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Loading 25-20 SS (Read 424 times)

Green_Frog Frequent Elocutionist Offline "It ain't easy being green" ASSRA Life #281 Posts: 4160 Location: Lynchburg, VA Joined: Apr 18^th, 2004	Loading 25-20 SS Apr 21^st, 2026 at 1:31pm	Print Post
	Some time ago someone posted a pet load of 7.0 gr of 4759 topped with a 75-85(?) grain bullet. Is anyone out there still loading 4759 in their 25-20 SS or still have data in their logs for it? I got one of the last big jugs of surplus (pull down) 4759 and have both the Lyman 257243 mould and the Ideal Perfection mould labeled simply 2520 which goes from about 46 gr to 95 or so. I’ve got some ooooold W-W brass as well as a small batch of new Jamison on its way. With the old brass especially I plan to start with very light charges and work up carefully. Any and all tested 4759 loads for bullets in the range mentioned will be greatly appreciated. Froggie


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Bent_Ramrod Frequent Elocutionist Offline Posts: 1574 Location: Southern Arizona Joined: Feb 8^th, 2006	Re: Loading 25-20 SS Reply #1 - Apr 21^st, 2026 at 4:17pm	Print Post
	Hey, GF: My 044-1/2 in .25-20SS likes 6 gr 4759 with either the Ideal or Rapine 77-gr bullet or the Lyman 257463. I can usually keep 5 shots under 2-1/2" or so at 100 yd with this combination. My relined and rechambered Winchester LoWall likes 7 gr 4759 with the 257463. My relined and rechambered Stevens 44-1/2 does pretty well with 8.5 gr of 4759 behind the 25720 90-gr bullet out of my Rohrbacker Yankee mould. I find the 75-gr or so weight bullets do better than the 87-90 gr weights in the standard twist barrels in .25-20SS.


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Green_Frog Frequent Elocutionist Offline "It ain't easy being green" ASSRA Life #281 Posts: 4160 Location: Lynchburg, VA Joined: Apr 18^th, 2004	Re: Loading 25-20 SS Reply #2 - Apr 22^nd, 2026 at 3:17pm	Print Post
	Thanks, B_R! That’s just the kind of first hand info I was looking for. I’m thinking that fixed cavity mould is going to throw an 87 gr bullet and make my original bbl less than happy. I’ll have to adjust the perfection mould down to find what it likes best and use those. Anybody else wanna chime in? Froggie


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oneatatime Frequent Elocutionist Offline Posts: 4416 Location: Rocky Mountains Joined: Oct 30^th, 2011	Re: Loading 25-20 SS Reply #3 - Apr 22^nd, 2026 at 11:56pm	Print Post
	With 257420, which is a lighter bullet which works very well in my 13 twist 44 Stevens Model 45 my best loads are 8 grains of 4759, 8.5 grains of 4227 and 6.8 grains of H108. With bullets cast from an old one piece Lyman mould for 25-20 SS that weigh about 78 grains, the best loads were 7.5 grains of 4759 or 2400. With 257463, I use 6.2 grains of H108 so maybe the 4759 equivalent would be in the 7 to 7.5 grain area but a good start with any bullet might be 7 grains of 4759 and work up by half or less grain increments until the target tells you you're there.


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Green_Frog Frequent Elocutionist Offline "It ain't easy being green" ASSRA Life #281 Posts: 4160 Location: Lynchburg, VA Joined: Apr 18^th, 2004	Re: Loading 25-20 SS Reply #4 - Apr 26^th, 2026 at 1:06pm	Print Post
	Oneatatime, that’s some great info!! I was afraid to hope for an H108 load so I’m very happy to get yours. I’ve got well over 10# of that powder stashed (much more than my 4759) and of course it measures like water. It should be easy to funnel into the 25 cal case neck as well. That sounds very good to me. Thanks very much. Froggie


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oneatatime Frequent Elocutionist Offline Posts: 4416 Location: Rocky Mountains Joined: Oct 30^th, 2011	Re: Loading 25-20 SS Reply #5 - Apr 26^th, 2026 at 4:28pm	Print Post
	You're very welcome, Froggie. The H108 loads are my match loads. With the 10,000 plus rounds worth of powder you have you might want to order some more of that Jamison brass;-)


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sportslube Oldtimer Offline Posts: 595 Location: Eau Claire, wi Joined: May 13^th, 2008	Re: Loading 25-20 SS Reply #6 - Apr 26^th, 2026 at 4:48pm	Print Post
	Let’s try H108 in a 10 twist, 118 gr mos bullet


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Green_Frog Frequent Elocutionist Offline "It ain't easy being green" ASSRA Life #281 Posts: 4160 Location: Lynchburg, VA Joined: Apr 18^th, 2004	Re: Loading 25-20 SS Reply #7 - Apr 26^th, 2026 at 5:22pm	Print Post
	I’m not sure the original Winchester barrel has that fast a twist. I’m thinking more like a bullet in the 85 gr range. Of course with only 10,000 or so rounds worth of H108, I hate to waste any of it experimenting! Froggie


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oneatatime Frequent Elocutionist Offline Posts: 4416 Location: Rocky Mountains Joined: Oct 30^th, 2011	Re: Loading 25-20 SS Reply #8 - Apr 26^th, 2026 at 6:33pm	Print Post
	Sportslube, in a 10 twist 25-35 with the Mos it's 8.5 to 9 of H108.


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sportslube Oldtimer Offline Posts: 595 Location: Eau Claire, wi Joined: May 13^th, 2008	Re: Loading 25-20 SS Reply #9 - Apr 26^th, 2026 at 8:10pm	Print Post
	25-20 SS in a low wall, 7.4 grains H108 in a new to me low wall, groups 22 to 25 ring


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