Author Topic: .30 Mrod  (Read 8150 times)

Dairyboy

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.30 Mrod
« on: May 26, 2016, 08:49:14 PM »
My .30 cal kit came in from Roy at Mountain Air and man I'm mighty impressed!! Got it all put together except my drill and bits are at the dairy and don't feel like getting them now. Perfect drop in fit for the barrel and the bolt sleeve was a nice tight fit so I'm happy. I just need to get the baffles and end cap and the air stripper drilled out and it'll be ready for tuning!! I was going to get a magazine but being that I'll be shooting both JSBs and Polymags I probably will single load them. Stay tuned for updates on tunes and accuracy.


  • Outlook, WA
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Monkeydad1969

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Re: .30 Mrod
« Reply #1 on: May 26, 2016, 09:25:06 PM »
My .30 cal kit came in from Roy at Mountain Air and man I'm mighty impressed!! Got it all put together except my drill and bits are at the dairy and don't feel like getting them now. Perfect drop in fit for the barrel and the bolt sleeve was a nice tight fit so I'm happy. I just need to get the baffles and end cap and the air stripper drilled out and it'll be ready for tuning!! I was going to get a magazine but being that I'll be shooting both JSBs and Polymags I probably will single load them. Stay tuned for updates on tunes and accuracy.

I have a 2260 (3060) carbine with that barrel and it's very accurate.  I single load my carbine.  Make sure to post pics.

Joe
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Dairyboy

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Re: .30 Mrod
« Reply #2 on: May 27, 2016, 06:32:07 AM »
Here you go Joe. I'm excited to test the accuracy. The barrel was pretty dirty when I got it but 6 passes with ballistol patches and it was squeaky clean. Pushed a JSB 44gr and Polymag through it and got some good bite into the pellets so looks promising. I'm hoping I can get the shroud parts drilled today and get started on a good tune but the fiance is home from college for good now and we've been working on the house every day after work so we'll see...Test fired one lastnite and it has to be pushin them fast cause that sucker kicked pretty good. Can't wait to git er done
  • Outlook, WA
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rsterne

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Re: .30 Mrod
« Reply #3 on: May 27, 2016, 10:07:54 AM »
Any idea what barrel Roy is using?....

Bob
  • Coalmont, BC

Dairyboy

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Re: .30 Mrod
« Reply #4 on: May 27, 2016, 10:29:51 AM »
I believe it's the barrel you designed Bob. He ordered them from TJs and said it was designed for JSB pellets so I'm assuming your barrel is the only one that has been designed for that from TJs.

Here's some numbers I'm rather impressed. Hill .30 cal valve with .210 exhaust port, hill gauge port, NBH, shorty dual spring wire. .187 TP and barrel port. 20" barrel. 7 turns on HS.

3200psi fill

1. 931.0
2. 927.7
3. 934.3
4. 927.3
5. 920.2
6. 900.5
7. 895.1

I got 5 shots with a 1.5% ES at 85fpe~. 7 shots with 4.2% ES. Accuracy was .6" at 25yds but I pulled a shot. I'm assuming it will tighten up once I get some more rounds through it.
« Last Edit: May 27, 2016, 03:30:44 PM by Dairyboy »
  • Outlook, WA
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rsterne

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Re: .30 Mrod
« Reply #5 on: May 27, 2016, 12:14:28 PM »
I would back off the hammer spring just a whisker.... then you would have all 7 shots within a tighter ES....

Bob
  • Coalmont, BC

Dairyboy

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Re: .30 Mrod
« Reply #6 on: May 27, 2016, 12:30:27 PM »
Thats the plan I hoped to get 7 shots at 80fpe and if I can get 5 at 85fpe at 1.5% 7 at 80fpe should be within a nice tight ES
  • Outlook, WA
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ncrary

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Re: .30 Mrod
« Reply #7 on: May 27, 2016, 04:26:03 PM »
This gonna be your new pigeon gun?  Or is this for that cougar?
  • Kennewick, Wa
Newell
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Dairyboy

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Re: .30 Mrod
« Reply #8 on: May 27, 2016, 08:06:02 PM »
This gonna be your new pigeon gun?  Or is this for that cougar?

Newell it's going to be a coyote gun out to 75yds I'm assuming and just for fun on pigeons if I haven't shot it in awhile.  :D

So didn't need to work on the house today so got to play with the tune. Everything's the same except 6 turns on the hammer spring. JSBs 44.75gr

1. 868.9.           3200psi
2. 880.0
3. 875.2
4. 875.9
5. 887.5
6. 887.3
7. 887.3
8. 886.9
9. 886.0
10. 882.7
11. 875.5
12. 866.2
13. 858.2.      2200psi

Shot 2-11 10 shots at 1.38% ES at roughly 77fpe....shot 5-9 5 shots with a 0.1% ES......I think it's safe to say I have 2 very good tunes 5 shots at 85fpe and 10 shots at 77fpe
  • Outlook, WA
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Monkeydad1969

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Re: .30 Mrod
« Reply #9 on: May 27, 2016, 08:08:02 PM »
 ;D
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rsterne

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Re: .30 Mrod
« Reply #10 on: May 27, 2016, 08:27:37 PM »
Yep, 2 great tunes, for sure....

Bob
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ncrary

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Re: .30 Mrod
« Reply #11 on: May 27, 2016, 08:41:22 PM »
Very nice.  I am waiting for the accuracy report.  I  hope this holds good groups out to the 75 yards you want to shoot.  It may do better than that.

Have you considered throwing a regulator?  I wonder how many shots you would be able to get with one.
  • Kennewick, Wa
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rsterne

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Re: .30 Mrod
« Reply #12 on: May 27, 2016, 08:54:26 PM »
You would need a pretty big plenum for a regulated PCP running 80 FPE.... and therefore lose a lot of your reservoir volume.... I don't think they are a great idea for big bores, unless you have a big reservoir (ie bottle)....

Bob
  • Coalmont, BC

Dairyboy

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Re: .30 Mrod
« Reply #13 on: May 28, 2016, 05:06:42 AM »
Yeah I'm hoping to stretch it out on accuracy soon. And yeah no regulator for me I'm happy with my results there better than I hoped and no bottle either as I hand pump.
  • Outlook, WA
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Bob La Londe

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Re: .30 Mrod
« Reply #14 on: May 28, 2016, 08:13:21 AM »
What makes this a 75 yard coyote gun?  I'm not arguing.  Just asking.  Is the slightly larger wound channel that much more effective? 

I know this may not be received the way I mean it, but .22LRHP is often consider a 75 yard round for coyotes, and it has more energy and better ballistics.  Yes, I've seen a few guys take and make shots at 100 +/- with .22LR on yotes, but I've also seen yotes run off.  I know I get so wrapped up in my airguns sometimes I push their limits. 

Inspite of the fact that I have butchered a couple of my airguns and come up with decent results makes me no expert.  I am asking to learn. 
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