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#12200669 - 08/11/17 quickload 7,21firebird  
Joined: May 2005
Posts: 28
mikael Offline
Member
mikael  Offline
Member

Joined: May 2005
Posts: 28
Hi i need some help with quickload for 7.21 firebird (lazzeroni) powder vvn570 and noma 217 bullet 175 accubond Lr bullet .284,175 accubond longrange. cartridge o,a,l 3,600 inch barrel length 28 inch case capasy useful 112gr

CMG 300 BP
#12202904 - 08/12/17 Re: quickload 7,21firebird [Re: mikael]  
Joined: Jun 2009
Posts: 1,390
Azar Offline
Campfire Regular
Azar  Offline
Campfire Regular

Joined: Jun 2009
Posts: 1,390
Utah
USE THIS DATA AT YOUR OWN RISK.

Code
Cartridge          : 7.21 Firebird (Lazzeroni)
Bullet             : .284, 175, Nosler Accubond LR 58517 G7
Useable Case Capaci: 101.272 grain H2O = 6.575 cm³
Cartridge O.A.L. L6: 3.600 inch = 91.44 mm
Barrel Length      : 28.0 inch = 711.2 mm
Powder             : Vihtavuori N570

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.434% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-04.3   90    88.20   3124    3793   56359  15080     99.7    1.468
-03.9   90    88.60   3138    3828   57181  15121     99.7    1.458  ! Near Maximum !
-03.5   90    89.00   3153    3862   58015  15161     99.8    1.448  ! Near Maximum !
-03.0   91    89.40   3167    3897   58861  15198     99.8    1.438  ! Near Maximum !
-02.6   91    89.80   3181    3932   59718  15235     99.9    1.429  ! Near Maximum !
-02.2   92    90.20   3195    3967   60588  15269     99.9    1.419  ! Near Maximum !
-01.7   92    90.60   3209    4002   61469  15302     99.9    1.410  ! Near Maximum !
-01.3   92    91.00   3223    4037   62363  15334    100.0    1.400  ! Near Maximum !
-00.9   93    91.40   3237    4072   63270  15363    100.0    1.391  ! Near Maximum !
-00.4   93    91.80   3251    4107   64190  15391    100.0    1.381  ! Near Maximum !
+00.0   94    92.20   3265    4142   65122  15417    100.0    1.372  ! Near Maximum !
+00.4   94    92.60   3279    4177   66068  15442    100.0    1.363  !DANGEROUS LOAD-DO NOT USE!
+00.9   94    93.00   3293    4213   67027  15467    100.0    1.354  !DANGEROUS LOAD-DO NOT USE!
+01.3   95    93.40   3306    4248   68000  15492    100.0    1.345  !DANGEROUS LOAD-DO NOT USE!
+01.7   95    93.80   3320    4283   68987  15516    100.0    1.336  !DANGEROUS LOAD-DO NOT USE!
+02.2   96    94.20   3334    4319   69988  15541    100.0    1.327  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba     94    92.20   3342    4340   72042  15091    100.0    1.312  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba     94    92.20   3170    3904   58252  15633     99.2    1.442  ! Near Maximum !


“There are three things all wise men fear: the sea in storm, a night with no moon, and the anger of a gentle man.”
― Patrick Rothfuss, The Wise Man's Fear
#12204091 - 08/12/17 Re: quickload 7,21firebird [Re: Azar]  
Joined: May 2005
Posts: 28
mikael Offline
Member
mikael  Offline
Member

Joined: May 2005
Posts: 28
Thanks

Mikael

#12205436 - 08/13/17 Re: quickload 7,21firebird [Re: mikael]  
Joined: Jun 2009
Posts: 1,390
Azar Offline
Campfire Regular
Azar  Offline
Campfire Regular

Joined: Jun 2009
Posts: 1,390
Utah
I just realized you asked for two powders. Heres the numbers for Norma 217.

USE THIS DATA AT YOUR OWN RISK.

Code
Cartridge          : 7.21 Firebird (Lazzeroni)
Bullet             : .284, 175, Nosler Accubond LR 58517
Useable Case Capaci: 101.272 grain H2O = 6.575 cm³
Cartridge O.A.L. L6: 3.600 inch = 91.44 mm
Barrel Length      : 28.0 inch = 711.2 mm
Powder             : Norma 217

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.33% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-03.3   96    88.00   3098    3729   58713  13385    100.0    1.463  ! Near Maximum !
-03.0   96    88.30   3107    3752   59360  13406    100.0    1.455  ! Near Maximum !
-02.6   96    88.60   3117    3774   60014  13427    100.0    1.448  ! Near Maximum !
-02.3   97    88.90   3126    3797   60675  13447    100.0    1.441  ! Near Maximum !
-02.0   97    89.20   3135    3820   61342  13468    100.0    1.433  ! Near Maximum !
-01.6   97    89.50   3145    3843   62017  13488    100.0    1.426  ! Near Maximum !
-01.3   98    89.80   3154    3865   62699  13509    100.0    1.419  ! Near Maximum !
-01.0   98    90.10   3163    3888   63387  13529    100.0    1.412  ! Near Maximum !
-00.7   98    90.40   3172    3911   64083  13549    100.0    1.405  ! Near Maximum !
-00.3   99    90.70   3182    3934   64786  13569    100.0    1.398  ! Near Maximum !
+00.0   99    91.00   3191    3957   65497  13589    100.0    1.391  ! Near Maximum !
+00.3   99    91.30   3200    3980   66215  13608    100.0    1.384  !DANGEROUS LOAD-DO NOT USE!
+00.7  100    91.60   3209    4003   66940  13628    100.0    1.377  !DANGEROUS LOAD-DO NOT USE!
+01.0  100    91.90   3219    4026   67674  13647    100.0    1.370  !DANGEROUS LOAD-DO NOT USE!
+01.3  100    92.20   3228    4049   68414  13667    100.0    1.363  !DANGEROUS LOAD-DO NOT USE!
+01.6  101    92.50   3237    4072   69163  13686    100.0    1.357  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba     99    91.00   3250    4104   72574  13351    100.0    1.331  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba     99    91.00   3118    3779   58394  13876    100.0    1.462  ! Near Maximum !


“There are three things all wise men fear: the sea in storm, a night with no moon, and the anger of a gentle man.”
― Patrick Rothfuss, The Wise Man's Fear

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