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Hunting
Long Range Hunting & Shooting
Blocked bolt with reloaded ammo
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<blockquote data-quote="hangfire" data-source="post: 1629300" data-attributes="member: 41588"><p>Pressure is dictated by a number of factors, charge weight, internal case capacity, overall length of cartridge, bullet weight and bore dimensions, a change in any one of these will effect pressure. PPU brass as people have said tends to have a lower internal capacity then most other brands. As has been mentioned before the relationship of the bullet ogive to the rifle lands has more effect on accuracy then charge weight. When I'm developing a load I find the lands, load 3 rounds to that dimension then three rounds 10 thou shorter and carry on till 70 thou off the lands. I choose a load that will be under pressure at the shortest dimension. presuming I obtain an acceptable group from one of these loads I will then play with powder charges. I have sometimes had to load 120 thou of the lands to get a decent group. I once owned two Rem 700's in .308 and using the same batch of brass, powder and the same bullets had a difference of 1 grain of powder in max pressure between the two rifles</p></blockquote><p></p>
[QUOTE="hangfire, post: 1629300, member: 41588"] Pressure is dictated by a number of factors, charge weight, internal case capacity, overall length of cartridge, bullet weight and bore dimensions, a change in any one of these will effect pressure. PPU brass as people have said tends to have a lower internal capacity then most other brands. As has been mentioned before the relationship of the bullet ogive to the rifle lands has more effect on accuracy then charge weight. When I'm developing a load I find the lands, load 3 rounds to that dimension then three rounds 10 thou shorter and carry on till 70 thou off the lands. I choose a load that will be under pressure at the shortest dimension. presuming I obtain an acceptable group from one of these loads I will then play with powder charges. I have sometimes had to load 120 thou of the lands to get a decent group. I once owned two Rem 700's in .308 and using the same batch of brass, powder and the same bullets had a difference of 1 grain of powder in max pressure between the two rifles [/QUOTE]
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Blocked bolt with reloaded ammo
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