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Author Topic: 100 Yard with .308 BBT  (Read 1516 times)

sixshootertexan

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100 Yard with .308 BBT
« on: February 07, 2016, 11:52:57 AM »
Did some 100 yd paper punching today.
.308 Custom Built rifle
.308 110gr BBT @ 880fps





CCS 2300, CCS 2400, Custom Built Regulated .25, Custom Built PRod Clone, .308 Bullet shooter, XS46U .177

nielsenammo

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Re: 100 Yard with .308 BBT
« Reply #1 on: February 07, 2016, 12:03:25 PM »
Did some 100 yd paper punching today.
.308 Custom Built rifle
.308 110gr BBT @ 880fps




Looking good.

I have some .308's I would like to see how they compare to BBT. Would you like to test them?  If so, pm name and address and I will send them to you.  Mine are 111 grain, .308.
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nielsenspecialtyammo@yahoo.com

sixshootertexan

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Re: 100 Yard with .308 BBT
« Reply #2 on: February 07, 2016, 12:21:30 PM »
Thanks. Right now I'm still testing the rifle. I have not gotten to shoot it much because I did not have my own compressor. That's now solved. I had it tethered to my Ninja tank reg'ed at 2900 but it seems to not like that, the reg that is. It started doing the same thing that it was doing when I rebuild it. I took the rifle filled to 3000psi and shot some Lee 130grs that I had cast. It shot an average of 800FPS for 7 shots. I hooked the tank up to tether it for the rest of my shooting. It filled to 2900 but after a couple shots it dropped to 2700 and would not come back up to 2900.
CCS 2300, CCS 2400, Custom Built Regulated .25, Custom Built PRod Clone, .308 Bullet shooter, XS46U .177

rsterne

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Re: 100 Yard with .308 BBT
« Reply #3 on: February 08, 2016, 10:20:34 AM »
How many shots does the regulator take before it tops off the reservoir?.... It sounds like it is sealing at 2900 psi, but not reopening until the pressure goes below 2700.... Sounds like it's not opening far enough (the travel on the Bellevilles is too small, ie they are too stiff a spring rate).... I would contact Ray at Ninja (he's pretty good at answering inquiries on their thread on the GTA) and let him know what is going on.... but first you have to know what pressure it drops to before topping up to 2900 again.... It is also possible that it is the check valve on the rifle sticking.... I have one gun where it won't click open unless the pressure across it is about 400 psi.... I suspect it is gummed up but haven't as yet pulled it apart to check it....

Bob
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sixshootertexan

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Re: 100 Yard with .308 BBT
« Reply #4 on: February 08, 2016, 02:55:58 PM »
After I hooked up the tank and filled it to 2900 I shot 3 shots and noticed the fps dropped on that third shot. I looked at the gauge on the fill side and it was at 2700. I checked after every shot from there on and it was at 2700. I shot maybe 10 shots, then took an hour break because the range crew came in to replace a swinging target for their cowboy shooting range. When I took the break I disconnected the tank. After they finished I hooked the tank up to shoot my NUAH targets. It was still at 2700. That psi is where I shot my targets at. Today I used a deadhead and it was 3000psi. I then went ahead and fill my rifle and it filled to 2950. The tank still has 3400 in it.
 I'm just wondering if these Ninja regulators can handle the sudden drop in pressure with these big bore rifles.
CCS 2300, CCS 2400, Custom Built Regulated .25, Custom Built PRod Clone, .308 Bullet shooter, XS46U .177

rsterne

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Re: 100 Yard with .308 BBT
« Reply #5 on: February 08, 2016, 09:15:27 PM »
I use a Ninja reg to tether my BigBores without issue.... not sure what your problem is....

Bob
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sixshootertexan

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Re: 100 Yard with .308 BBT
« Reply #6 on: February 08, 2016, 09:48:40 PM »
I'm not for sure either. I've only had this problem since I started tethering to my .308. If I tether again I may set a video camera up to watch the fill gauge and see how far it drops when I pull the trigger. I'm going to do some more testing to see how many shots I can get on a fill anyways. I think I can get 6-7 shots per fill. Once I find that then I'm going to start playing with the RVA to see what it changes.
CCS 2300, CCS 2400, Custom Built Regulated .25, Custom Built PRod Clone, .308 Bullet shooter, XS46U .177