Here mine in 7x57. I've talked about this piece before in various threads and it's surely a finicky rig. Like others have said, when that barrel heats up, weird things can happen. Some bullets simply do not work well, but then something similar will cut out a colverleaf on a good day. I just never know so I keep experimenting - that's part of the fun. When everything comes together though for those RSIs, it's all worth it! I probably have 1/2 dozen loads now that I would consider very nice. If I stop being so hard on myself and accept the fact that 1 1/2" groups are good enough, you can probably call that an even dozen good loads.

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