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Discussion Starter · #1 ·
I got some of the .458" 300gr TTSX from Barnes play with in the 45-70, they have quite a bit different profile than the TSX-FB and are a boattail, I asked Barned by email what the BC is, but haven't got an answer yet. :-\

Tim
 

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Discussion Starter · #4 ·
I found some more info on this bullet, it's disguised as the TAC-TX, BC is .236, not a great deal better than the TSX-FB.

Tim

http://www.barnesbullets.com/blog/2009/03/04/458-socom-tipped-tsx-internet-buy-limited-time/

458 SOCOM NEW Barnes TAC-TX™ Offer – Order by March 31st!

Note: Barnes encourages posting this notice on websites and internet forums.

PRODUCT: 458 SOCOM 300-grain TAC-TX™

TEST WEAPON: Rock River Arms LAR-458

APPLICATION: Law Enforcement, Military (MOUT/CQB/VBSS), Personal Defense and Hunting

BULLET DESCRIPTION: All-Copper, Tipped, Grooved, Boattail

The 458 SOCOM 300-grain TAC-TX™ was designed with the following applications and features:

› Reliable expansion at typical 458 SOCOM velocities across the widest practical engagement ranges.

› Rapid expansion for engagement of soft targets or thin-skinned game, reduced risk of over-penetration

› All-copper “X cavity” design remains intact for consistent, enhanced performance

› Optimized ballistic design for higher accuracy potential. Less drop and wind drift means greater hit probability

› Tipped “spitzer” bullet design allows for significantly more reliable feeding through semi-automatic platforms such as the AR-15 series of firearms

› Ideal for CQB and VBSS applications in military, law enforcement and urban environments

Perfect for rural LE, wildlife control, and hunting anything from small whitetails to black bear[/color]
 

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Discussion Starter · #6 ·
Since it's made for the 458 SOCOM with a muzzle velocity of 1900fps, it should be devastating on a chuck, I'm thinking on sectioning one to see how deep the cavity is, if it's too deep, it may not work at higher velocities on big game, I was hoping for a higher BC for flatter shooting at 300yds.

Tim

Trajectory for Custom .458 Barnes TTSX 300gr at 2400 Feet per Second
At an Elevation Angle of: 0 degrees
Ballistic Coefficients of: 0.236 0.236 0.236 0.236 0.236
Velocity Boundaries (Feet per Second) of: 2400 2400 2400 2400
Wind Direction is: 0.0 o'clock and a Wind Velocity of: 0.0 Miles per hour
Wind Components are (Miles per Hour): DownRange: 0.0 Cross Range: 0.0 Vertical: 0.0
Altitude: 0 Feet with a Standard Atmospheric Model.
Temperature: 59 F
Data Printed in English Units
Range Velocity Energy Momentum Drop Bullet Path Wind Drift Time of Flight
(Yards) (Ft/Sec) (Ft/Lbs) (Lb-Sec) (inches) (inches) (inches) (Seconds)
0 2400.0 3836.3 3.20 0.0 -1.7 0.0 0.000000000
25 2311.0 3557.1 3.08 -0.19 0.2 0.0 0.031846126
50 2223.9 3294.0 2.96 -0.79 1.68 0.0 0.064928977
75 2138.6 3046.1 2.85 -1.83 2.73 0.0 0.099319759
100 2055.2 2813.1 2.74 -3.35 3.31 0.0 0.135094644
125 1973.7 2594.5 2.63 -5.38 3.37 0.0 0.172334204
150 1894.2 2389.7 2.52 -7.96 2.87 0.0 0.211123848
175 1816.8 2198.4 2.42 -11.16 1.76 0.0 0.251553749
200 1741.7 2020.3 2.32 -15.01 0.0 0.0 0.293717545
225 1668.9 1855.1 2.22 -19.58 -2.48 0.0 0.337710758
250 1598.7 1702.3 2.13 -24.92 -5.74 0.0 0.383629352
275 1531.3 1561.6 2.04 -31.12 -9.85 0.0 0.431568794
300 1466.7 1432.8 1.95 -38.25 -14.88 0.0 0.481620161
 

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Discussion Starter · #8 ·
I sectioned one, the hollow cavity is fairly shallow, it stops well above the top groove, so all of the shank would remain intact after impact. :)

Tim
 

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Discussion Starter · #10 ·

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Years ago I read an article about spitzers in the 45-70. I think they were using Northern Precision bullets, but I can't be sure anymore. In any case they found that spitzer bullets did not flatten the trajectory of the 45-70 that much. This is due to the fact that bullet drop has a lot more to do with initial velocity (or more properly, time in flight) than B.C., at least at the 0-200 or 300 yard range.

However, at 150 yards and beyond the spitzer bullets were arriving on target with considerably more energy than flat point or roundnose bullets. Now, looking at Tim's ballistics chart, this bullet does make the 45-70 a nice 250 yard gun if you sight in for 200 yards and if you can stand shooting those pills at 2400fps. That is nearly 375 H&H velocity in a much lighter rifle. Start them off at the 1900fps of the 458 Socom and the drop should be much more significant.
 
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