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adding a rim to rimless case to make 40/70 What Ch (Read 3438 times)

kensmachine Oldtimer Offline Posts: 570 Joined: Nov 21^st, 2012	adding a rim to rimless case to make 40/70 What Ch Oct 11^th, 2020 at 1:29pm	Print Post
	40/70 What Cheer from 338 lapua 338 Lapua 40/70 or 40/90 What Cheer Base .584 .581 Rim thickness .055 .071 rim Dia. .584 .662 case lenght 70 90 2.715 1.760 2.00 what would be the best solder to use to add the rim Brownell's HI Force melts at 475 is there some other solder that would be better. On the few 44/77 sharps I have made out of 300 win mag the rim is bigger then the Base so I made a stepped rim and loctite them on. thanks ken


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rgchristensen Frequent Elocutionist Offline Posts: 1091 Joined: Jan 2^nd, 2014	Re: adding a rim to rimless case to make 40/70 What Ch Reply #1 - Oct 11^th, 2020 at 6:44pm	Print Post
	KEN: I have made a lot of cases, e.g., 11 Mauser, using regular .375 or other magnum cases by turning down the case heads a bit, and soldering on another rim, using regular 63% tin eutectic solder, with good success. It melts low enough and sticks fine, with no worry about annealing the case heads with the soldering temperature. I machine the final rim shape after soldering, including the "Mauser recess" at the back. Maybe a couple times in 20 years have had a rim pull off a sticky case, which is pretty good performance. Before starting, section one of the donor cases to see how much of a recess you want to turn off before soldering on a rim. I usually turn off enough to eliminate the extractor groove. CHRIS


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kensmachine Oldtimer Offline Posts: 570 Joined: Nov 21^st, 2012	Re: adding a rim to rimless case to make 40/70 What Ch Reply #2 - Oct 12^th, 2020 at 11:00am	Print Post
	What flux do you use Thanks ken


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4060may Full Member Offline Posts: 177 Location: Richfield Joined: Jul 12^th, 2006	Re: adding a rim to rimless case to make 40/70 What Ch Reply #3 - Oct 12^th, 2020 at 11:05am	Print Post
	Ken Cheatin charlie , uses a snap ring for rims on a 43 Spanish RB maybe he will see this post, and post a few pictures


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desert-dude Senior Forum Member Offline Posts: 439 Location: Selah Joined: Jul 23^rd, 2013	Re: adding a rim to rimless case to make 40/70 What Ch Reply #4 - Oct 12^th, 2020 at 11:35am	Print Post
	TMI .... but: a quick google search reveals that the strongest soft solder is 96/4. i.e. 96% Sn and 4% Ag. Looks like it melts at 430 and with that alloy content is likely to be expensive. However, you don't need much per a cartridge. Apparently also good for stainless. Tensile is 15,000, about twice that of other soft solders. 430 F is considerably below the annealing temp so that worry should disappear. HTH


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cheatin_charlie Senior Forum Member Offline Posts: 357 Location: ohio Joined: Jan 10^th, 2009	Re: adding a rim to rimless case to make 40/70 What Ch Reply #5 - Oct 12^th, 2020 at 1:20pm	Print Post
	The snap ring is .630 dia at large size. On .300 win mag cases the rim thickness ends up at about .085 which may be a little too thick for your use. The extraction groove could be opened up by .015 to chamber.


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cheatin_charlie Senior Forum Member Offline Posts: 357 Location: ohio Joined: Jan 10^th, 2009	Re: adding a rim to rimless case to make 40/70 What Ch Reply #6 - Oct 12^th, 2020 at 1:23pm	Print Post
	Snap rings


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J-Team Newbie Offline Posts: 3 Joined: Feb 14^th, 2020	Re: adding a rim to rimless case to make 40/70 What Ch Reply #7 - Oct 15^th, 2020 at 11:53pm	Print Post
	I added some rims to 50BMG so they could be used in 13mm Mauer (T-Gewehr) like this:


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cheatin_charlie Senior Forum Member Offline Posts: 357 Location: ohio Joined: Jan 10^th, 2009	Re: adding a rim to rimless case to make 40/70 What Ch Reply #8 - Oct 16^th, 2020 at 6:33am	Print Post
	Here is an alternative way to do it (You need to *Login* or *Register* to view media files and links)


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ndnchf Frequent Elocutionist Offline Posts: 1050 Joined: Mar 6^th, 2014	Re: adding a rim to rimless case to make 40/70 What Ch Reply #9 - Oct 16^th, 2020 at 11:16am	Print Post
	cheatin_charlie wrote on Oct 16^th, 2020 at 6:33am: Here is an alternative way to do it (You need to *Login* or *Register* to view media files and links) I like this idea. I've saved it for future reference - thanks.


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ratseye Full Member Offline Posts: 202 Location: Eastern, PA Joined: Feb 28^th, 2017	Re: adding a rim to rimless case to make 40/70 What Ch Reply #10 - Oct 24^th, 2020 at 8:14am	Print Post
	JTeam, that is some fine looking machine work on those cases. A lot of skill and effort for sure. I use a similar technique but solder the new rim on. Nice work. Thanks, ratseye


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oldman46 Senior Forum Member Offline Posts: 424 Joined: Sep 21^st, 2016	Re: adding a rim to rimless case to make 40/70 What Ch Reply #11 - Oct 26^th, 2020 at 12:25am	Print Post
	While I'll never use this process (yeah famous last words) Was wondering is any of the locktite adhesives could be used when pressing on the rimmed section on the made up case?. That would elimanate any concerns one would have regarding soldering on any rims. Some of the locktite adhesives beyond what we normally use are for all intents and purposes basically permanent. And just a little dad will do you. Even if pressed on apply a little adhesive with an el cheepo artist's brush and press the rim in place. Frank


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22_boomer Full Member Offline Posts: 172 Location: Florida Joined: Mar 6^th, 2011	Re: adding a rim to rimless case to make 40/70 What Ch Reply #12 - Nov 6^th, 2020 at 8:10am	Print Post
	rgchristensen wrote on Oct 11^th, 2020 at 6:44pm: KEN: I have made a lot of cases, e.g., 11 Mauser, using regular .375 or other magnum cases by turning down the case heads a bit, and soldering on another rim, using regular 63% tin eutectic solder, with good success. It melts low enough and sticks fine, with no worry about annealing the case heads with the soldering temperature. I machine the final rim shape after soldering, including the "Mauser recess" at the back. Maybe a couple times in 20 years have had a rim pull off a sticky case, which is pretty good performance. Before starting, section one of the donor cases to see how much of a recess you want to turn off before soldering on a rim. I usually turn off enough to eliminate the extractor groove. CHRIS Chris, I needed some more cases for my 71/84 Mauser and just trimmed to length some 45-90 Starline cases and turned the rims to match the Mauser. Seemed a lot less expensive than those fancy custom cases and they shot great. Am I doing something wrong?


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