Yes sir, I made many and all of them are self taught, earlier in the year bought a new rifle and scope got everything put together with some hand loaded ammo went to the range to sight in, sighted in pretty quick. In weeks after that while working up loads for this new gun which was grouping pretty good just all of a sudden throwing rounds all over the target, went back checking the rounds,loaded more rounds went back to the range it’s getting worse as I shoot. I leave even more disgusted, get home thinking of all kinds of possibilities , decide to change the scope with an older one and I was reinstalling the scope I bumped the base mount. It rattled!! Dumm dumm did not check the base mount that was already installed from the factory. I just always mounted my own base mount and never thought to check this one.