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40-65 win questions? (Read 19160 times)

Schuetzendave Frequent Elocutionist Offline Retired Ex-Shooter Posts: 4022 Location: St. Albert, Alberta Joined: Jan 28^th, 2005	Re: 40-65 win questions? Reply #45 - Mar 8^th, 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 8^th, 2018 at 6:23pm by Schuetzendave »

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svartkruttgris#369 Frequent Elocutionist Offline Posts: 2980 Location: Colorado, Norway, Sweden Joined: Oct 28^th, 2014	Re: 40-65 win questions? Reply #46 - Mar 8^th, 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.


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CW Senior Forum Member Offline Posts: 495 Joined: Feb 20^th, 2018	Re: 40-65 win questions? Reply #47 - Mar 8^th, 2018 at 7:43pm	Print Post
	beltfed wrote on Mar 8^th, 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?


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beltfed Frequent Elocutionist Offline Posts: 1748 Location: Central Wi Joined: Dec 20^th, 2007	Re: 40-65 win questions? Reply #48 - Mar 8^th, 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


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Ranch13 Oldtimer Offline Posts: 541 Location: East Central Wy. Joined: Jan 20^th, 2018	Re: 40-65 win questions? Reply #49 - Mar 8^th, 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


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CW Senior Forum Member Offline Posts: 495 Joined: Feb 20^th, 2018	Re: 40-65 win questions? Reply #50 - Mar 9^th, 2018 at 11:36am	Print Post
	beltfed wrote on Mar 8^th, 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?


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beltfed Frequent Elocutionist Offline Posts: 1748 Location: Central Wi Joined: Dec 20^th, 2007	Re: 40-65 win questions? Reply #51 - Mar 16^th, 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


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beltfed Frequent Elocutionist Offline Posts: 1748 Location: Central Wi Joined: Dec 20^th, 2007	Re: 40-65 win questions? Reply #52 - Mar 16^th, 2018 at 11:39am	Print Post
	OH, Paper is Roselle tracing paper at 0.00175" or so. beltfed/arnie


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Ranch13 Oldtimer Offline Posts: 541 Location: East Central Wy. Joined: Jan 20^th, 2018	Re: 40-65 win questions? Reply #53 - Mar 16^th, 2018 at 3:19pm	Print Post
	beltfed wrote on Mar 16^th, 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?


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beltfed Frequent Elocutionist Offline Posts: 1748 Location: Central Wi Joined: Dec 20^th, 2007	Re: 40-65 win questions? Reply #54 - Mar 16^th, 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


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Ranch13 Oldtimer Offline Posts: 541 Location: East Central Wy. Joined: Jan 20^th, 2018	Re: 40-65 win questions? Reply #55 - Mar 16^th, 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.


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beltfed Frequent Elocutionist Offline Posts: 1748 Location: Central Wi Joined: Dec 20^th, 2007	Re: 40-65 win questions? Reply #56 - Mar 16^th, 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


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Ranch13 Oldtimer Offline Posts: 541 Location: East Central Wy. Joined: Jan 20^th, 2018	Re: 40-65 win questions? Reply #57 - Mar 16^th, 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.


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