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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Best bullet weight for 280 Ackley improved with 22 inch barrel
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<blockquote data-quote="RockyMtnMT" data-source="post: 1890887" data-attributes="member: 7999"><p>Not familiar with Talley. Yes as a general rule all copper bullets have had issues with pressure. Barnes is the granddaddy of mono's. Their original bullet was a smooth baring surface. They shot great in some rifles and some rifles would build too high of pressure and others would have accuracy trouble. The age old question is how big in dia to make a copper bullet so that it will seal the bore but not make too much pressure. There is tolerance in bore/groove dia making some tighter or looser than spec. They made a change to the bullets by putting in grooves to eliminate some of the baring surface and relieve the pressure issues. Copper is harder than lead so it can't obturate to conform to the bore size like lead will. Lead will squeeze down in tight rifles and plump up in loose bores from the pressure of the charge behind it. So in loose bores the typical copper bullets will have trouble with accuracy as it rattles down the bore and over pressure in tight bores, and shoot great in the rest. Drive band bullets handle this better than grooved bullets but still have the issue. We solved this by making our drive bands on a radius so that the outside dia of the drive bands are very finite in actual material contact in the grooves. This allows us to cut our bullets larger in dia than caliber without creating extra pressure in tight bores yet still seal up on the loose bores. Hammer Bullets will show less pressure than conventional lead core bullets of the same weight and quite a bit less than most copper bullets.</p></blockquote><p></p>
[QUOTE="RockyMtnMT, post: 1890887, member: 7999"] Not familiar with Talley. Yes as a general rule all copper bullets have had issues with pressure. Barnes is the granddaddy of mono's. Their original bullet was a smooth baring surface. They shot great in some rifles and some rifles would build too high of pressure and others would have accuracy trouble. The age old question is how big in dia to make a copper bullet so that it will seal the bore but not make too much pressure. There is tolerance in bore/groove dia making some tighter or looser than spec. They made a change to the bullets by putting in grooves to eliminate some of the baring surface and relieve the pressure issues. Copper is harder than lead so it can't obturate to conform to the bore size like lead will. Lead will squeeze down in tight rifles and plump up in loose bores from the pressure of the charge behind it. So in loose bores the typical copper bullets will have trouble with accuracy as it rattles down the bore and over pressure in tight bores, and shoot great in the rest. Drive band bullets handle this better than grooved bullets but still have the issue. We solved this by making our drive bands on a radius so that the outside dia of the drive bands are very finite in actual material contact in the grooves. This allows us to cut our bullets larger in dia than caliber without creating extra pressure in tight bores yet still seal up on the loose bores. Hammer Bullets will show less pressure than conventional lead core bullets of the same weight and quite a bit less than most copper bullets. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Best bullet weight for 280 Ackley improved with 22 inch barrel
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