Do you have a list of burn temperatures for powders that you could share with me please?
http://www.leroyrifleandpistolclub.org/powder-heat-potential.html
MakeProductPotential
1.)VihtavuoriN530 4100 kJ/kg
2.)VihtavuoriN540 4100 kJ/kg
3.)IMR4895 4080 kJ/kg
4.)HodgdonH4895 4060 kJ/kg
5.)HodgdonVARGET 4050 kJ/kg
7.)VihtavuoriN550 4050 kJ/kg
10.)IMR4227 4040 kJ/kg
11.)VihtavuoriN560 4020 kJ/kg
12.)AccurateAccurate 1680 4018 kJ/kg
13.)NormaURP 4017 kJ/kg
14.)Hodgdon50BMG 4010 kJ/kg
15.)RamshotEnforcer 4005 kJ/kg
16.)AlliantReloder-10x 4000 kJ/kg
17.)HodgdonH322 4000 kJ/kg
18.)VihtavuoriN110 4000 kJ/kg
19.)AlliantReloder-15 3990 kJ/kg
20.)AlliantReloder-17 3990 kJ/kg
21.)AlliantReloder-22 3990 kJ/kg
22.)HodgdonBL-C2 3990 kJ/kg
23.)AlliantReloder-19 3980 kJ/kg
24.)HodgdonH335 3980 kJ/kg
25.)WinchesterWXR 3980 kJ/kg
26.)HodgdonH380 3970 kJ/kg
27.)Norma203B 3957 kJ/kg
28.)RamshotX-Terminator 3950 kJ/kg
29.)RamshotTAC 3950 kJ/kg
30.)Norma200 3940 kJ/kg
31.)IMR4007 SSC 3935 kJ/kg
32.)IMR8208 XBR 3920 kJ/kg
33.)RamshotBigGame 3920 kJ/kg
34.)AlliantReloder-7 3910 kJ/kg
35.)IMR4198 3910 kJ/kg
36.)RamshotHunter 3910 kJ/kg
37.)HodgdonBenchmark 3900 kJ/kg
38.)Norma203 (old) 3900 kJ/kg
39.)Norma201 3894 kJ/kg
40.)IMR4320 3890 kJ/kg
41.)AccurateMagpro 3880 kJ/kg
42.)HodgdonH414 3880 kJ/kg
43.)IMR3031 3880 kJ/kg
44.)IMR4064 3880 kJ/kg
45.)Winchester760 3880 kJ/kg
46.)NormaMRP 3873 kJ/kg
47.)HodgdonH4831SC 3870 kJ/kg
48.)HodgdonH4831 3870 kJ/kg
49.)HodgdonH4198 3860 kJ/kg
50.)Norma202 3852 kJ/kg
51.)Norma204 3852 kJ/kg
52.)IMR7828 3850 kJ/kg
53.)IMR7828 SSC 3850 kJ/kg
54.)VihtavuoriN130 3850 kJ/kg
55.)Winchester748 3840 kJ/kg
56.)AlliantReloder-12 3830 kJ/kg
57.)AlliantReloader-50 3820 kJ/kg
58.)AccurateAccurate 2495 3810 kJ/kg
59.)AccurateXMR 3810 kJ/kg
60.)AlliantReloder-25 3810 kJ/kg
61.)HodgdonH870 3810 kJ/kg
62.)AccurateAccurate 4350 3790 kJ/kg
63.)Vihtavuori24N41 3785 kJ/kg
64.)RamshotMagnum 3775 kJ/kg
65.)Norma217 3766 kJ/kg
66.)HodgdonH4350 3760 kJ/kg
67.)IMR43503760 kJ/kg
68.)AccurateAccurate 2015 3754 kJ/kg
69.)VihtavuoriN140 3750 kJ/kg
70.)VihtavuoriN150 3750 kJ/kg
71.)WinchesterSupreme 780 3750 kJ/kg
72.)IMR4831 3720 kJ/kg
73.)AccurateAccurate 2230 3710 kJ/kg
74.)HodgdonRetumbo 3710 kJ/kg
75.)HodgdonUS 869 3700 kJ/kg
76.)VihtavuoriN170 3700 kJ/kg
77.)AccurateAccurate 2460 3690 kJ/kg
78.)VihtavuoriN120 3650 kJ/kg
79.)VihtavuoriN133 3650 kJ/kg
80.)VihtavuoriN160 3650 kJ/kg
81.)HodgdonH1000 3630 kJ/kg
82.)VihtavuoriN165 3600 kJ/kg
83.)Vihtavuori20N29 3580 kJ/kg
84.)AccurateAccurate 3100 3550 kJ/kg
85.)AccurateAccurate 3100 3550 kJ/kg
86.)VihtavuoriN135 3550 kJ/kg
87.)AccurateAccurate 2700 3545 kJ/kg
88.)HodgdonHybrid 100V 3545 kJ/kg
Might explain why people are seeing much variance from barrel to barrel depending on the powder they choose to campaign. Varget and H4895 are right there at the very top. Maybe it is not the cartridge as much as it is the high energy powders everyone is using in these little cases trying to get velocities. They might actually be better off with a bit bigger case with a cooler powder.