Bought the gun new. It was a non stop special order carbine that Remington kept producing in 2017 to 2019. Swapped min out with a grey laminate stock set right off the bat. Tried Hornady super performance ammo through it with 1.5” 100 yard groups. I also tried 180 grain speer hot cores, 200 grain spire points, and 180 grain Barnes TSSX tipped. About 5 ot more powders with each. Lee collet factory crimped and no crimp tested. Groups were all 2.5” to 3” plus. Then experimenting with Cast I found out it wouldn’t feed Cast or jacketed. The barrel slugged at .358”. Both my 35 Rems slug at .357. The magazine tube worked its way loose during my shooting session as well. I sent it back into Remington because it wouldn’t feed. I also told them that the magazine tube worked its way loose. It had some good looking gouges in it from some burrs inside the housing it slides into when cycling. I removed it and files the burrs. Much better. Anyways, Remington said they would replace the mag tube. So ask them to look at the barrel, figuring that it was over bored, probably ruff cut, and out of spec. It was right when they were going bankrupt a few years back. It took months to get it back. No notes other than they said they got it to feed and sent back a note saying that it shot a three-quarter inch group with 200 grain factory ammo. When I called to ask what was done I wasn’t really told anything other then I was told that they didn’t replace the barrel and that it was within spec. It’s been sitting in my safe ever since. I finally loaded up some jacketed ammo to try that I powder coated to increase the diameter to .3595”. Took it out a week prior to test different powders in 180 grain Hot cores. They all grouped 3 to 4 inch plus groups. Got it sighted in probably an inch and a half high 100 yards. So I went home, scratched my head and decided to powder coat some jacketed bullets. I figured I try heavier ones as well since I haven’t tried them yet. The 220 speer and 250 hornady Spire point. Before I powder coated them, I measured them all. Now take into consideration my barrel slugs at .358”. I didn’t measure the 180 grain hard-cores. The the 200 grain hornady was .357”, the 250 grain hornady spire point was .357”, the Norma .250 grain were .3565”, and the 220 speer were .358”. I remember years ago the 180 grain speer were .3595” to .362”. They were sent back in and Speer replaced them because they were splitting my case necks when I was trying to seat them. But I wish I would’ve held onto those babies now! Powder coating and resizing. I have them all at .3595”. I took My gun out yesterday to test. First group of three with a .3595” 220 hot core I only hit my target once! I was 14 inches to the right and a hair high. The other Two missed completely. I knew something was wrong because I was out a few days earlier and was basically an inch or too high and 100 yards. Upon inspection, I saw that my pump was resting against the barrel, sitting in my lead sled. When I picked the gun up out of the sled the pump fell forward and I saw the magazine tube move as well! I came loose again. So I took it home, disassembled it in degreased the threads for the tube and inside the tube. I then put a super generous coat of blue Loctite on it. This is either the second or third time that that tube has come loose. The screw that holds the pump forehand on was also loose again. I degreased the bolt in the threads and made sure to put plenty of blue Loctite on that as well. I noticed when I reassembled the pump that when I moved it around because there’s a little bit of flex/slop with the design of pump slides the pump was touching the barrel on the left. Like it was off-center versus the barrel. I then decided to say the inside of the channel a couple of times and then refinish the inside with true oil. I installed it back with plenty of clearance when checking. Took it back apart to put true oil on it and then reinstalled it to find out it was touching the barrel again. I had my buddy who was a gunsmith on the phone at the time who is one of my best friends, and we were just shooting the breeze about other subjects. He asked what I was doing. I told him that that pump was touching the barrel. He told me to take one hand and twist the pump in the opposite direction that it was touching and then tightened down the bolt. Well, I’ll be darn. It worked because there is plenty of clearance on both sides now of the pump. So hopefully the magazine tube will stay put now so the barrel doesn’t loosen up and also the screw that holds the fore pump stays tight so the pump does not touch the barrel. I’m sure it will help with my current groups from the last week by far. It’s not gonna fix the over bored barrel but I’m sure it will at least get me back down to one and a half inch groups with factory ammo. I better load up a few more loads to recheck my zero cause. I’m sure it probably is not zeroed after that fiasco. Anybody else had barrels that keep coming loose on 7600s. If so, any ideas how to keep it in place? I’ve probably owned a dozen of these pumps over the years and their tack drivers. I have some that that would Cloverleaf at 100 yards. Has given me nothing but problems from day one. I have taken my barrels off my other guns and put back on and never had the pump tube. Come loose afterwards. Maybe this gun just vibrates too much from the healthy recoil of the big 35?
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Originally Posted by Texas by God
