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Rifles, Reloading, Optics, Equipment
Reloading
New to reloading question.
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<blockquote data-quote="greenejc" data-source="post: 1724617" data-attributes="member: 60453"><p>Actually, the books are quite useful. Most of them will publish either the Pizo-electric pressure average generated by a load or the average Copper Units of Pressure generated by a load. An example would be the Hodgden's manual 2019 Annual (I get one every year) showing a maximum load of BLC(2) of 47.5gr. with a Hornady SP 165 grain bullet, using Winchester LR primers, and Winchester casings, generating 49,700 CUP average. SAAMI lists this round's MAP as 52,000 CUP or 62,000 PSI. The manual(s) also note (all of them) that changing bullet brands/types, primer brands or casing manufacturers changes pressure results, which is why one starts at least 2.5 grains under the max charge when one does this. Please note, this is the powder manufacturer who is putting out the pressure information, and Hodgdon's has much better equipment for determining safe loads and measuring average pressures than nearly all of us do. If Hornaday limited a charge with its propriatory bullet, believe me Hornaday has good reason to do it. Also keep in mind that not all 165 grain bullets are equal where pressure generation is concerned. Barnes bullets generally have a separate section in the Lyman, Lee and Hodgden manuals. That's because they have a longer shank and are a mono bullet. They generate higher pressures due to having a larger area in contact with the bore of the rifle. The books are made by people who have the equipment to test the loads and see what is within a margin of safety for your cartridge. They're trying to keep you from being called nine-finger or one-eye. They may be overly careful with some loads, but they're mostly giving data that's very close to SAAMI maximums, and you should heed them. Rifles are expensive to replace, and fingers, arms and eyes can't be at this time. And your load is fine so go shoot it.</p></blockquote><p></p>
[QUOTE="greenejc, post: 1724617, member: 60453"] Actually, the books are quite useful. Most of them will publish either the Pizo-electric pressure average generated by a load or the average Copper Units of Pressure generated by a load. An example would be the Hodgden's manual 2019 Annual (I get one every year) showing a maximum load of BLC(2) of 47.5gr. with a Hornady SP 165 grain bullet, using Winchester LR primers, and Winchester casings, generating 49,700 CUP average. SAAMI lists this round's MAP as 52,000 CUP or 62,000 PSI. The manual(s) also note (all of them) that changing bullet brands/types, primer brands or casing manufacturers changes pressure results, which is why one starts at least 2.5 grains under the max charge when one does this. Please note, this is the powder manufacturer who is putting out the pressure information, and Hodgdon's has much better equipment for determining safe loads and measuring average pressures than nearly all of us do. If Hornaday limited a charge with its propriatory bullet, believe me Hornaday has good reason to do it. Also keep in mind that not all 165 grain bullets are equal where pressure generation is concerned. Barnes bullets generally have a separate section in the Lyman, Lee and Hodgden manuals. That's because they have a longer shank and are a mono bullet. They generate higher pressures due to having a larger area in contact with the bore of the rifle. The books are made by people who have the equipment to test the loads and see what is within a margin of safety for your cartridge. They're trying to keep you from being called nine-finger or one-eye. They may be overly careful with some loads, but they're mostly giving data that's very close to SAAMI maximums, and you should heed them. Rifles are expensive to replace, and fingers, arms and eyes can't be at this time. And your load is fine so go shoot it. [/QUOTE]
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