Page Index Toggle Pages: 1 2 3 [4]  Send TopicPrint
Very Hot Topic (More than 25 Replies) 40-65 win questions? (Read 19556 times)
Schuetzendave
Frequent Elocutionist
*****
Offline


Retired Ex-Shooter

Posts: 4051
Location: St. Albert, Alberta
Joined: Jan 28th, 2005
Re: 40-65 win questions?
Reply #45 - Mar 8th, 2018 at 6:10pm
Print Post  
Caliber      0.409      Inches            
Bullet Weight      400      Grains            
Bullet Length      1.275      Inches            
Barrel Twist      16      Inches/turn            
muzzle velocity      1250      fps            
Temperature      50      degrees Fahrenheit (59 is standard)            
Pressure      29.92      inches of mercury (29.92 is standard)            
                       
Sg =      2.58                  

Caliber      0.409      Inches            
Bullet Weight      300      Grains            
Bullet Length      0.956      Inches            
Barrel Twist      16      Inches/turn            
muzzle velocity      1250      fps            
Temperature      50      degrees Fahrenheit (59 is standard)            
Pressure      29.92      inches of mercury (29.92 is standard)            
                       
Sg =      4.27                  
                       
Sg shouldn't be less than 1.4.  If Sg is greater than about 2.0, you may gain some accuracy by going to a slower twist barrel.

When a bullet exceeds 2.0 you are overspinning the bullet and long distance shooters try to do this to accomadate for drag. 
However a 300 grain FN bullet is really overspinning for a 16:1 twist barrel he is choosing to use. 
Some believe this is OK; others are not so sure, specially when the Sg (gyroscopic spin factor) can get larger under warmer temperatures and low pressure systems.                        
Remember FN bullets are shorter than pointier bullets of the same weight and will overspin more because of their shorter length.
« Last Edit: Mar 8th, 2018 at 6:23pm by Schuetzendave »  
Back to top
 
IP Logged
 
svartkruttgris#369
Frequent Elocutionist
*****
Offline



Posts: 2980
Location: Colorado, Norway, Sweden
Joined: Oct 28th, 2014
Re: 40-65 win questions?
Reply #46 - Mar 8th, 2018 at 6:41pm
Print Post  
For 100M-150M, 300grain bullets and BP velocities I have routinely gotten better groups than OP says he needs for 100M deer shooting. These same loads are sorta OK for 200M chickens and poor choice for 300M pigs (my worst scores on 300M pigs were with these loads). With 370grain Saeco  BPCR bullets 10/10 pigs are totally possible, ditto for 385M turkeys. This was all with 16:1 twist 40-65 rifle.

For OP's stated uses, (100M hunting and 100s of meters informal target shooting), a 16:1 twist seems quite suitable, so long as suitable bullets are chosen of each use, BP or nitro loads.

One of my best grouping BP loads was with Lyman 425gr flat nose bullet and most any BP or nitro load. That would have been my hunting bullet, should I ever have taken that rifle hunting. Over kill for anything I hunt, but, from a blind with known distances to game trails, etc. it would have been deadly and a clean killer.
  
Back to top
 
IP Logged
 
CW
Senior Forum Member
****
Offline



Posts: 495
Joined: Feb 20th, 2018
Re: 40-65 win questions?
Reply #47 - Mar 8th, 2018 at 7:43pm
Print Post  
beltfed wrote on Mar 8th, 2018 at 2:55pm:
Todd, 
Here is some results from my 40-65/ 16 twist HiWall
beltfed/arnie


Do I detect a bit of a two diameter bullet showing in the pic of the PP 40-65 bullet?
  
Back to top
 
IP Logged
 
beltfed
Frequent Elocutionist
*****
Offline



Posts: 1755
Location: Central Wi
Joined: Dec 20th, 2007
Re: 40-65 win questions?
Reply #48 - Mar 8th, 2018 at 8:51pm
Print Post  
("Do I detect a bit of a two diameter bullet showing in the pic of the PP 40-65 bullet?")
CW,
Yes. And its working well for several of us.
Front, bore dia slips snugly  on to the lands, and
base fits snugly and centers nicely in FF case mouth and the typical 40-65 freebore.-over 74.5 gr Swiss 1.5 for 1400fps
beltfed/arnie
  
Back to top
 
IP Logged
 
Ranch13
Oldtimer
*****
Offline



Posts: 549
Location: East Central Wy.
Joined: Jan 20th, 2018
Re: 40-65 win questions?
Reply #49 - Mar 8th, 2018 at 9:17pm
Print Post  
Beltfed what are the measurements on the base and the nose of that bullet. I've been shooting the dual diameter in 44 and 45 rifles for several years, and have began to comptemplate one for the 40's
  
Back to top
 
IP Logged
 
CW
Senior Forum Member
****
Offline



Posts: 495
Joined: Feb 20th, 2018
Re: 40-65 win questions?
Reply #50 - Mar 9th, 2018 at 11:36am
Print Post  
beltfed wrote on Mar 8th, 2018 at 8:51pm:
("Do I detect a bit of a two diameter bullet showing in the pic of the PP 40-65 bullet?")
CW,
Yes. And its working well for several of us.
Front, bore dia slips snugly  on to the lands, and
base fits snugly and centers nicely in FF case mouth and the typical 40-65 freebore.-over 74.5 gr Swiss 1.5 for 1400fps
beltfed/arnie


Nice!
Though not a 40cal (this thread) I had Paul Jones make me a two diameterPP 45 cal about 2005. For the reasons you stated, I like mine too.
I should have someone make me one for my 16 T 40-60M. 400-410gr at 1.425" long. That would be good.
How long is that one you have working so well. Shorter maybe?
  
