I decided that since I won't be shooting my 375 Win as much with heavy loads as I will lighter ones that a plain base mould made sense.
I ordered a 5 cav NOE 379449 PB mould. Got it cleaned, lubed, and cast a hundred or so. I later went and file a very slight bevel on the inner top edge of the blocks, I was getting too many slightly rounded bases.
You can see the one on the left has a slight rounding to the base. The one on the right is nice and sharp. The middle one has an almost perfect base but has a sight crescent that didn't fill ot as it should. This is usually a sign that the mould needs a bit better venting. A very slight bevel on the upper inside corner of the blocks allows that venting.
They drop at .380 and will easily size to .379 for the rifle. I think that as long as I keep them under 1400 fps there will be no leading or accuracy problems.
I ordered a 5 cav NOE 379449 PB mould. Got it cleaned, lubed, and cast a hundred or so. I later went and file a very slight bevel on the inner top edge of the blocks, I was getting too many slightly rounded bases.
You can see the one on the left has a slight rounding to the base. The one on the right is nice and sharp. The middle one has an almost perfect base but has a sight crescent that didn't fill ot as it should. This is usually a sign that the mould needs a bit better venting. A very slight bevel on the upper inside corner of the blocks allows that venting.
They drop at .380 and will easily size to .379 for the rifle. I think that as long as I keep them under 1400 fps there will be no leading or accuracy problems.