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25 Long RF chamber drawing, Source? (Read 3208 times)

Dellet Frequent Elocutionist Offline Posts: 1130 Joined: May 19^th, 2017	25 Long RF chamber drawing, Source? Feb 16^th, 2018 at 11:48am	Print Post
	Does any one have a source or link to a drawing they could post or share?


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broken_arrow Full Member Offline Posts: 202 Location: Lancaster County Joined: Aug 12^th, 2008	Re: 25 Long RF chamber drawing, Source? Reply #1 - Feb 17^th, 2018 at 10:47am	Print Post
	The Handloader's Manual Of Cartridge Conversions shows the .25-10 Halsted as the centerfire version of the .25 Stevens. case length 1.125 inch head diameter .278 (.280 max.) rim diameter .333 ( .340 max.) neck diameter .276 loaded length 1.395 rim thickness .050 I have some .25 Stevens Long RF rounds that I could measure for you if it helps.

	ASSRA #10186 (10-25-2021) Every Mighty Oak Was Once A Little Nut That Held Its Ground
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Dellet Frequent Elocutionist Offline Posts: 1130 Joined: May 19^th, 2017	Re: 25 Long RF chamber drawing, Source? Reply #2 - Feb 17^th, 2018 at 12:25pm	Print Post
	Thanks. I have cartridges and a couple barrels that have been cast over the years, but nothing to compare to for actual measurements of what the chamber should be. More academic than anything.


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Redsetter Frequent Elocutionist Offline Posts: 3468 Location: New York Joined: Aug 6^th, 2013	Re: 25 Long RF chamber drawing, Source? Reply #3 - Feb 17^th, 2018 at 12:59pm	Print Post
	broken_arrow wrote on Feb 17^th, 2018 at 10:47am: The Handloader's Manual Of Cartridge Conversions shows the .25-10 Halsted as the centerfire version of the .25 Stevens. case length 1.125 inch head diameter .278 (.280 max.) rim diameter .333 ( .340 max.) neck diameter .276 loaded length 1.395 rim thickness .050 I have some .25 Stevens Long RF rounds that I could measure for you if it helps. Very close to dimensional drawing in Rimfire Rifleman, which has large drawings of all rimfires available in 1947. For ex., rim thickness is given as .055", head dia. .336", OAL 1.385".


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Dellet Frequent Elocutionist Offline Posts: 1130 Joined: May 19^th, 2017	Re: 25 Long RF chamber drawing, Source? Reply #4 - Feb 17^th, 2018 at 3:20pm	Print Post
	Even a proper headspace would be apprecisted


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Redsetter Frequent Elocutionist Offline Posts: 3468 Location: New York Joined: Aug 6^th, 2013	Re: 25 Long RF chamber drawing, Source? Reply #5 - Feb 17^th, 2018 at 3:39pm	Print Post
	Dellet wrote on Feb 17^th, 2018 at 3:20pm: Even a proper headspace would be apprecisted Wouldn't adding .001-2" to rim thickness give you that?


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marlinguy Frequent Elocutionist Offline Ballards may be weaker, but they sure are neater! Posts: 16711 Location: Oregon Joined: Feb 2^nd, 2009	Re: 25 Long RF chamber drawing, Source? Reply #6 - Feb 17^th, 2018 at 3:39pm	Print Post
	Redsetter wrote on Feb 17^th, 2018 at 12:59pm: For ex., rim thickness is given as .055", head dia. .336", OAL 1.385". Wouldn't that .336" be rim diameter, not head?

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Dellet Frequent Elocutionist Offline Posts: 1130 Joined: May 19^th, 2017	Re: 25 Long RF chamber drawing, Source? Reply #7 - Feb 17^th, 2018 at 3:50pm	Print Post
	Redsetter wrote on Feb 17^th, 2018 at 3:39pm: Dellet wrote on Feb 17^th, 2018 at 3:20pm: Even a proper headspace would be apprecisted Wouldn't adding .001-2" to rim thickness give you that? Normally I would say yes, 0-.008". But everything I find for bullet diameter says .251", and every bullet and bore I measure is .256"+. Measuring the depth of relief for the rim in three barrels compared to available cartridges is .003"-.110". Seems reasonable.


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Redsetter Frequent Elocutionist Offline Posts: 3468 Location: New York Joined: Aug 6^th, 2013	Re: 25 Long RF chamber drawing, Source? Reply #8 - Feb 17^th, 2018 at 5:02pm	Print Post
	marlinguy wrote on Feb 17^th, 2018 at 3:39pm: Wouldn't that .336" be rim diameter, not head? Sorry, yes. Measurement given for max bullet dia. is .257".


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uscra112 Frequent Elocutionist Offline Posts: 4079 Location: Switzerland of Ohio Joined: May 7^th, 2007	Re: 25 Long RF chamber drawing, Source? Reply #9 - Feb 22^nd, 2018 at 12:56am	Print Post
	Body diameter is .277. Chambers I have measure .280 to .282. Too large, in my estimation. But with the data posted so far, draw up a chamber that will mimic a good .22 RF Magnum chamber, just bigger diameter. Are you planning to make, or have made, a reamer?

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Dellet Frequent Elocutionist Offline Posts: 1130 Joined: May 19^th, 2017	Re: 25 Long RF chamber drawing, Source? Reply #10 - Feb 23^rd, 2018 at 11:35pm	Print Post
	The 280+/- is consistent with fired brass, but there seems to be a taper from the base forward about .002”. The other question that has come up with barrel variations is rim diameter. I have 3 barrels. A favorite, 44, 44 1/2. All 3 are different. I am thinking about a reamer and part of the turmoil is if I really want to duplicate original. It could be fun to modernize the round a bit. The 17 WSM case can hold up to more pressure, so the thought has occurred to cut the chamber to allow a longer bullet. The seated depth for the original cartridges is excessive for a single shot, so it would be possible also move the bullet out for more case capacity. As well as having a slightly longer case than the original when converted. It might be possible to get an 85-90 grain bullet to a usable velocity, in the 44 1/2. Using smokeless would make that no problem in a modern action, the brass would become the weak point again.


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frnkeore Frequent Elocutionist Offline Posts: 7390 Location: Central Point, OR 97502 Joined: Jun 16^th, 2010	Re: 25 Long RF chamber drawing, Source? Reply #11 - Feb 24^th, 2018 at 2:35am	Print Post
	As I remember, the 25RF twist, is 17. The 87 gr bullet is about all you can get to stabilize in a 14 twist. The 257420, with the GC reamed off, would stabilize and be a excellent bullet for that 22 mag RF brass. I shoot it in my 18 twist, 25/20 SS w/o tipping. Frank

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Dellet Frequent Elocutionist Offline Posts: 1130 Joined: May 19^th, 2017	Re: 25 Long RF chamber drawing, Source? Reply #12 - Feb 25^th, 2018 at 7:40pm	Print Post
	That's the decision I need to make. A new barrel will be part of the project, so I may just go to at least a 1/12. That way if this does not work out I can rechamber for something else.


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