After much internet searching I ran into this page of official trailboss load data from IMRs website.
http://www.imrpowder.com/data/handgun/trailboss.php

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

I have tried the .357 mag 158grn bullet load with 4.2grns of trail boss and it seems to be much more accurate than my 800x 38spl load.