30 mrod build



Author Topic: 30 mrod build  (Read 1345 times))

Offline Bob Pratl

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Re: 30 mrod build
« Reply #40 on: February 16, 2019, 06:48:03 PM »
Bob,
  I spoke with Jim and his recommendation was "You would need to mill the back of the magazine pocket for them to fit"  Wondering if it is just the pocket that needs to be machined?
The measurements that I took looks like it will fit the same as the .25 magazine after .062" is removed from the rear of the magazine pocket. Hopefully I will find out in the next couple of days.

Bob Pratl ,
I could be wrong but you may want to check and make sure that your bolt probe tip will have enough clearance once pulled all the way back for the magazine to cycle. Not looking at mine right now but if memory serves me right it’s pretty close. If it didn’t clear then bolt probe would have to be shortened which then in turn wouldn’t seat your bullet/pellet far enough past the barrel port. A sixteenth of an inch don’t sound like much but sometimes it call make all the difference.
Just saying,
Chris
Chris, you may be right about the probe clearance but after I machine the Mag pocket I'm planning to mill in a J-hook slot to retract the bolt once the pellet is seated so hopefully I will be able to modify the breech for the wider magazine to clear the prob. Worst case I would have to fabricate a new breech and start all over. The problem is that I have the equipment but not the time.
  • Gloucester,Massachusetts
.25   Dynamic DAR 25
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.357 Evanix REX
.25   Hatsan Bullboss
.25   Benjamin Marauder-being converted to .30
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Yong Heng Compressor

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Re: 30 mrod build
« Reply #41 on: February 19, 2019, 02:46:01 PM »
Well I got my bolt sleeved and tried out the magazine with the bolt I have to do some fitting yet to get it to line up a little bit better but it will chamber a pellet . Also made another ssg with the original end cap and 15 lb flat spring . It compresses far enough I may be able to use it as it is which is 4 inches long
  • USA   Dakota.  MN

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Re: 30 mrod build
« Reply #42 on: February 20, 2019, 08:41:21 PM »
I'm planning on a shroud I found aluminum tubing at my local hardware store once I get the other barrel I'll get the aluminum tube and make a full shroud for the 30 Cal upper
  • USA   Dakota.  MN

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Re: 30 mrod build
« Reply #43 on: February 21, 2019, 07:24:06 PM »
Well I put the upper on my bottle rod tonight with a heavier hammer and 15 lb spring simplified balanced valve haven't adjusted transfer port yet for .200 all the way threw it's probably about 170 or a tad less . Took 3 shots messing with the ssg a little bit 641 643 and 642 fps. I know my transfer port is choking it down since I had it adjusted to just 50 ftlbs with the 25 Cal . I milled out so the bolt gets pushed all the way forward and then comes back to the original channels on the side also did this to my 25 upper it pulls the bolt back about a 1/8 inch from the the pellet so far so good just need more fps this barrel is only 18 inches long to so that doesn't help any
  • USA   Dakota.  MN

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Re: 30 mrod build
« Reply #44 on: February 21, 2019, 07:37:45 PM »
Pic with it on my bottle rod it will be nice to have to 2 different Cal uppers
  • USA   Dakota.  MN

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Re: 30 mrod build
« Reply #45 on: February 22, 2019, 07:23:04 PM »
Well I hit 724 by opening the transfer port screw open and with a short barrel which is like 17 3/4 inches or something like that I should be able to get to 800 at least with a 24 inch barrel this is also regulated to 2100 from the 4500 bottle low 800s to mid 800s  for fps I'll be happy with  I got some more messing around with the magazine yet to do also
  • USA   Dakota.  MN

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Re: 30 mrod build
« Reply #46 on: February 22, 2019, 07:48:04 PM »
740 fps with 18 inch barrel .200 porting and 50.15 jsb pellets 15 lb flat wire spring and a mds 45 gram hammer
  • USA   Dakota.  MN

