AON 33 Grain Slugs at 115 yards .25 Marauder, the Good an Bad.

Ok been working with slug builders for the last few month. Slugs are great when they sync up with the gun bad when they do not. The problems are getting just the right mix. I been super busy on getting certain slugs to work with over the counter stock guns. Two in particular are the Airforce Condor and Crosman Marauder. They have some rifling in the barrel. My experiment today in 7 to 15 mph winds were fairly lack luster at 55 yards. I could easily out shoot the slugs with the 25.4 jsbs. I was getting at best 3/4 to 1.5 inch groups, not great. I decided to say what the heck and go long distance to see the drop. I really did not expect much. What did i find. Here are a few samples. Basically the groups did not open up as I would have expected them to. 
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Above is out of the .25 Marauder. at 115 yards in high wind. I was really surprised how well they hung in there considering the groups at 55 yards. The funny thing is hitting clay pigeons at 119 yards was not difficult. In comparison there is no way under these conditions that my .25.4 jsbs would of done better. I have seen it all before how the wind man handles jsb pellets. The above was shot from a STOCK .25 Marauder with just barrel cleaning and no tune. I expect in the following weeks to narrow down what will tighen up the groups. The groups were shot around a 2900 PSI fill once the PSI dropped below 2400 groups would open up. Basically I want a method for a low cost gun to shoot slugs with as little modifications as possible. 

If you have any questions feel free to ask. I expect to post more on the journey of improved accuracy.

jay
 
Those are the most accurate slugs I’ve ever shot out of my armada. It’s modified, and I shoot them at 920 ish, very accurate. They are accurate for me all the way to 1000 FPS. Very consistent in size and weight. I did a test through 4 water jugs, the hollow point opens up very nicely. Wicked, accurate varmint round! Looking forward to more of your test. 
 
One shot, funny thing is I did have some issues. I was only pushing them in the 800s. They need more speed. In talking with guys there are some mods to do to get this to shoot in the 900s. I could not find the war valve anymore. Do you have any tips in getting more speed out of this? Dale mentioned a flex tube replacement of some sorts that is cheap. Thanks, Jay
 
The original war valve is not available except on the used market. The hill valve can be opened up from .187 to 1/4 ports if you want a conventional type valve. Hill has a free flowing gauge port for sale also. An mds hammer will make for easier cocking and quicker lock time. 
Alex2865 has presented some good options also. 
I thought jsairguns had a modified stock valve for the marauder, but I don’t see it anymore.