CVA Paramount Update

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Well I made it out to the range for a little while today, but only shot the ML a few times. Its a long story, was going to try to load a sabboted 40cal and it was a bit too tight for my comfort level, so I had to take the breach plug out and push it back out the other end (it wasn't in more than an inch or so), but you know how that turns out, loose powder everywhere etc. So needless to say, I will check the fit on anything I want to "try out" BEFORE I go to the range from now on. By this time it was approaching 100 degrees I still had to clean everything before I could shoot any more, and a 7-11 Cherry Coke Slurpee was sounding kinda good, so I aborted mission. Not sure its representative of a true result, but no leaking on any of the 3 shots today. However, one interesting thing...I fired a primer to "clear an dry" the breach before I got started, and that variflame adapter came out a little dirty on the sides. Its odd, not sure why it would leak since there was no back pressure at all other than the pressure created by the primer itself prior to finding its way down the tiny breach plug hole. **scratches head** :think:
 
Went to the range today using the new 209 plug. Well it still leaks, however now I have skipped the adding rifle primers to a variflame adapter and having to clean them and only use 10 at a time, so way better in my book. Same issues, some primers leak and others don't. All went off and there were no reliability issues (pretty cool because the primers I had were leftovers before I had kids and my oldest is 20). All in all this setup is better, but its as if I am doing the testing for CVA because apparently they don't. They could have made the bore for the primer in the breech plug a little tighter and it would be mission accomplished. Now I need to see if I can get an o-ring in there to seal it.

Brad your experience is the same as mine. Some adapters leak and some don't, maybe imperfections in the base. What 40 cal sabot did you use? I have been using hornady SST 200 grain with 100 grains of triple 777 until I can get my hands on some Blackhorn 209
 
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It was a light blue Harvester crush rib around a Pittman .402 AccuMax. I probably could have seated it if I pushed through the first couple of inches, but it was just too tight for me to consider it as a long term option so I dumped that idea. I don't think we have enough twist to shoot the high BC 40 cal bullets anyway. I will probably stick to full bore from now on. I have to be honest though, it is tempting to just stop even messing with other projectiles, the darn Powerbelts just shoot so good out of the Paramount. I never thought I would use the words Powerbelt and good in the same sentence, but there it went. I wonder if anyone had performed any expansion testing at various velocities for the ELR yet.
 
I'm glad your experience is good with the powerbelt ELR. I bought an extra pack, but have yet to even try one with the powder I have, I want to wait to get that blackhorn, plus these are a bit cheaper and they shoot really accurate at 100 yards at least.
 
That is really cool. How are you setting head space? Small thin bushings? If so, it would be cool if the bushings could be added to the bolt head rather than the breach plug.
 
That is really cool. How are you setting head space? Small thin bushings? If so, it would be cool if the bushings could be added to the bolt head rather than the breach plug.

I can headspace it two ways. If it were a very small amount, I would be fine with under the bolt head. I am going to laser cut .001" stainless shim stock to make the spacers. This design is pushing under the primer rim so I'd imagine there wouldn't be much variance. I was going to also try pushing on the primer end to end but that has a much greater variance. The breech plug is two pieces. I can shim the primer pocket itself, not the actual breech plug to barrel seal. Mine only has .049" firing pin protrusion, I wouldn't think it would be good to rob too much of that.
 
Ok your explanation makes good sense now. You threaded the primer holder to screw into the back of the breach plug. If you remove the breach plug it doesn't affect the primer holder/pocket/nipple or whatever you would call it, so you don't have to worry about losing the shims. That accomplishes the same thing as far as I am concerned. Interested to hear how well it shoots.
 
Ok your explanation makes good sense now. You threaded the primer holder to screw into the back of the breach plug. If you remove the breach plug it doesn't affect the primer holder/pocket/nipple or whatever you would call it, so you don't have to worry about losing the shims. That accomplishes the same thing as far as I am concerned. Interested to hear how well it shoots.

Yup, as seen below. I actually did this design for some break action stuff but figured I'd use it for the CVA also, to keep as much firing pin protrusion as I could.
20190819_141536.jpg
 
I've got Arrowhead Gen2 Plugs for the paramount done. Bolt heads to follow in a week or two.

Are those breech plugs front or rear sealing? Diameter and length? Bushing? Can you show a pic of the powder side?
 
I haven't seen one of these LRMP modules in person but now seeing one inserted in a closed bolt, I can tell they are way bigger than the Variflame modules. That would be super handy. It may be easier to load/remove them with my bare fingers instead of digging out the variflame tool. Like, are you planning to have the bolt head hold the primer module or will it need to be inserted into the breach plug?
 
And one more question, I'm a bit new to the custom breach plug space. Is the separate bushing in your plug for setting head space? I am guessing the allen set screw tightens pushing the bushing back into the front of the LRMP module which seats completely through a hole in the front of the breach plug? Or is the bushing simply for flame channel/replacement after wear? If that is the case, then this is probably not a ship/customer install option unless there is another way to set headspace without a lathe.
 
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