Hi Everyone,
I wasn't quite sure where to post this, but here it is. Keyholing issue. I am using a Lyman 311466 mold. This mold, for whatever reason drops boolits at .315-.316. What I am doing is working on a load for my 303 Brit. I decided to try some tumbled lubed with 45/45/10, and some powder coated. My starting load is 13 grains of Unique. My 303, as best I can tell slugs at .315. ( it's a 5 groove, so kinda hard to be real accurate) I decided to try some tumble lubed as cast and seated a gas check. I powder coated some and gas checked and sized them to .314. ( it was the closest size I had) After firing them at 25 yards, on separate targets, 10 rounds each, six of the tumble lubed boolits went through the target sideways. All ten of the powder coated boolits were normal, and grouped quite well. So it seems, why worry, just bake them and shoot them, right? Probably will. But I'm just trying to figure out what may have caused the t/l boolits to perform so erratically? Thanks in advance for giving this a look, and any thoughts on the matter.