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Joined: Jul 2015
Posts: 14,647
Campfire Outfitter
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Campfire Outfitter
Joined: Jul 2015
Posts: 14,647 |
Heat values from "BarrelLifeUpdate.xls"
Accurate No.1680 => 4018 Hodgdon Benchmark=> 3900 IMR 3031 => 3880 Vihtavuori 20N29 => 3580
Accurate No.2230 => 3710 Hodgdon BL-C2 => 3990 IMR 4064 => 3880 Vihtavuori 24N41 => 3785
Accurate No.2460 => 3690 Hodgdon H110 => 4110 Hodgdon H322 => 4000 IMR 4198 => 3910 Vihtavuori N120 => 3680
Accurate No.2520 => 3700 Hodgdon H335 => 3980 IMR 4227 => 4040 Vihtavuori N130 => 3770
Accurate No.2700 => 3545 Hodgdon H380 => 3970 IMR 4320 => 3890 Vihtavuori N133 => 3630
Accurate No.8700 => 3460 Hodgdon H414 => 3960 IMR 4350 => 3900 Vihtavuori N135 => 3590
Accurate XMR 2015 => 3754 Hodgdon H4198 => 3860 IMR 4831 => 3720 Vihtavuori N140 => 3720
Accurate XMR 2495 => 3810 Hodgdon H4350 => 3990 IMR 4895 => 3890 Vihtavuori N150 => 3780
Accurate XMR 3100 => 3550 Hodgdon H4831 SC => 3870 IMR 7828 => 3850 Vihtavuori N160 => 3620
Accurate XMR 4064 => 3700 Hodgdon H4895 => 3930 Norma 200 => 3850 Vihtavuori N165 => 3500
Accurate XMR 4350 => 3790 Hodgdon H1000 => 3630 Norma 201 => 3980 Vihtavuori N170 => 3700
Alliant Reloder- 7 => 3910 Hodgdon 50BMG => 4010 Norma 204 => 3950 Vihtavuori N540 => 4100
Alliant Reloder-10x => 4000 Hodgdon H870 => 3810 Norma MRP => 4020 Vihtavuori N550 => 4050
Alliant Reloder-12 => 3830 Hodgdon VARGET => 4040 Winchester 748 => 3840 Vihtavuori N560 => 4020
Alliant Reloder-15 => 3990 Ramshot BigGame => 3920 Winchester 760 => 3880
Alliant Reloder-19 => 3980 Ramshot Enforcer => 4005 WinchesterWXR => 3980
Alliant Reloder-22 => 3990 Ramshot Magnum => 3775 Winchester 296 => 4300
Alliant Reloder-25 => 3810 RamshotTAC => 3950
Alliant AR Comp => 3740 Ramshot X-Terminator => 3950
Politics is War by Other Means
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Joined: Mar 2020
Posts: 139
Campfire Member
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OP
Campfire Member
Joined: Mar 2020
Posts: 139 |
Tyrone, thanks for the Excel spreadsheet and the powder heat values above. In doing some crunching, I've
Powder Powder Gr Barrel Life Bullet WT Velocity
H870 72.5 55K 821 130 3200
H4831SC 68.5 55K 850 95 3550
Magnum 65.8 55K 1044 130 3100
IMR4350 58.2 55K 1133 130 3100
IMR7828 62.2 55K 1059 130 3100
IMR7828 70.4 55K 826 95 3550
H4350 62.5 55K 826 95 3550
RL22 58.1 55K 1015 140 3000
Magnum 64.9 55K 1073 140 3000
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Joined: Mar 2020
Posts: 139
Campfire Member
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OP
Campfire Member
Joined: Mar 2020
Posts: 139 |
Oops, posted the above accidentally while trying to get formatting aligned. Essentially, it seems that it's a balance between heat and powder volume. I ran both fast and slow powders at the same velocities and there seems to be little difference in calculated barrel life. The RL33 remains a mystery as to why it generates so much heat vs say Ramshot Magnum. RL33 is still slower than Magnum, and with 5gr of powder difference it's a huge difference in barrel heat. All I can attribute this to is time - that the RL33 burns so slow that there's more opportunity for heat conduction to occur. RL33 shoots very accurately, but I'm looking for an alternative which can produce the accuracy. I always let the barrel cool and never shoot the gun if it's warm to touch, but according to the Excel document, this doesn't look like it makes much of a difference between powders, and that the 264 is simply doomed. If I find that I've shot out the barrel, then a 1:8 twist will go on. Interesting stuff, thanks everyone!
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Joined: Jul 2015
Posts: 14,647
Campfire Outfitter
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Campfire Outfitter
Joined: Jul 2015
Posts: 14,647 |
Probably has some/more nitroglycerin than RS Magnum.
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