CaliberAtlas › 6mm Dasher
Also known as: 6 Dasher
Common uses: Competition, Long Range
| Type | rifle (centerfire) |
| Typical load | 105gr Berger Hybrid Target (BTHP, match) |
| Muzzle velocity | 2850 fps |
| Muzzle energy | 1893 ft-lb |
| G1 ballistic coefficient | 0.536 |
| Case length | 39.24 mm |
| Overall length | 60 mm |
| Common twist rate | 1:8" |
| Range (yd) | Velocity (fps) | Energy (ft-lb) | Drop (in) |
|---|---|---|---|
| 0 | 2850 | 1893 | -1.5 |
| 100 | 2676 | 1669 | 0 |
| 200 | 2509 | 1468 | -3.4 |
| 300 | 2348 | 1285 | -12.3 |
| 400 | 2195 | 1123 | -27.5 |
| 500 | 2047 | 977 | -49.9 |
At 1,000 yards, 6mm Dasher (105gr at 2850 fps, 100 yd zero, standard conditions) has a modeled come-up of about 30.3 MOA / 8.8 MIL, retaining 1388 fps (supersonic).
| Range (yd) | Velocity (fps) | State | Drop (in) | Elev (MOA) | Elev (MIL) |
|---|---|---|---|---|---|
| 300 | 2348 | Supersonic | -12.3 | 3.9 | 1.14 |
| 400 | 2195 | Supersonic | -27.5 | 6.6 | 1.91 |
| 500 | 2047 | Supersonic | -49.9 | 9.5 | 2.77 |
| 600 | 1905 | Supersonic | -80.7 | 12.8 | 3.74 |
| 700 | 1768 | Supersonic | -121.1 | 16.5 | 4.80 |
| 800 | 1636 | Supersonic | -172.4 | 20.6 | 5.99 |
| 900 | 1509 | Supersonic | -236.9 | 25.1 | 7.31 |
| 1000 | 1388 | Supersonic | -316.8 | 30.3 | 8.80 |
Extended predictions beyond 500 yards are modeled from the same G1 engine — useful for initial DOPE, but outside the 500-yard manufacturer-table validation audit. Confirm with observed DOPE, especially near transonic.
A retained-energy reference only — not a shoot/don't-shoot distance. Real effective range depends on your accuracy, shot placement, bullet construction, and conditions. The ~1,000 ft-lb (deer-sized) and ~1,500 ft-lb (elk-sized) figures are commonly cited rules of thumb, not standards.
Your barrel, ammunition lot, and conditions will differ — always verify against the manufacturer's data and your own rifle.
The Dasher is a target cartridge through and through: a long-time benchrest and F-Class standout that became one of the dominant Precision Rifle Series (PRS) cartridges, prized for pushing 105-grain match bullets around 2,850–3,000 fps on small charges of Varget-class powder with mild recoil and excellent barrel life. Factory Eagle Eye match ammunition drives a 105-grain Berger Hybrid at 2,850 fps. It is not a mainstream hunting round — brass prep and magazine feeding take more attention than a factory cartridge — but for shooters chasing small groups and wind-beating efficiency at 600–1,000 yards it remains a benchmark.
The 6mm Dasher began life around 1999 as a wildcat, commonly credited to gunsmith Dan Dowling and Al Ashton — "Dasher" blends "Dan" and "Ashton." It is the 6mm BR Norma improved: the shoulder blown forward roughly a tenth of an inch to a sharp 40-degree angle, picking up about ten percent more powder capacity while keeping the BR's famously accurate, efficient case. For years shooters fire-formed 6BR brass to make Dashers; today Peterson and Alpha Munitions sell properly headstamped 6mm Dasher brass, Eagle Eye loads factory match ammunition, and in 2023 the cartridge was documented in an official C.I.P. datasheet — an unusually mainstream fate for a benchrest wildcat.
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