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Rifles, Reloading, Optics, Equipment
Reloading
7mm rem mag new brass vs fireformed capicity help
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<blockquote data-quote="FURMAN" data-source="post: 1483472" data-attributes="member: 26535"><p>This is NOT true. Every single rifle I have developed a load for with new brass only needs a powder adjustment to obtain the same velocity as the load with new brass. Depending on the cartridge this is usually around .5-1.0grains lower(usually on the lower side) with magnum cartridges. An example is my first 30 nosler with new brass the load was 80.5 grains of Retumbo with a 215 Berger. Once fired brass took 79.9 to get to the accuracy node at 3030fps. The thing you do have to worry about is if you do not find the load with new brass and then try to continue development with fired brass you could be chasing your tail. I think Mikecr is suggestion doing seating depth testing while "fire forming" your brass which could help keep things consistent once you start powder charge changes. The problem with that is I have, on several occasions, found that a particular bullet may have different seating depth preferences in the same rifle depending on powder charge. What I usually do is start with a Ladder with bullets seated at the lands. I will usually find the accuracy node within 20 rounds. You can then tweak seating depth and note the velocity of the accuracy node. Once you move to fired cases check velocity and reduce powder charge accordingly. So to answer your question get the velocity of your accuracy load and adjust back to it once your new brass is all fired.</p></blockquote><p></p>
[QUOTE="FURMAN, post: 1483472, member: 26535"] This is NOT true. Every single rifle I have developed a load for with new brass only needs a powder adjustment to obtain the same velocity as the load with new brass. Depending on the cartridge this is usually around .5-1.0grains lower(usually on the lower side) with magnum cartridges. An example is my first 30 nosler with new brass the load was 80.5 grains of Retumbo with a 215 Berger. Once fired brass took 79.9 to get to the accuracy node at 3030fps. The thing you do have to worry about is if you do not find the load with new brass and then try to continue development with fired brass you could be chasing your tail. I think Mikecr is suggestion doing seating depth testing while "fire forming" your brass which could help keep things consistent once you start powder charge changes. The problem with that is I have, on several occasions, found that a particular bullet may have different seating depth preferences in the same rifle depending on powder charge. What I usually do is start with a Ladder with bullets seated at the lands. I will usually find the accuracy node within 20 rounds. You can then tweak seating depth and note the velocity of the accuracy node. Once you move to fired cases check velocity and reduce powder charge accordingly. So to answer your question get the velocity of your accuracy load and adjust back to it once your new brass is all fired. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
7mm rem mag new brass vs fireformed capicity help
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