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Re: 30 mrod build
« Reply #47 on: February 22, 2019, 10:09:29 PM »
My Yong Heng blew a burst disc made one out of a pellet tin also found a couple loose fittings probably from heating and cooling it gets up to 60 degrees and I had to cycle it a few times to get my large 88 cuft up to 4000 psi doesn't take to long even with the cycling it's still faster than the shoe box which I now have for a back up I'll have to refreeze my jugs of ice and finish topping it off tomorrow
  • USA   Dakota.  MN

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Re: 30 mrod build
« Reply #48 on: February 22, 2019, 10:23:55 PM »
Got the mag almost completely working I got one pellet out of the 5 that is getting hung up alittle more tweeking and I should have it working I can't wait for the other barrel so I can build a shroud this thing is loud with out one
  • USA   Dakota.  MN

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Re: 30 mrod build
« Reply #49 on: February 23, 2019, 09:53:44 PM »
I picked up the aluminum tube for the shroud today and found 7/8 wooden dowl fit inside snuggly and decided to try use it for the shroud baffles which seems to work
  • USA   Dakota.  MN

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Re: 30 mrod build
« Reply #50 on: March 06, 2019, 06:40:32 PM »
Got the barrel the other day finished machining and put in a .200 tp hole put it on the lower and tried it with 45 gram hammer 15 lb flat spring on a ssg barrel is 24 inches first couple shots 790 792 almost 800 which is where I want to be I may have to try the 17 lb spring yet
  • USA   Dakota.  MN

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Re: 30 mrod build
« Reply #51 on: March 06, 2019, 07:38:23 PM »
I switched to 17 lb flat spring and found I was having a lot of air escaping by the bolt even though it was half way tight fit so I took and machined a spot for a oring in the bolt and that got me to 819 and 814 fps at a 2100 set reg with about 70 cc plenum 50 gr jsb pellet
  • USA   Dakota.  MN

Offline msurf

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Re: 30 mrod build
« Reply #52 on: March 07, 2019, 01:08:59 AM »
Climbing on up there!  Curious on how you turned the bolt for the seal?  I have read it is a bear to get the cocking handle off of the Marauder bolts. 
How is the moderator working out?
  • Kihei, Hawaii
Crosman 1377 .177 (1978)
Crosman 760  .177 (1976)
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Gamo Urban .22
Umarex Gauntlet .22
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Sam Yang Dragon Claw 500cc .50

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Re: 30 mrod build
« Reply #53 on: March 07, 2019, 02:41:08 PM »
I chucked it in the lathe with the handle between the jaws
  • USA   Dakota.  MN

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Re: 30 mrod build
« Reply #54 on: March 07, 2019, 02:44:05 PM »
I'm still in the process of making the shroud it will be 32 inches long
  • USA   Dakota.  MN

Offline PCPhack

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Re: 30 mrod build
« Reply #55 on: March 09, 2019, 11:02:05 AM »
I look forward to seeing the final build. You have made great progress so far.
  • Texas, USA

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Re: 30 mrod build
« Reply #56 on: March 17, 2019, 08:14:55 PM »
Well I got the shroud built and on with 11 baffles it's about a 1/4 inch longer than than my 25 upper with a 5 inch ldc on the end of the shroud  still have to get some paint and paint it up also need to find a slow leak in my bottle lower
  • USA   Dakota.  MN

Offline bear air

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Re: 30 mrod build
« Reply #57 on: March 18, 2019, 01:52:56 AM »
Great build going to follow
  • Sioux City IA, USA
Benjamin Armada 25 cal                                       Benjamin Marauder 22 cal                                        Diana Stormrider 22 cal                                         Beeman Quiet TEK 22 & 177 cal                    Beeman Silver Kodiak x2 22 cal & 177cal                Psalm 107:14  He brought them out of darkness and the deepest gloom and broke away their chains

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Re: 30 mrod build
« Reply #58 on: March 18, 2019, 02:46:36 PM »
So I couldn't get the magazine to work one pellet out of the 5 was giving me problems other was cocking off to side some and would bind up the mag I sanded the holes to wide . I'm going to cut apart the mag and make it into a single shot tray I'll fill the areas with jb weld and groove out a new area for the tray and pellet to line up in
  • USA   Dakota.  MN

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