,500 CUP
6.8
778
25,600 CUP
Bullet: 360 GR. CPB LFNGC
Dia. .452"
COL: 1.760"
Trail Boss
5.0
615
18,000 CUP
6.0
699
27,300 CUP
Bullet: 395 GR. CPB LFNGC
Dia. .452"
COL: 1.770"
Trail Boss
4.0
519
19,200 CUP
5.0
607
23,600 CUP
460 S&W MAGNUM
Case: Starline
Twist: 1:20"
Barrel: 10.743 "
Trim: 1.790"
Primer: Winchester LRM
Bullet: 325 GR. CPB LFNPB
Dia. .452"
COL: 2.200"
Trail Boss
7.0
734
16,500 PSI
11.0
914
20,400 PSI
Bullet: 335 GR. CPB WLNGC
Dia. .452"
COL: 2.180"
Trail Boss
7.0
726
17,700 PSI
10.0
887
22,200 PSI
Bullet: 360 GR. CPB WLNGC
Dia. .452"
COL: 2.190"
Trail Boss
7.0
712
19,600 PSI
9.0
827
24,200 PSI
Bullet: 395 GR. CPB WLNGC
Dia. .452"
COL: 2.185"
Trail Boss
7.0
695
21,100 PSI
8.0
754
24,000 PSI
480 RUGER
Case: Hornady
Twist: 1:18"
Barrel: 7.5"
Trim: 1.275"
Primer: Winchester LP
Bullet: 355 GR. BTB LFNGC
Dia. .476"
COL: 1.630"
Trail Boss
5.0
621
16,700 PSI
6.5
740
22,700 PSI
Bullet: 370 GR. CPB LFP
Dia. .475"
COL: 1.640"
Trail Boss
4.5
597
16,000 PSI
5.7
689
20,900 PSI
Bullet: 405 GR. CPB (w/GCK)
Dia. .475"
COL: 1.620"
Trail Boss
3.5
469
15,200 CUP
5.5
645
25,700 CUP
Bullet: 420 GR. BTB LFNGC
Dia. .476"
COL: 1.640"
Trail Boss
3.5
467
16,200 PSI
5.0
597
24,300 PSI
475 LINEBAUGH
Case: Hornady
Twist: 1:20"
Barrel: 8"
Trim: 1.390"
Primer: Winchester LP
Bullet: 370 GR. CPB LFP
Dia. .475"
COL: 1.770"
Trail Boss
6.0
661
16,000 PSI
8.5
824
27,500 PSI
Bullet: 405 GR. CPB LFPGC
Dia. .475"
COL: 1.745"
Trail Boss
5.5
603
19,000 PSI
7.5
732
29,600 PSI
500 LINEBUAGH
Case: Starline
Twist: 1:20"
Barrel: 8"
Trim: 1.400"
Primer: CCI 350
Bullet: 410 GR. LFP
Dia. .511"
COL: 1.800"
Trail Boss
8.5
752
15,400 PSI
10.0
815
17,400 PSI
Bullet: 425 GR. LFP(w/GCK)
Dia. .511"
COL: 1.800"
Trail Boss
7.5
664
13,100 PSI
9.5
768
16,400 PSI
Bullet: 450 GR. MT. BAL LWSC
Dia. .512"
COL: 1.840"
Trail Boss
9.2
759
19,700 PSI
10.0
800
25,000 PSI
Bullet: 468 GR. LFP
Dia. .511"
COL: 1.800"
Trail Boss
7.3
640
14,400 PSI
9.2
730
18,100 PSI
500 WYOMING EXPRESS
Case: Freedom Arms
Twist: 1:20"
Barrel: 9 "
Trim: 1.360"
Primer: Federal 210
Bullet: 350 GR. HDY XTP
Dia. .500"
COL: 1.740"
Trail Boss
7.0
624
20,700 PSI
10.0
831
26,700 PSI
Bullet: 370 GR. CPB LGC
Dia. .500"
COL: 1.740"
Trail Boss
7.0
698
19,100 PSI
10.0
859
23,800 PSI
Bullet: 400 GR. CPB LGC
Dia. .500"
COL: 1.750"
Trail Boss
8.0
738
23,200 PSI
10.0
842
28,000 PSI
Bullet: 440 GR. CPB LGC
Dia. .500"
COL: 1.740"
Trail Boss
6.0
600
20,100 PSI
8.0
717
24,800 PSI
500 S&W MAGNUM
Case: Starline
Twist: 1:18"
Barrel: 10 "
Trim: 1.615"
Primer: Winchester LR
Bullet: 370 GR. CPB LGC
Dia. .500"
COL: 2.020"
Trail Boss
8.0
746
13,500 PSI
12.0
926
19,000 PSI
Bullet: 440 GR. CPB LGC
Dia. .500"
COL: 2.025"
Trail Boss
7.0
643
14,600 PSI
10.0
799
21,200 PSI
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