Vertical stringing cause?

[daveboy]

When I purchased this 1899 carbine a decade or so ago, it would group about 36" at 25 yards! And, those were keyholed! It also looked like about as well as it shot. I've done a lot of work on her, tailored some cast loads, and I am now keeping it within 6" at 100 yards. However, as you can see, it appears to be stringing vertically as the barrel warms. The first two rounds, touch, then it goes upward. I'm guessing I have some kind of stock issue. This is not the stock that came with the weapon. Instead, it is a cut-down rifle stock, but one that was very well done back in the day. Definitely not a bubba job. After I shot this group, I checked the action screws. They were snug, but not tight. I got about five more degrees of twist into them simply using a screwdriver in my hand. I'm going to try again soon, to see if those slightly loose screws are the problem. If not, where should I look?

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