I have been playing with this 375 Taylor (338 win mag necked up) for a few years now, and am finally getting really good consistent results with paper patch ammo. I started with a chamber having a "modern accuracy" type throat, i.e. .3755" parallel section into 1 1/2 deg. taper. I found that while it was a tack driver with jacketed bullets it was too hard to get paper patch to work right. It would leave paper rings at the mouth of the case and I had to size the bullets too small. So I rechambered it with a throater I had Dave Manson make me that has no step at the mouth of the case, just a 7 deg. cone into a 1 deg. throat. That made it work way better for paper, they chamber easily and don't cut paper off any more. Accuracy improved a bit but it still threw fliers at high speed. The I started trying fillers - Cream 'O' Wheat and also BPI shot buffer along with faster powders. Now I'm getting somewhere! Yesterday I was shooting the 248gr. Lyman 38-55 plainbase bullet, cast from air cooled wheelweights, at 2500 fps into 2 MOA groups using IMR 3031. Not benchrest accurate, but plenty good to shoot an elk and the best thing was no wild fliers at all! And pretty much the full power that this case is capable of at reasonable pressure. Looks like I am on the right track and it's starting to get more fun now!
