Quick Answer
The 6x47 Lapua and 6mm Creedmoor are both popular choices in Precision Rifle Series (PRS) competitions, but the 6x47 Lapua offers slightly better performance in long-range engagements due to its more efficient powder burn and reduced wind deflection.
Ballistic Comparison
When comparing the two cartridges, the 6x47 Lapua has a slightly longer case length (2.235 inches) compared to the 6mm Creedmoor (2.015 inches). This results in a more efficient powder burn, giving the 6x47 Lapua a slight edge in long-range accuracy. For instance, a .5 MOA group at 1000 yards requires a bullet with a BC of 0.55 or higher. The 6x47 Lapua can achieve this with a 105-grain bullet, while the 6mm Creedmoor typically requires a 108-grain bullet.
Performance in Windy Conditions
In windy conditions, the 6x47 Lapua’s bullet has a slightly lower wind deflection due to its more aerodynamic shape and higher BC. This makes it a better choice for long-range engagements, especially in environments with strong crosswinds. For example, a 10 mph crosswind at 1000 yards requires a bullet with a BC of at least 0.55 to maintain a 5 MOA group size. The 6x47 Lapua’s 105-grain bullet meets this requirement, while the 6mm Creedmoor’s 108-grain bullet may start to show signs of wind deflection.
Practical Considerations
In practical terms, the 6x47 Lapua and 6mm Creedmoor both have similar recoil profiles and require similar chamber pressures. However, the 6x47 Lapua’s longer case length requires a slightly more generous chamber design to accommodate the longer case. This may require a custom chamber job, but the benefits in accuracy and long-range performance make it worth the additional expense.
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