Hornady announced the 7mm A-tip, does that mean the 7PRC will be at SHOT?
- Thread starter WahooYahoo
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jpndave
Well-Known Member
190gr A-Tip BCs are listed.
.838 (G1)
.422 (G7)
for reference 180gr is
.796 (G1)
.401 (G7)
.838 (G1)
.422 (G7)
for reference 180gr is
.796 (G1)
.401 (G7)
jpndave
Well-Known Member
Creedmoor shooter
Well-Known Member
The 180 eld-m g7 is realistically around .360. That's what I and lots of others have come up with. The 190 wouldnt suprise me if it landed more around .380-.400. Will be interesting to find out
jpndave
Well-Known Member
I'd be interested to see how that data compares. Hornady does list some more extended information on this page. The lower speed, slower twist tracks pretty close with what you quoted. I don't know how they decided on the main page published data.
Steve of Hammer bullets mentioned that they are seeing similar things with twist sensitivity and higher BC with their bullets spinning faster twists.
www.hornady.com
Steve of Hammer bullets mentioned that they are seeing similar things with twist sensitivity and higher BC with their bullets spinning faster twists.
Ballistic Coefficient - Hornady Manufacturing, Inc
A-Tip®, ELD® Match, and ELD-X® Ballistic Coefficient Values Hornady originally published “800 yard”* average Ballistic Coefficient (BC) values for ELD-X and ELD Match bullets. This was done to provide the most usable BC from a trajectory prediction st...
| BULLET | Mach 2.25 (2512 fps* and above) | Mach 2.0 (2232 fps*) | Mach 1.75 (1953 fps*) |
| 7mm 180 gr. ELD Match 1 in 8.75" Twist | 0.777 G1 0.391 G7 | 0.748 G1 0.376 G7 | 0.731 G1 0.368 G7 |
| 7mm 180 gr. ELD Match 1 in 7.5" Twist | 0.816 G1 0.411 G7 | 0.812 G1 0.408 G7 | 0.782 G1 0.394 G7 |
You can't really base BC on yardage, needs to be velocity based. Hornady does list several different BC's for different velocities.
I guess I was thinking about the velocity average over a certain distance that would figure in. I understand what you are saying though. Velocity average at a distance of say 200yds would be far greater than that of 1000yds. I know that figuring b.c. for 200 yards really doesn't have much practical use for what we are talking about, it was just an example.
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WiscGunner
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The reason yardage is unimportant and velocity is uses if the velocity is a factor of calculating BC and yardage is only a factor of the cartridge not the bullet.
Example: a 7Dasher will not have the same velocity at 200 yards a 7/50BMG. A 7saum loaded with trailboss will have a different BC than a 7saum loaded with Unicorn Dust. Therefore cartridge or yardage are irrelevant and velocity is the important factor to keep in mind.
Ballistic Coefficient - Hornady Manufacturing, Inc
A-Tip®, ELD® Match, and ELD-X® Ballistic Coefficient Values Hornady originally published “800 yard”* average Ballistic Coefficient (BC) values for ELD-X and ELD Match bullets. This was done to provide the most usable BC from a trajectory prediction st...
Correct, I agree velocity is the most important factor. Velocity will be inversly proportial to yardage as the bullet travels down range.
Farmerbrown32
Well-Known Member
Anymore news on these? Just got a box to try in the 28 nosler
