24hourcampfire.com
24hourcampfire.com
Previous Thread
Next Thread
Print Thread
Hop To
Joined: Aug 2002
Posts: 14,440
S
SU35 Offline OP
Campfire Outfitter
OP Offline
Campfire Outfitter
S
Joined: Aug 2002
Posts: 14,440
Weatherby advertises the 6.5 Weatherby RPM 140-grain Nosler Accubond bullet to 3,075 fps


I'm spinning that same weight 140 AB at 3,100 out of a 22" barrel in 280 AI.

JBM Ballistics tale of the tape

6.5 WBY at 600 yds -49.3......800 yds --117.1
280 AI at ..600 yds -49.4.......800 yds --117.9

No.

BP-B2

Joined: Jul 2008
Posts: 8,517
Campfire Outfitter
Offline
Campfire Outfitter
Joined: Jul 2008
Posts: 8,517
7mm, is larger in diameter !
More whack !!
I have a 280ai, so I am biased.

Joined: Jul 2001
Posts: 59,898
M
Campfire Kahuna
Offline
Campfire Kahuna
M
Joined: Jul 2001
Posts: 59,898
SU35,

Since you didn't list how what zero/scope height you used for your calculations, I ran JBM with Bryan Litz's BC's with a 100-yard zero, 1.5" scope height--and 5 mph 90-degree wind, and wind generally the real problem at extended ranges, not drop. Here's what resulted.

6.5mm 140 AB @ 3075:
157.4 inch drop at 800
26.1 inch wind drift
1625 fps

7mm 140 AB @ 3100:
163.4 inch drop at 800
29.1 inch wind drift
1537 fps


“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck
Joined: Aug 2002
Posts: 14,440
S
SU35 Offline OP
Campfire Outfitter
OP Offline
Campfire Outfitter
S
Joined: Aug 2002
Posts: 14,440
Haha!...you honor me.

As most here would know from my time here on the fire I've been a 6.5 guy since almost forever.

But I have this 700 Ti that I put a factory mountain rifle barrel in 280 that had been punched Ackley.
Couldn't help but want to compare to the latest 6.5 design. Think I'll keep it at 280 Ack. It is also a better cross over for mountain elk.



I went off a 2.6" 100 yd zero and 4,500' elevation Nosler BC's

Copied from JBM

....Range Drop Drop Windage Velocity

6.5... 800 -117.1 -14.0 38.2 4.6 1890.2
7mm 800 -117.9 -14.1 40.2 4.8 1858.5


What were Bryan Litz's BC's ?


Joined: Jul 2001
Posts: 59,898
M
Campfire Kahuna
Offline
Campfire Kahuna
M
Joined: Jul 2001
Posts: 59,898
140 6.5mm--.463 G7
140 7mm--.424 G7

These are averages down to 1500 fps, and are derived both from chronographing and various other factors, including form factors derived from measurements of the bullets.

I have found Bryan's BCs very accurate at longer ranges, which is why I depend on them when testing rifles/scopes/bullets on the local 1000-yard range. They save a lot of time and ammo!


“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck
IC B2

Joined: Aug 2002
Posts: 14,440
S
SU35 Offline OP
Campfire Outfitter
OP Offline
Campfire Outfitter
S
Joined: Aug 2002
Posts: 14,440
Quote
They save a lot of time and ammo!


No kidding, what media can get I get a hold of to see his BC's?

Joined: Feb 2017
Posts: 9
New Member
Offline
New Member
Joined: Feb 2017
Posts: 9
I grabbed a box of 6.5 RPM ammo the other day and pulled the 140gr Accubond, powder charge weighed 64.6grs, the case held 80.1grs of water, the second one held 80.8grs of water, its simply just a 6.5-284 extended, here's a cpl pictures with a

6.5-284 / 6.5 RPM / 280 Ackley

[Linked Image from i1087.photobucket.com]
[Linked Image from i1087.photobucket.com]

6.5-284 / 6.5 RPM / 280 Ackley / empty 6.5 RPM

[Linked Image from i1087.photobucket.com]

Article from a magazine with measured H20 weights

[Linked Image from i1087.photobucket.com]


Because.......I just love rifles
Joined: Jul 2001
Posts: 59,898
M
Campfire Kahuna
Offline
Campfire Kahuna
M
Joined: Jul 2001
Posts: 59,898
You can check out his website, www.appliedballistics.com--but I end up buying the latest edition of his book, BALLISTIC PERFORMANCE OF RIFLE BULLETS, so I can have the latest, best info on hand. It also includes chapters with lots of excellent ancillary info.


“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck
Joined: Aug 2002
Posts: 14,440
S
SU35 Offline OP
Campfire Outfitter
OP Offline
Campfire Outfitter
S
Joined: Aug 2002
Posts: 14,440
Thank you MD, very much!

BCCP, excellent photos! That RPM case necked up shows some great potential.


Moderated by  RickBin 

Link Copied to Clipboard
YB23

Who's Online Now
663 members (163bc, 06hunter59, 09wingates, 007FJ, 160user, 76 invisible), 2,667 guests, and 1,202 robots.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums81
Topics1,187,605
Posts18,398,367
Members73,817
Most Online11,491
Jul 7th, 2023


 







Fish & Game Departments | Solunar Tables | Mission Statement | Privacy Policy | Contact Us | DMCA
Hunting | Fishing | Camping | Backpacking | Reloading | Campfire Forums | Gear Shop
Copyright © 2000-2024 24hourcampfire.com, Inc. All Rights Reserved.
Powered by UBB.threads™ PHP Forum Software 7.7.5
(Release build 20201027)
Responsive Width:

PHP: 7.3.33 Page Time: 0.115s Queries: 14 (0.002s) Memory: 0.8315 MB (Peak: 0.9140 MB) Data Comp: Zlib Server Time: 2024-03-28 13:49:54 UTC
Valid HTML 5 and Valid CSS