The rule of thumb with TSS is, if you take your average 40 yd 10" count, you can figure your count in 10 yard increments farther, simply by multiplying by .7.

So, say my 40 yd count is 283, then 283 x .7 = 198 to get my 50 yd count. Then multiply 198 x .7 to get your 60 yd count = 139, etc.

You can see it works out pretty close with my acutal patterns above.