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Rifles, Reloading, Optics, Equipment
Reloading
.375 H&H 300g bullets best velocity
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<blockquote data-quote="benchracer" data-source="post: 771437" data-attributes="member: 22069"><p>I started load development today. I only did a short workup to establish my max load, using Hodgdon book data, 300g Hornady Interlock BTSP's and H4350. </p><p> </p><p>The Hodgdon data specified a COAL of 3.6", a starting charge of 77g, a max charge of 81.5g (compressed), and a max velocity of 2645 from a 24" barrel.</p><p> </p><p>With the Hornady bullet, COAL to the rifling is 3.830. I backed the bullet off to 3.750 and began one grain above min, loading one round at 78.0g, 79.0g, 80.0g, 81.0g respectively and two rounds at 81.5g. All rounds were capable of being fed from the magazine of my rifle.</p><p> </p><p>The first round crossed the chrono @ 2640 and the last two rounds chronoed 2718 and 2722 respectively. The brass showed no signs of pressure, primers looked good, bolt lift was normal, and the recoil was manageable from the standing position.</p><p> </p><p>With the CE bullets, I initially followed the factory recommendation for seating depth of trim length +1.141", but the seal tite band ended up being seated below the case mouth at this length. Though CE states that it is acceptable for the seal tite band to be seated in the case neck, I decided that I would prefer to have the seal tite band seated just above the case mouth. Seated in that manner, my COAL was 4.004. These loads allowed one round to be placed in the magazine and a second round to be fed into the chamber over the top of the first round.</p><p> </p><p>I loaded one round each at 77.0g, 78.0g, 79.0g, 80.0g, 81.0g, and 81.5g of H4350 respectively. The first round chronoed 2647 and the last round chronoed 2766. As with the first set of rounds, there were no indications of high pressure of any kind. </p><p> </p><p>I am convinced that I could go faster with both loads before reaching max, but I am very happy with the results I've gotten so far. I don't feel the need to push pressures to maximum. </p><p> </p><p>I am also very happy with H4350 so far. The velocity increases between rounds were very predictable and it looks to me like it will produce very consistent loads. I don't intend to experiment with another powder unless I am unable to get acceptable accuracy with this one.</p><p> </p><p>IMO, it was also noteworthy that the CE bullets behaved very similarly to the conventional Hornady bullets in terms of pressure tolerance and velocity. That indicates to me that one can safely use data for same weight conventional bullets and listed powders with the CE bullets.</p><p> </p><p>Now for the next stage of development-- accuracy testing using an OCW ladder. I will post my results with photos in a new thread.</p></blockquote><p></p>
[QUOTE="benchracer, post: 771437, member: 22069"] I started load development today. I only did a short workup to establish my max load, using Hodgdon book data, 300g Hornady Interlock BTSP's and H4350. The Hodgdon data specified a COAL of 3.6", a starting charge of 77g, a max charge of 81.5g (compressed), and a max velocity of 2645 from a 24" barrel. With the Hornady bullet, COAL to the rifling is 3.830. I backed the bullet off to 3.750 and began one grain above min, loading one round at 78.0g, 79.0g, 80.0g, 81.0g respectively and two rounds at 81.5g. All rounds were capable of being fed from the magazine of my rifle. The first round crossed the chrono @ 2640 and the last two rounds chronoed 2718 and 2722 respectively. The brass showed no signs of pressure, primers looked good, bolt lift was normal, and the recoil was manageable from the standing position. With the CE bullets, I initially followed the factory recommendation for seating depth of trim length +1.141", but the seal tite band ended up being seated below the case mouth at this length. Though CE states that it is acceptable for the seal tite band to be seated in the case neck, I decided that I would prefer to have the seal tite band seated just above the case mouth. Seated in that manner, my COAL was 4.004. These loads allowed one round to be placed in the magazine and a second round to be fed into the chamber over the top of the first round. I loaded one round each at 77.0g, 78.0g, 79.0g, 80.0g, 81.0g, and 81.5g of H4350 respectively. The first round chronoed 2647 and the last round chronoed 2766. As with the first set of rounds, there were no indications of high pressure of any kind. I am convinced that I could go faster with both loads before reaching max, but I am very happy with the results I've gotten so far. I don't feel the need to push pressures to maximum. I am also very happy with H4350 so far. The velocity increases between rounds were very predictable and it looks to me like it will produce very consistent loads. I don't intend to experiment with another powder unless I am unable to get acceptable accuracy with this one. IMO, it was also noteworthy that the CE bullets behaved very similarly to the conventional Hornady bullets in terms of pressure tolerance and velocity. That indicates to me that one can safely use data for same weight conventional bullets and listed powders with the CE bullets. Now for the next stage of development-- accuracy testing using an OCW ladder. I will post my results with photos in a new thread. [/QUOTE]
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