I just cast my first bullets in over 20 years. Some of the ugliest bullets I've ever cast. Just couldn't seem to get my temps regulated.... Recycled a lot. But, of the ones I kept, I weighed about 20 or so. Of a cast bullet at around 420 grains, what is an acceptable variance in grains, to give decent 100 yard accuracy in a 45-70 Marlin Guide Gun. I had an extreme of 3.0 grains, but most feel inside of about 1.5 to 1.8 grains. Thanks, memtb