Some time ago a poster mentioned they placed acetal round balls inside the hollow base of their foster slug reloads. I have had problems with the bases of forster slugs collapsing under the force of firing. I have tried filling the bases with hot glue, with only limited success, so I thought I would give the acetal balls a try. I have read that Federal has had good success with this idea in their "True Ball" slug ammo. What size balls did you use, and where did you get them? I have the Lyman 12ga forster and Rapine 550gr Flying trash can foster molds. The websites I have looked on don't give much choice in sizes. It seems that 1/2" is the closest size available that could fit, @ $15 per hundred. 3/4" would be the next size up, which is too big.
Anyone who has had experience with using the acetal balls I would appreciate hearing from.