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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