Need help on calculations....

[Bluejay]

Hi Gents,
if some of you with knowledgeable background would be so kind to help me with this I'd greatly appreciate it.

I have just been at the range (100 meters = 109 yds?) trying out my latest load and I tried the Boone & Crockett reticle to see the difference by using the 2nd, 3rd and 4th mark down the crosshairs.

Data are as follows:

6,5x57 Rimmed Mauser Caliber
Barrel length : 60 cm.
Estimated velocity : 2800 fps (850 m/sec)
Bullet : .264 129 grs. Hornady SST (BC = 0.485)


The results were as follows:

Center of the cross : +3.8 cm @ 100 meters
1st mark down (small cross) : +9.6 cm. @ 100 meters
2nd mark down (larger cross) : +19.1 cm. @ 100 meters
3rd mark down (small dent) : +24.4 cm. @ 100 meters
4th mark down (Tip of the lower vertical thick line) : +32 cm. @ 100 meters

Now, if possible, basing on the above data, I'd like to know at which distance those marks are zeroed.

Thank you for your help.

Cheers
Bluejay :wink:

 

[FOTIS]

Hi Gents,
if some of you with knowledgeable background would be so kind to help me with this I'd greatly appreciate it.

I have just been at the range (100 meters = 109 yds?) trying out my latest load and I tried the Boone & Crockett reticle to see the difference by using the 2nd, 3rd and 4th mark down the crosshairs.

Data are as follows:

6,5x57 Rimmed Mauser Caliber
Barrel length : 60 cm.
Estimated velocity : 2800 fps (850 m/sec)
Bullet : .264 129 grs. Hornady SST (BC = 0.485)


The results were as follows:

Center of the cross : +3.8 cm @ 100 meters
1st mark down (small cross) : +9.6 cm. @ 100 meters
2nd mark down (larger cross) : +19.1 cm. @ 100 meters
3rd mark down (small dent) : +24.4 cm. @ 100 meters
4th mark down (Tip of the lower vertical thick line) : +32 cm. @ 100 meters

Now, if possible, basing on the above data, I'd like to know at which distance those marks are zeroed.

Thank you for your help.

Cheers
Bluejay :wink:

The best thing you can do is shoot it at long range and see actual drop. but here we go. These calculations are estimated at sea level.

1st mark zeros at 190 yards
2nd mark--------277 yards
3rd mark---------477 yards
4th mark ---------555 yrds

 

[Bluejay]

Hi Gents,
if some of you with knowledgeable background would be so kind to help me with this I'd greatly appreciate it.

I have just been at the range (100 meters = 109 yds?) trying out my latest load and I tried the Boone & Crockett reticle to see the difference by using the 2nd, 3rd and 4th mark down the crosshairs.

Data are as follows:

6,5x57 Rimmed Mauser Caliber
Barrel length : 60 cm.
Estimated velocity : 2800 fps (850 m/sec)
Bullet : .264 129 grs. Hornady SST (BC = 0.485)


The results were as follows:

Center of the cross : +3.8 cm @ 100 meters
1st mark down (small cross) : +9.6 cm. @ 100 meters
2nd mark down (larger cross) : +19.1 cm. @ 100 meters
3rd mark down (small dent) : +24.4 cm. @ 100 meters
4th mark down (Tip of the lower vertical thick line) : +32 cm. @ 100 meters

Now, if possible, basing on the above data, I'd like to know at which distance those marks are zeroed.

Thank you for your help.

Cheers
Bluejay :wink:

The best thing you can do is shoot it at long range and see actual drop. but here we go. These calculations are estimated at sea level.

1st mark zeros at 190 yards
2nd mark--------277 yards
3rd mark---------477 yards
4th mark ---------555 yrds

Thanks POP for taking the time.

I forgot to mention the altitude was about 600 meters ASL (2000 feet?).

I think you have missed out on one mark, probably the one between 277 and 477 :grin:

I will follow your advise to take practical shots at some of those distances, but I think this is a way to start (and take quite a good amount of guessing out)

If you could complete my data I'd appreciate.

A drink on me the next time I come by..... :wink: 8)

Cheers

 

[FOTIS]

Try this site and plug the numbers in. Free site. So use it to death! 8)



http://www.eskimo.com/~jbm/calculations ... tions.html

 

[bullet]

Very cool link POP, thanks for posting it.

 

[old #7]

+1 on the very cool link.
Your the man POP 8)

 

[FOTIS]

Fellas...

there are all posted in the sticky posts at the top of the forums.

See here

http://noslerreloading.com/phpBB2/viewtopic.php?t=2459



:lol: :lol: :lol: