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Your barrel will collect pieces of the metal that your projectiles are made out of. We have found it advantageous to start shooting G9 projectiles with a clean, non-fouled, bore. An increase in velocity has been observed when the barrel is broken in with G9 projectiles. We have witnessed this taking place in as little as seven shots and as many as forty-four. Each barrel seems to be slightly different. Typically, the velocities will level out by the time that load development is done. We have not found these projectiles to foul the bore any faster than a copper-jacketed bullet. One reason for this is the greatly reduced bearing surface. The reduced surface lowers friction and that results in lower barrel temperatures during shooting.
Things to consider…
These projectiles were developed around Accuracy International rifles. They are designed to be optimized for the magazine lengths found in these rifles. Some of the loads listed are greater in length than SAAMI specs allow. We have tested these projectiles in other rifles but the intent of this manual is geared to Accuracy International rifles and chassis. When adapting these loads to a rifle of different make, please give special consideration to the ways rifles vary. Generally, these projectiles are long, and therefore you must have an adequate twist rate to stabilize the projectile. Temperature and altitude will play a role in this equation.
When you load these projectiles…
We have found it advantageous to increase the neck tension when loading G9 projectiles. The reason for this is a combination of the reduction in bearing surface on the projectile and the lubricity of the material. We have found 0.004” of interference to be adequate. The easiest way to achieve this is with a reduction in size of the bushing in your sizing die. All rifles, particularly of different makes, vary. The way the rifles vary may be significant to the amount of pressure that is produced by your ammunition. Know your rifle. Understand the relationship between the magazine length, case overall length and the amount of jump in the barrel. These bullets tend to create more freebore than other makes. This is due to the long ogives of the projectiles. It is recommended that you measure and understand the amount of freebore in the ammunition you load because this will have a direct effect on pressure.
A suggestion on load development…
One strategy for load development is: starting with your beginning charge, load five cartridges with this charge at the same case overall length (COL). Continue this process increasing the charge by 0.3 to 0.5 grains and leaving the COL the same. While shooting these, look for pressure signs, velocity and group size. There are many good manuals that explain pressure signs and anyone that will attempt loading ammunition must be familiar with these. Typically, the group size will tighten up and the standard deviation in muzzle velocity will decrease at a particular charge weight. When the most accurate charge is determined, you may want to move the COL and re-shoot for group size. When the most accurate COL is determined, return to varying the charge weight by 0.2 grains. This is only one method for creating accuracy in your loads. Whatever method is used, ensure that it is a safe one. COL and charge weight will both have a direct effect on pressures. Pressures can change rapidly with small differences in ammunition. Changing components can effect pressures. The thickness of the case has a direct effect on pressure. We have witnessed large changes in powders from lot to lot. Different makes of primers have also had effects on pressure. Please take all of these things into consideration when determining a safe load for your rifle.
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The information and data provided on this website are provided for informational purposes only. Loading ammunition is inherently dangerous and not all firearms are the same. This means that if ammunition is safe to be fired in one firearm, it may still exceed safe pressures in a different firearm. Each individual handloader must determine what the best and safest load for their equipment is. The handloader is cautioned to read and follow safe reloading practices such as those outlined in the NRA Guide to Reloading before attempting to reload any cartridge.
The information provided on this website includes data for ammunition loaded greater than S.A.A.M.I. (Sporting Arms and Ammunition Manufacturers’ Institute) case overall length.
The load data was designed to function safely in Accuracy International rifles. Different rifles may produce different results.
As G9 Bullets, LLC, and its Affiliates, have no control over the actual reloading procedures and methods being used, or the condition or choice of firearms or components used, no responsibility for the use of this data is implied or assumed.
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