.264 cast bullet trajectory

[wap41]

Don't have my books handy curious about trajectory of .264 140 gr cast bullet out to 200yds @1500fps

[Martin Luber]

Google the jbm ballistic calculator, tells you all you want to know. The bc is 0.3 for that bullet

[Martin Luber]

I had the sheet handy, if zeroed at 100, the drop is 7.8 moa or 16.4 inches.

[Harter66]

Strelok is handy on your phone .

[wap41]

Thanks Martin

[Tom Myers]

Don't have my books handy curious about trajectory of .264 140 gr cast bullet out to 200yds @1500fps

I have not come across any 0.264 bullets weighing 140 grains that are suitable for most 6.5mm Chambers as the bullet is so long that it would need to be seated quite deep within the case when the front band is touching the rifeling.

Looking at the SAAMI chambers, the 6.5 Creedmore has a freebore section that is quite long but still not deep enought to bring the bullet base up near the shoulder/neck junction of the cartridge.

This is probably more than you want to know but today is my "Play Day" so I used the Cast Bullet Design ~ Ultimate (https://www.tmtpages.com/#ultimate) software to create a 140 grain bullet that is a glove fit to the 6.5 Creedmoor chamber, throat and bore.

http://www.tmtpages.com/LinkSkyImages/forum_images/6.5%20Creedmoor/6.5%20Creedmore%20bullet.JPG

http://www.tmtpages.com/LinkSkyImages/forum_images/6.5%20Creedmoor/Precision_Software_6.5_Creedmoor_140_gr_Sketch.Jpg

http://www.tmtpages.com/LinkSkyImages/forum_images/6.5%20Creedmoor/SAAMI_6.5_Creedmoor_Lg.Jpg


I then plugged that bullet into the Precision Load Records (https://www.tmtpages.com/New_Prec_Rec/Prec_Rec-Bas.htm) to create a load using the Custom 6.5 Creedmoor bullet.

http://www.tmtpages.com/LinkSkyImages/forum_images/6.5%20Creedmoor/6.5%20Creedmoor~SAAMI%20Rifle~Precision%20Software-6.5%20Creedmoor~_OAL-2.789~H4831-29.4gr_Load,%201.Jpeg

I then plugged the bullet and cartridge data into QuickLoad to find a charge that would produce 1500 fps for that cartridge and bullet.
Hodgdon H4831 turned out to be one of the low pressure and with the most bulk ( 70% ) of the readily available powders that produced a Muzzle Velocity of 1500 fps.

I opened the Precision Ballistics Ver. 5 (https://www.tmtpages.com/New_Prec_Bal/bal.htm) application and calculated the Ballistics and Trajectory for the 6.5 Creedmoor bullet.

For what it's worth, this is the final result.

http://www.tmtpages.com/LinkSkyImages/forum_images/6.5%20Creedmoor/6.5%20Creedmore%20140%20gr%20bullet%20trajectory.J PG

http://www.tmtpages.com/LinkSkyImages/forum_images/6.5%20Creedmoor/6.5%20Creedmore%20140%20gr%20bullet%20trajectory%2 0chart.JPG

Hope this helps.

[shdwlkr]

tom how about in a .264 win mag rifle what bullet would work?

[Tom Myers]

tom how about in a .264 win mag rifle what bullet would work?

The N.O.E. Mould # 266-126-FN (https://noebulletmolds.com/site/shop/264-6-5mm/266-126-fn-ao3/266-126-fn-ao3-3-cavity-gc-6-5-grendel/)is a good fit to the 264 Winchester Magnum Chamber.



http://www.tmtpages.com/LinkSkyImages/forum_images/264%20Winchester%20Magnum/N.O.E._Mould_266-125-FN_(GC)_124_gr_Sketch.Jpg http://www.tmtpages.com/LinkSkyImages/forum_images/264%20Winchester%20Magnum/264%20Winchester%20Magnum~SAAMI%20Rifle~N.O.E.%20B ullet%20Moulds-266-125-FN%20(GC)~_OAL-3.180~Powder-76.07gr_Load,%201.Jpeg

http://www.tmtpages.com/LinkSkyImages/forum_images/264%20Winchester%20Magnum/N.O.E._Bullet_Moulds_266-125-FN_(GC)~500-pi.Bmp

http://www.tmtpages.com/LinkSkyImages/forum_images/264%20Winchester%20Magnum/264_264_Winchester_Magnum_SAAMI_Rifle~500-pi_N.O.E._Bullet_Moulds_266-125-FN_(GC)~500-pi_Lg.Jpg


And, although a bit short in the front band, it should also work well in the 6.5 Creedmoor chambering.

http://www.tmtpages.com/LinkSkyImages/forum_images/264%20Winchester%20Magnum/6.5_Creedmoor_SAAMI~N.O.E._Moulds_266-125-FN_Lg.Jpg

Hope this helps.

[shdwlkr]

thanks Tom