The M24 Sniper Weapon System, historically celebrated for its robust design and sub-MOA capability with purpose-built match ammunition, offers an insightful look into precision rifle performance under varying ammunition conditions. While competitive shooters in the Precision Rifle Series (PRS) and National Rifle League (NRL) meticulously develop handloads or rely on high-quality factory match cartridges, understanding a precision rifle's baseline accuracy with common full metal jacket (FMJ) rounds provides a valuable perspective on platform versatility, even if outside typical match scenarios.
A recent examination focused on a used M24 rifle, equipped with a fixed 10X optic, to assess its accuracy with M80 Winchester 147 grain FMJ ammunition. This ammunition is recognized as a standard US Military ball cartridge, typically encountered in belt-fed weapon systems. For context, the rifle's established precision with match ammunition served as a benchmark. When paired with Federal Gold Medal 175 Grain SMK ammunition, the M24 consistently delivered groups well under 1 MOA at 100 yards. Utilizing optimized handloads, the rifle further tightened groups to approximately 0.5 MOA, reaffirming its inherent accuracy potential under ideal conditions.
However, the results observed with the M80 ball ammunition presented a stark contrast. A test involving ten rounds fired at 100 yards from the M24 yielded an average group size of 2.572 MOA. The observed muzzle velocity for this ammunition averaged 2,803 feet per second, with a standard deviation (SD) of 17.8. This significant degradation in precision, while perhaps anticipated given the non-match nature of the ammunition, was noted to be quite severe when compared directly to the rifle's match-grade performance. It was also noted that the measured velocity was remarkably consistent with military specifications, differing by only three feet per second.
For the precision rifle competitor, a 2.5 MOA grouping at 100 yards represents a substantial challenge, particularly at extended ranges where external ballistics amplify even minor inaccuracies. This level of precision, while potentially adequate for engagement at closer ranges where target size is generous, quickly becomes a significant handicap when attempting to engage standard PRS or NRL steel targets at distances exceeding 300 yards. A target presenting a 2 MOA wide plate, for instance, would be at the extreme edge of theoretical hit probability with 2.5 MOA ammunition, demanding exceptionally precise wind calls and perfect technique to compensate for the inherent dispersion. In contrast, the sub-MOA performance of match ammunition provides a much larger margin for error, a critical factor when managing the inherent complexities of long-range engagement.
Further analysis through ballistic simulations illustrated the M80’s performance characteristics relative to more common match projectiles, specifically the 168-grain and 175-grain SMKs. While the lighter 147-grain M80 projectile, propelled at its higher 2,803 ft/s velocity, showed a surprisingly similar drop trajectory out to 1,000 yards compared to the heavier match rounds (operating at 2600 ft/s and 2756 ft/s, respectively), its performance in crosswinds was notably inferior. This is a critical distinction for competitors, as wind holds constitute a significant component of stage planning and execution in PRS and NRL matches. The inherent limitations of the M80's ballistic coefficient become particularly apparent when confronting even moderate wind conditions.
The takeaway for serious long-range enthusiasts and competitors is clear: while a precision rifle system like the M24 retains some functional capability with standard ball ammunition in extreme circumstances, its true potential for accuracy is unlocked only through the use of high-quality, consistent match-grade projectiles and carefully developed loads. The substantial difference between 0.5-1 MOA and 2.572 MOA underscores the non-negotiable role of ammunition quality in achieving the precision demanded by competitive shooting sports.
