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Rifles, Reloading, Optics, Equipment
Reloading
Am I about to blow my face off?
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<blockquote data-quote="jarnold37" data-source="post: 2120289" data-attributes="member: 29241"><p>I have come to the conclusion after many years of reloading that the loading manuals are just a guide line. Some rifles of the same cartridge and barrel can produce different chamber pressures even with exact same load. Many causes for this. Difference in bore diameter, loose or tight chamber, brass hardness or elasticity powder inconsistency and many other variables. I have noticed that almost all of the dozens of best loads for certain gun was not a full case up to the neck. So extra case capacity, by moving the bullet closer to the lands to allow a grain or two more powder made little or no difference in pressure and accuracy. Most of my best loads have been with the bullet either touching or just off ten thousands. Bigger bullets that had the boat tail below the neck shoulder junction did not cause a loss in velocity as seldom had a full case of powder. In the rare instance there was more room needed then a faster burn rate powder was used. Dont think that you have to have a full case of powder. Determine best bullet seating distance from lands and adjust pressure with different burn rate and amount of powder. If your choice of bullet extends deeper into powder area preventing enough powder, the small amount of extra powder space gained by moving bullet out 50 thousands or so will make little if any difference. I order reamers not to cut long throat to "gain" extra powder space but to have the particular bullet touching the riflings with the pressure ring of the bullet very close to the bottom of the neck. If using a bigger bullet which extends deeper than bottom of neck, less powder is needed.</p></blockquote><p></p>
[QUOTE="jarnold37, post: 2120289, member: 29241"] I have come to the conclusion after many years of reloading that the loading manuals are just a guide line. Some rifles of the same cartridge and barrel can produce different chamber pressures even with exact same load. Many causes for this. Difference in bore diameter, loose or tight chamber, brass hardness or elasticity powder inconsistency and many other variables. I have noticed that almost all of the dozens of best loads for certain gun was not a full case up to the neck. So extra case capacity, by moving the bullet closer to the lands to allow a grain or two more powder made little or no difference in pressure and accuracy. Most of my best loads have been with the bullet either touching or just off ten thousands. Bigger bullets that had the boat tail below the neck shoulder junction did not cause a loss in velocity as seldom had a full case of powder. In the rare instance there was more room needed then a faster burn rate powder was used. Dont think that you have to have a full case of powder. Determine best bullet seating distance from lands and adjust pressure with different burn rate and amount of powder. If your choice of bullet extends deeper into powder area preventing enough powder, the small amount of extra powder space gained by moving bullet out 50 thousands or so will make little if any difference. I order reamers not to cut long throat to "gain" extra powder space but to have the particular bullet touching the riflings with the pressure ring of the bullet very close to the bottom of the neck. If using a bigger bullet which extends deeper than bottom of neck, less powder is needed. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Am I about to blow my face off?
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