Back to top
 
IP Logged
 
beltfed
Frequent Elocutionist
*****
Offline



Posts: 1755
Location: Central Wi
Joined: Dec 20th, 2007
Re: 40-65 win questions?
Reply #51 - Mar 16th, 2018 at 11:38am
Print Post  
Ranch 13 and CW.
My DDEPP bullet is 1.325" long, elliptical ogive blending into a 0.185" hemi nose.
Base "band" dia is 0.403" patches to 0.410 
Body dia is 0.394, patches to 0.401"
Wt about 373gr from my 9+1 ww/lino
beltfed/arnie
  
Back to top
 
IP Logged
 
beltfed
Frequent Elocutionist
*****
Offline



Posts: 1755
Location: Central Wi
Joined: Dec 20th, 2007
Re: 40-65 win questions?
Reply #52 - Mar 16th, 2018 at 11:39am
Print Post  
OH, Paper is Roselle tracing paper at 0.00175" or so.
beltfed/arnie
  
Back to top
 
IP Logged
 
Ranch13
Oldtimer
*****
Offline



Posts: 549
Location: East Central Wy.
Joined: Jan 20th, 2018
Re: 40-65 win questions?
Reply #53 - Mar 16th, 2018 at 3:19pm
Print Post  
beltfed wrote on Mar 16th, 2018 at 11:38am:
Ranch 13 and CW.
My DDEPP bullet is 1.325" long, elliptical ogive blending into a 0.185" hemi nose.
Base "band" dia is 0.403" patches to 0.410 
Body dia is 0.394, patches to 0.401"
Wt about 373gr from my 9+1 ww/lino
beltfed/arnie


Thanks for the info Arnie. 
How was it you came to settle on the .403 base diameter?
  
Back to top
 
IP Logged
 
beltfed
Frequent Elocutionist
*****
Offline



Posts: 1755
Location: Central Wi
Joined: Dec 20th, 2007
Re: 40-65 win questions?
Reply #54 - Mar 16th, 2018 at 5:07pm
Print Post  
We ended up with the 0.403 so as to end up with 0.409-0.410 patched with our paper. This works with my
9+1 ww/lino as well as with my friend's 16+1 alloy.
 
This is a good fit in my friend's Brg 40-65 and my custom K&P barreled 40-65 FF cases and freebore dia.

beltfed/arnie
  
Back to top
 
IP Logged
 
Ranch13
Oldtimer
*****
Offline



Posts: 549
Location: East Central Wy.
Joined: Jan 20th, 2018
Re: 40-65 win questions?
Reply #55 - Mar 16th, 2018 at 5:10pm
Print Post  
Thanks Armie.
I have a .400 diameter bullet that shoots pretty good, but had not thought about one larger...
Going to have to think on that larger diameter a bit.
  
Back to top
 
IP Logged
 
beltfed
Frequent Elocutionist
*****
Offline



Posts: 1755
Location: Central Wi
Joined: Dec 20th, 2007
Re: 40-65 win questions?
Reply #56 - Mar 16th, 2018 at 8:38pm
Print Post  
Ranch 13,
One thing, before ordering a new mold or 
having your 0.400 hogged out, can you try 
thicker paper?
OTOH, its best to stay with thinnest , but good quality
strong paper. that along with a large enough bullet diameter
to make sure that paper is pressed into the grooves and cut by the lands


beltfed/arnie
  
Back to top
 
IP Logged
 
Ranch13
Oldtimer
*****
Offline



Posts: 549
Location: East Central Wy.
Joined: Jan 20th, 2018
Re: 40-65 win questions?
Reply #57 - Mar 16th, 2018 at 11:36pm
Print Post  
Arnie, I've been wrapping this .400 diameter bulelt in 8 lb.and it has to be set pretty deep in the case to chamber in all 3 of our 40 cal rifles. I do have some 7 lb I want to try, as I think with the tight chamber in the 40-70 it may shoot a bit better. This bullet only weighs 360 gr, but its the only one that will stay stable in the wind in the 40-70.
The 40-65 and the 40-90 aren't quite so picky, but I'm thinking one of the nose pour adjustable moulds from Brooks might be just the ticket.
  
Back to top
 
IP Logged
 
Page Index Toggle Pages: 1 2 3 [4] 
Send TopicPrint