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Re: Barrel life and powder burn rate [Re: Mkopmani] #15103132 08/02/20
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Tyrone Offline
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Heat values from "BarrelLifeUpdate.xls"

Code
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


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Re: Barrel life and powder burn rate [Re: Mkopmani] #15108232 08/04/20
Joined: Mar 2020
Posts: 31
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Mkopmani Offline OP
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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

Re: Barrel life and powder burn rate [Re: Mkopmani] #15108262 08/04/20
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Mkopmani Offline OP
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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!

Re: Barrel life and powder burn rate [Re: Mkopmani] #15111346 08/05/20
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Tyrone Offline
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Probably has some/more nitroglycerin than RS Magnum.


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