clover leafing at 200 yds is great shooting, what 7mm??? your 600 yd group is very good yes it can always be better for us all, but thats not always possible. i shoot a disk blade but mines turned around. still great fun cause the bullets liquify and smoke gray.
another forum member asked how close you could shoot one, my disk shooting starts at 300 yds,closer and the bullet will pass through, even edge hits can cause holes the thinner metal can only take so much,
yes smaller
calibers and the disk can be moved closer,saftey 1st, its a great training tool for long range, cause it build's Confidence after all thats what we're after.
regards jjmp