Don I envy you guys that can test at those extended ranges. That's only something I can do shooting a match.

You guys with the long test ranges should develop loads that hold thew X ring and not stray past the 10 ring at every match. LOL.
With my Bryan build .44-77 light barreled Hartford with their standard chamber and 19 twist I shot the 50 small bullets you gave me and they shot very good here at home and my adjustable mould casts almost an identical profiled bullet like it I have set it below 1.3" around 400 gr and they also shot very good at 200 with the Hartford .44-77 but the 1.3 would not hold the Q buffalo when I took the best I that shot well here at home. The 1.330 .486 gr all held good on that 805 buff at the Q as well as the 3.25. In that 19 twist I have not found anything that will outperform the 1.325" out at the Q or the 1226 target at Baker. And you know what the breezes are like at those two ranges.
As far as the thick or thin paper I use both. But I only use the thin in the .40 cal. .40-65 and .45-90 Douglas barrels with the .003" deep grooves I ordered. I know two guys that use printer paper and I wouldn't stand in front of the target at a 1000 yards with them shooting those wrapped bullets in there .45-70.

Hey It's all in fun past time doing this till the matches start up again. And I want to leave behind something that works and don't work in my particular rifles for future reference.