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Post by markb317 on Sept 5, 2011 13:34:03 GMT -5
I would like some thoughts and ideas for a powder chamber. I'm thinking of building a .375 smokeless ml and wanted to get a shorter powder column. Any thoughts or ideas would be appreciated.
Mark
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Deleted Member
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Post by Deleted on Sept 5, 2011 13:52:56 GMT -5
Swinglock has a powder chamber built in their custom mls.
You might could get some ideas from their design.
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Post by Richard on Sept 5, 2011 14:20:12 GMT -5
I would consider doing a "mock-up" out of aluminum or nylon and get an idea of powder capacities. Also consider how you will stop the bullet from entering the "chamber" if it is not full with powder? You might need to mark or put a stop on your ram-rod. I believe Swinglock presses in something on the order of a "washer" with a hole just slightly smaller than the bore. This way, when seating a bullet? It will stop when it hits the washer or what ever arrangement he uses? It might even incorporate a bit of a throat so as to form a "bottleneck" chamber?
Richard
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Post by mountainam on Sept 5, 2011 14:39:30 GMT -5
I was doing some brainstorming for the same reason as are you---- a .375 cal. Why not? You will not have any pistol bullets to deal with--- only REAL rifle bullets in the perfect weight class to dispatch anything from a whitetail to a moose. I believe RB of this site (rest his soul) may have used powder chambers on his smaller designs ,but I have never seen the designs here anywhere. My thought was to have the barrel maker chamber your new barrel for a .375 H&H Magnum. It would fill nicely with it's gradual 15* shoulder. Most barrel makers shudder at someone using their barrels to make a ML. So we have that part of the problem solved. Then you could order it prethreaded for you action and nobody would be none the wiser. When it arrives, you or your trusted gunsmith can thread the I.D. for your 11/16"dia. breechplug. My breechplug measures 1 3/32" long which would eat up some of the .375H&H chamber length making it carry the same capacity of a .358 Win. or thereabouts shortening your powder column. Don't forget to get the barrel supplier to give you the barrel cut-off so you can have Swinglock make you one of their awesome Full-Form sizing dies. You didn't say which action you are thinking about using. Anyway those are just my thoughts. I think a .375 or .358cal sabotless SML is the next logical step in the quest for performance. Hang around, nothing is STATIC on this site. Good luck on your build!
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Post by GMB54-120 on Sept 5, 2011 15:03:29 GMT -5
I believe in theory it should work and 375 would be a good platform for max long range performance and bullet selection. If/When i give it a try, i will be looking at the caliber options and powder column sizes. Short magnums are the rage atm in CFs, so it seems logically that some of that should transfer over to smaller caliber SMLs.
Its too bad no one makes a 40x3XX sabot. Then IMO, you would have tons of options in a more simple design. There are some 36cal sabots but none that would handle smokeless or really useful bullet weights IMO. I bet MMP would sell way more 40x3XX sabots in one year than all the 36cal sabots they have sold in the last 5 years if it was built to handle smokeless.
mountainam, you might be on to something with the 375H&H as the base platform. it sounds very "doable".
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Post by Richard on Sept 5, 2011 15:55:06 GMT -5
Mountainman............the only problem with your theory is that the barrel mfg. would have to have an action to headspace it to? Then, you would have no place to cut the threads for the breech plug as you now have a chamber there  And, as far as having a sabot for the .375 bullet to go in the .40? Then you are back to the blowing sabots/bullet alignment and warm barrel thing? Ask Jon how he is doing with his .375 with the chamber? Richard |
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Post by markb317 on Sept 5, 2011 16:23:40 GMT -5
I would be building this rifle on a Savage CF action, like the .45 McGown smokeless I have.
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Post by mountainam on Sept 5, 2011 17:19:13 GMT -5
Richard, Doesn't the mfgr. usually short chamber anyway? I know ER Shaw does. Even if they don't, the belt dia is .536" or so and it would still need to be bored larger to accept the 11/16"-18 tap for the breechplug thread. You would lose "case capacity" from the length of the breechplug, but you may not need all of that anyway. I'm sure MORE re-thinking is required on my part.
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Post by Dave W on Sept 10, 2011 8:02:27 GMT -5
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Post by dave d. on Sept 10, 2011 9:32:59 GMT -5
 terry on this board has a .358 rb specail that has a powder chamber and jon on this board has a 6mm with a powder chamber that I help him with. Maybe one of these guys will chime in. the best thing to do is narrow down what powders you are going to use and make a mock chamber. Use the minimum amout of the given powder and maybe alittle less and your there. Goodluck sounds like a nice build
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terry on this board has a .358 rb specail that has a powder chamber and jon on this board has a 6mm with a powder chamber that I help him with. Maybe one of these guys will chime in. the best thing to do is narrow down what powders you are going to use and make a mock chamber. Use the minimum amout of the given powder and maybe alittle less and your there. Goodluck sounds like a nice build