mitch
Junior Member
Posts: 90
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Post by mitch on Oct 3, 2022 19:00:15 GMT -5
While my barrel was with my barrel-maker, I came up with an idea and had him spin it up for me. Took a chunk of clear acrylic, machined a chamber in it to receive the plug using the same dimensions as the barrel chamber, and drilled out a rough bore (my build is a 0.402" so used a drill size "Z", 0.413"). This allows me to directly measure the powder column for different loads, see how compressible different powders are, etc. Thought I'd throw it out there in case anyone else thinks the idea has any merit. Some example images are below. Note: these are NOT intended to show "real" or recommended loads; I just threw them in there for representative purposes. As you can see he struggled to get a decent surface finish as well; with a little more experience and testing I think it could have come out much clearer.   |
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Post by Richard on Oct 3, 2022 20:50:27 GMT -5
Good idea Mitch! Nice to see a new face come up with an interesting concept.
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mitch
Junior Member
Posts: 90
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Post by mitch on Oct 3, 2022 20:53:02 GMT -5
Whew, thanks Richard! Ever since I hit "post" I've been grimacing in anticipation the response might be "this is the dumbest ****ing thing I've ever seen"; I'm super new to this so I had no clue if this was a good idea or not, haha. Big weight off my chest, thanks man.
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ronc
Junior Member
Posts: 89
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Post by ronc on Oct 3, 2022 21:23:20 GMT -5
I do like the visual effect idea. I was thinking of doing that with a 40 cal barrel that is no longer serviceable. 62 gr of 4198 in a 40 cal might be a little much even with a 228 gr bullet, probably would be close to 3000 fps.  |
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Post by nick50471 on Oct 4, 2022 7:33:39 GMT -5
Not dumb at all. Every subcal rifle I’ve done has had a powder chamber in it and I’ve made chamber checkers with aluminum. Mine do not have the BP in them. The BP’s hold about 13gr of powder + or - depending on powder. Well done sir, you clearly understand how and why this is important and put that information to use.
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Post by hillbill on Oct 4, 2022 20:02:31 GMT -5
I have 2, both made of Aluminum, one for the 9/16 plug and one for the 5/8.
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ronc
Junior Member
Posts: 89
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Post by ronc on Oct 4, 2022 20:17:58 GMT -5
Bill, did you make them using your standard powder chamber like you cut in your barrels or with no chamber?
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Post by hillbill on Oct 4, 2022 21:03:57 GMT -5
I made mine using the bore size for both plugs, .415 for the 9/16 and .578? for the 5/8 if I remember correctly, that way I can exactly duplicate a given chamber size for each plug. The 5/8 .578 chamber size is much more efficient for a large dose high volume chamber. The 9/16 I used to calculate chamber size in smaller shank barrels as in my break action or the 1.200 shank light .40.
Mine uses the plug and uses a delrin plunger to take measurements with, in effect it will directly duplicate the chamber with plug intact. I made mine about 3 or 4 years ago when I started experimenting with .40 cal powder chambers.
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ronc
Junior Member
Posts: 89
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Post by ronc on Oct 6, 2022 20:19:58 GMT -5
Those make great tools that simplify making accurate repeatable powder chambers. Thanks...
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