Lapua does not seem to publish a great deal of information about what lot numbers can tell shooters. Nevertheless the numbers are not arbitrary, and can reveal some details that may be of interest. The information below is gleaned from information about Lapua ammo that is said to be confirmed by Lapua officials. If there are errors, corrections are welcome.
Lapua lot numbers have five digits, a slash, and six more digits.
These numbers can tell us the average muzzle velocity (MV) of the ammo. This is the average in Lapua's test rifles, which have 660mm (26") barrels. The actual MV in any particular rifle may well be different. They also tell us the year the ammo was loaded and on which machine it was made. If the label from the case of ammo is available, it will tell you how many cases of that particular lot number were made.
The first two digits tell us the average MV of the ammo in the lot. Put a 3 in front of the first two digits, in this case a 3 in front of 28 to get 328 meters per second. To get m/s to fps, multiply the m/s figure by 3.28. Remember that this is the average MV in Lapua's test rifles. Individual rounds will be different and the average MV in your particular rifle could also be different.
The third digit, a 5, apparently tells us that it is a bullet used for Center X, Midas +, or X-Act.
The fourth and fifth digits tell us the year the ammo was made. In this case, a 5 and 1 are added to give 6 for 2016.
The first number following the slash (/) tells us what machine made the ammo. Apparently Lapua now has three machines, numbered 5, 6, and 7.
The final five digits are the identifying lot number.
On the information on the label on the case box, shown in the image above, tells us how many cases were made and which one of those this case represents. In this case there were 3 cases of this lot of ammo, and this was the first case of three (13 = 1 of 3).
If anyone has corrections please post them.
Lapua lot numbers have five digits, a slash, and six more digits.
These numbers can tell us the average muzzle velocity (MV) of the ammo. This is the average in Lapua's test rifles, which have 660mm (26") barrels. The actual MV in any particular rifle may well be different. They also tell us the year the ammo was loaded and on which machine it was made. If the label from the case of ammo is available, it will tell you how many cases of that particular lot number were made.
The first two digits tell us the average MV of the ammo in the lot. Put a 3 in front of the first two digits, in this case a 3 in front of 28 to get 328 meters per second. To get m/s to fps, multiply the m/s figure by 3.28. Remember that this is the average MV in Lapua's test rifles. Individual rounds will be different and the average MV in your particular rifle could also be different.
The third digit, a 5, apparently tells us that it is a bullet used for Center X, Midas +, or X-Act.
The fourth and fifth digits tell us the year the ammo was made. In this case, a 5 and 1 are added to give 6 for 2016.
The first number following the slash (/) tells us what machine made the ammo. Apparently Lapua now has three machines, numbered 5, 6, and 7.
The final five digits are the identifying lot number.
On the information on the label on the case box, shown in the image above, tells us how many cases were made and which one of those this case represents. In this case there were 3 cases of this lot of ammo, and this was the first case of three (13 = 1 of 3).
If anyone has corrections please post them.
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