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Lazzeroni Caliber 6.53 (.257) Scramjet

 

  
A T T E N T I O N
  
Please do not be one of those hand loaders who is going to search through this information just to find the stated "MAXIMUM" load and start with that.
  
There is much more to determining your maximum load than just how much powder you can dump in the case.
  
Temperature, bullet type, bullet weight, bullet seating depth, barrel twist, grove diameter, chamber throat profile. These are just a few of the variables that can affect velocity and pressure.
  
In our never-ending search for high velocity, anyone can overload a cartridge to achieve "BRAGGING RIGHTS".
  
In doing so however, you risk damaging your rifle, endangering yourself and those around you.
  
The following information will assist you in working up an accurate, high velocity load for your rifle in a safe and prudent manner.
  
A good set of reloading dies, a quality set of calipers, an accurate powder scale and a reliable chronograph are some of the items you will need.
  
Begin by firing the first shot with the starting load and record seating depth and velocity.
  
Increase the powder charge no more than 1 grain at a time. If you experience ANY ONE of the following signs of pressure, reduce your powder charge by 10% and consider that your maximum load. Never exceed the maximum load stated in the following chart regardless of whether or not any pressure signs are apparent.

1. If you begin to see pressure signs on the primer such as flattening or "cratering" around the firing pin dent.
2. If enough brass flows into the ejector pin hole on the bolt face so as to cause a shiny spot or dent when the cartridge is ejected.
3. When ejecting the fired cartridge, the bolt is sticky or hard to lift.
  
  
Test Components
  
  Maximum Case Length 2.810"
  Trim-To Length 2.790"
  Primer Used FED 215
  Primer Size Large Rifle, Magnum
  RCBS Shell Holder #4
  Jacketed Bullets Used Nosler Ballistic Tip 85GR
 Nosler Partition 100GR
Nosler Partition 115GR
  
Test Specifications (Velocity and Pressure)
  
  Firearm Used: Pressure Test Rifle
  Barrel Length: 27"
  Twist: 12"
  Groove Diameter: .257"
 
   
85 Grain Nosler Ballistic Tip 3.470 O.A.L. @ 70F
POWDER
TYPE
SUGGESTED
STARTING GRAINS
ABSOLUTE MAXIMUM
LOAD IN GRAINS
VELOCITY
IN F.P.S.
PRESSURE
IN C.U.P.
Alliant
Reloader 19
71GR 76GR 3952 55,700
DuPont
IMR 7828
75GR 80GR 3973 55,600

  

100 Grain Nosler Partition 3.470 O.A.L. @ 70F
POWDER
TYPE
SUGGESTED
STARTING GRAINS
ABSOLUTE MAXIMUM
LOAD IN GRAINS
VELOCITY
IN F.P.S.
PRESSURE
IN C.U.P.
Alliant
Reloader 19
68GR 73GR 3707 55,800
DuPont
IMR 7828
72GR 77GR 3734 55,200
Accurate
8700
87GR 92GR 3754 54,500

  

115 Grain Nosler Partition 3.470 O.A.L. @ 70F
POWDER
TYPE
SUGGESTED
STARTING GRAINS
ABSOLUTE MAXIMUM
LOAD IN GRAINS
VELOCITY
IN F.P.S.
PRESSURE
IN C.U.P.
Dupont
IMR 7828
69GR 74GR 3501 56,600
Accurate
8700
84GR 89GR 3546 54,100

  

Some of you may wonder why the velocities stated in these handloading specifications are not comparable or as high as those advertised by Lazzeroni Arms Company for our factory loaded ammunition. 

Your rifle may have a different barrel length, groove diameter or twist rate than used for the rifles manufactured by Lazzeroni Arms Company.

Under no circumstances should you exceed the maximum powder charges stated in these specifications.

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