I just wanted to do a quick update. I just received my new Impact 30 cal with the power plenum. I haven't had a chance to really test it out yet. Just doing some chrony work on it inside. This is what I am seeing so far.
JSB 44 gr. reg set at 150psi the highest speed I could get here was right at 860fps. If I turned the reg up the speed dropped. I thought these came with a heavier hammer so this wouldn't have been a issue. I thought that the power wheel was almost maxed out, but after checking I had some more room to turn it in.
After I opened up the transferport and the pellet probe, the gun would not load pellets. I did the half moon on the probe, like I have on my 22 and 25 cal impacts, the 30 cal would not feed straight. I had 2 probes like that and neither would feed right. When I put a stock one back in it feed fine. I also checked and was able to get almost a full turn on the power wheel bolt. After doing that mod I was trying the Nielson 49gr slugs. Those where shooting 920fps. That is 92 FPE. Those are some good numbers. Hopefully I can get a little more power out of this with some more tuning. What I plan on doing is cutting the end off of one of the probes and drilling and tapping the end. Getting a rod that has some threads on the end and using that as a new probe end. I don't have access to a lath so I will give that a try for now.
I will give more updates when I get a chance to go out and shoot it and try some more stuff with it. I only got this gun 2 days ago so I haven't had much time to play with it yet.
JSB 44 gr. reg set at 150psi the highest speed I could get here was right at 860fps. If I turned the reg up the speed dropped. I thought these came with a heavier hammer so this wouldn't have been a issue. I thought that the power wheel was almost maxed out, but after checking I had some more room to turn it in.
After I opened up the transferport and the pellet probe, the gun would not load pellets. I did the half moon on the probe, like I have on my 22 and 25 cal impacts, the 30 cal would not feed straight. I had 2 probes like that and neither would feed right. When I put a stock one back in it feed fine. I also checked and was able to get almost a full turn on the power wheel bolt. After doing that mod I was trying the Nielson 49gr slugs. Those where shooting 920fps. That is 92 FPE. Those are some good numbers. Hopefully I can get a little more power out of this with some more tuning. What I plan on doing is cutting the end off of one of the probes and drilling and tapping the end. Getting a rod that has some threads on the end and using that as a new probe end. I don't have access to a lath so I will give that a try for now.
I will give more updates when I get a chance to go out and shoot it and try some more stuff with it. I only got this gun 2 days ago so I haven't had much time to play with it yet.
