![]() ![]() The most aggravating part was having to cut off that extra 1/4 inch. The cases were a little heavier then those made from 300 WM cases. I used 14 grains of RedDot with a cotton wad to blow them out then fired with full charge loads. They had a lot of body taper to blow out and 0.250 to cut off. They came out 0.020 shorter then 2.620 standard 300 WM cases.Ī couple of years ago, probably more like 4 years ago, 300 WM brass got hard to find so bought a bag of Remington 375 H&H to try. I went with a 30º shoulder then let the neck length shorten when necked up to 375. My 375 wildcat is based on the 300 WM case and up to the shoulder break is 300 WM. It is tedious to do correctly, is time consuming and one of my least favorite case prep operations. Neck turning is not difficult but requires another couple of tools. If after reforming you find the neck wall thickness is too great, the necks can be turned down. Of course you can anneal the neck and shoulder prior to sizing down to help in the sizing operation and to delay the effects of work hardening. That difference will be an approximation of total clearance. ![]() 001" for brass shrink back after firing- that is about the diameter of the rifle's chamber neck. Also, any excessive sizing will work harden the brass in the neck and can shorten useful life of the case.Īn easy check for chamber neck clearance- Measure the neck diameter of a fired round, preferably one that has been fired a few times and/or with a full pressure load. It only takes one out of a batch!! and not all brass thicknesses are uniformly equal within a batch. Too little can drastically increase pressure. 004"-.008" in the range of average or normal for chambers designed for reliable hunting or tactical applications. ![]() The critical thing, however is that the loaded round have enough clearance between the neck and chamber wall for "easy" bullet release upon firing. and that number can be compared to regular, new factory brass. neck wall thickness can be checked with a ball mic. ![]()
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