which wad?

[Martini2]

Like to add that using cork material wads can be detrimental in some cases. I just finished a shootin session this AM where a load for my 38-55 had been altered. The design was to lower powder amount used a bit and in hast a 1/8" thick wad was added to fill space. At bench first a load using just fiber OP wad was used to tune sights in. Then we switched to new load (with cork added). The impacts were being plotted so the first 2 recorded were close in to previous group (200 yds).
Then as shooting load with cork wad added proceeded the plotted impacts began to spread. Examining bore it appears the added cork wads were so effective at sealing they stripped the bore of lube. After no more than 4 rounds it was like EACH round was a cold/dry bore shot. Fortunately the target was a center stapled in middle of 3 ft X 3 ft. backer or the wild impacts would not have been recorded at all. I guess there will be nothing for it but to burn up these loads at Off Hand practice at very short range. I can use a good 'Ah explanation' for my poor shootin on hide paws