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12/6/2019 7:27:02 PM
Posted: 3/8/2011 12:38:32 PM EST
I recently purchased a used Burris Tac30 here on the EE and was wondering how far off the BDC would be if I mounted it on a .308. Any ideas? anyone done this? Thanks
Link Posted: 3/12/2011 8:15:41 AM EST
I will once the TAC30 gets back from Burris. It will be going on this:



Handloading will really help tune the load for the reticle, which will be 150gr soft point (primarily for pigs) @ 2900 FPS.

Link Posted: 3/16/2011 10:55:07 PM EST
[Last Edit: 3/16/2011 10:55:48 PM EST by CERT-OPR]
I read somewhere the recital is set for 62 gr .223 and was pretty close to the 308 ballistics as well, Anybody know about this? If it helps it would be on a pof 16.5" gun shooting 168 gr ammo
Link Posted: 3/17/2011 4:18:15 AM EST
The subtension of the reticle lead me to believe the BDC is for a 62 gr FMJ bullet traveling @ 3100 fps. You may be a little hard pressed to find a BDC correlation with a 168 gr HPBT @ 2550 fps (from a 16" barrel).

62gr @ 3100 FPS
Range Elevation Velocity Energy ETA Drop Max Y 10mph Wind Deflect
0 yds -2.50 in 3100 fps 1323 fpe 0.000 sec 0.00 in -2.50 in 0.00 in
100 yds 0.00 in 2762 fps 1050 fpe 0.102 sec 1.95 in -0.49 in 1.00 in
200 yds -2.07 in 2447 fps 824 fpe 0.218 sec 8.48 in 1.31 in 4.27 in
300 yds -10.02 in 2155 fps 639 fpe 0.349 sec 20.87 in 4.91 in 10.28 in
400 yds -25.35 in 1882 fps 487 fpe 0.497 sec 40.66 in 11.00 in 19.33 in
500 yds -51.03 in 1635 fps 368 fpe 0.669 sec 70.78 in 20.77 in 32.62 in
600 yds -89.67 in 1415 fps 276 fpe 0.866 sec 113.88 in 35.43 in 50.19 in


2" of drop @ 200
10.5" @ 300
25.6" @ 400
50" @ 500
85.2" @ 600

If you zero the rifle @ 50 yards using the bottom of the aiming point and then using the top of the aiming points for the subsquent BDC you will be close.

Range Elevation Velocity Energy ETA Drop Max Y 10mph Wind Deflect
0 yds -2.50 in 2550 fps 2425 fpe 0.000 sec 0.00 in -2.50 in 0.00 in
25 yds -1.08 in 2506 fps 2342 fpe 0.029 sec 0.17 in -0.96 in 0.01 in
50 yds 0.00 in 2462 fps 2261 fpe 0.060 sec 0.68 in -0.83 in 0.15 in
100 yds 1.08 in 2376 fps 2105 fpe 0.121 sec 2.78 in -0.28 in 0.67 in
200 yds -1.56 in 2208 fps 1819 fpe 0.253 sec 11.78 in 2.11 in 3.10 in
300 yds -11.31 in 2048 fps 1564 fpe 0.394 sec 27.89 in 6.55 in 7.23 in
400 yds -29.14 in 1893 fps 1337 fpe 0.545 sec 52.07 in 13.45 in 13.13 in
500 yds -57.08 in 1748 fps 1140 fpe 0.711 sec 86.38 in 23.57 in 21.61 in
600 yds -96.64 in 1611 fps 969 fpe 0.891 sec 132.29 in 37.58 in 32.58 in



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