The question of M855 vs. M193 for a survival situation ("SHTF") is a crucial one for anyone stocking up on 5.56 ammunition. Both cartridges are commonly available, but their performance characteristics differ significantly, impacting their suitability for various scenarios. This deep dive will analyze both rounds, helping you make an informed decision for your preparedness needs.
Understanding the Ballistics: M855 vs. M193
Both M855 and M193 are 5.56x45mm NATO cartridges, but their construction and resulting ballistics vary considerably.
M193: This is the older, full-lead bullet design. It features a lighter projectile (55 grains) and a relatively higher velocity. This leads to flatter trajectory at shorter ranges, making it ideal for precision shooting at targets within 300 yards. However, its lighter construction means it's less effective at penetrating barriers and retaining energy at longer distances.
M855: The M855, also known as SS109, is a more modern design incorporating a steel core. This heavier projectile (62 grains) delivers more significant penetration and retained energy at longer ranges. Its trajectory is slightly less flat at close range compared to M193, but this difference is negligible for most self-defense scenarios. The steel core makes it more effective against hard targets and barriers. However, the steel core can pose a safety concern regarding overpenetration, something to bear in mind when choosing ammunition.
Key Differences Summarized:
| Feature | M193 (55gr) | M855 (62gr) |
|---|---|---|
| Bullet Weight | 55 grains | 62 grains |
| Velocity | Higher | Lower |
| Trajectory | Flatter at shorter ranges | Slightly less flat |
| Penetration | Lower | Higher |
| Barrier Penetration | Lower | Higher (potential overpenetration) |
| Fragmentation | More likely | Less likely |
| Cost | Generally Lower | Generally Higher |
Choosing the Right Ammo for SHTF: Considerations Beyond Ballistics
While the ballistic differences are crucial, several other factors must be considered when choosing between M855 and M193 for SHTF scenarios:
1. Intended Use:
- Close-quarters combat (CQB): M193's flatter trajectory at shorter ranges might offer a slight advantage in tight spaces, though the difference is often negligible.
- Longer-range engagements: M855's superior penetration and retained energy make it a better choice for engagements beyond 300 yards.
- Home defense: The potential for overpenetration with M855 makes it less desirable for home defense, as it poses risks to bystanders. M193, while offering less penetration, represents a better balance between stopping power and safety within confined spaces.
2. Availability and Cost:
M193 is often cheaper and more readily available than M855. Consider both price and availability when stocking up.
3. Your Weapon System:
Some older or less robust firearms may not reliably cycle with M855 due to its higher recoil impulse. Consult your firearm's manual to ensure compatibility.
Conclusion: A Balanced Approach for SHTF Preparedness
The "best" ammunition for SHTF depends entirely on your specific needs and priorities. There is no single, universally correct answer. A balanced approach might involve stocking both M193 (for close-range scenarios and its cost-effectiveness) and M855 (for longer-range engagements or situations requiring more penetration). The crucial factor is to choose ammunition that you can reliably utilize in your specific weapon system, accounting for potential ethical and practical issues pertaining to overpenetration. Remember that regular practice with your chosen ammunition is key to proficiency.
