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Rifles, Reloading, Optics, Equipment
Reloading
procedure for measuring case volume
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<blockquote data-quote="Bart B" data-source="post: 636016" data-attributes="member: 5302"><p>I've no idea where Hart got the material to make their barrels from. Four of 'em went through the same 200 WCC58 match .308 cases loaded with max charges of IMR4064 under Sierra 190's for about 1000 rounds per barrel. The other 2000 or so rounds of barrel life each was with 400 Federal nickel plated .308 cases with 41 grains of IMR4064 under Sierra 168's. All 600 cases were full length sized about 20 times. The chambers were all made with SAAMI spec'd reamers.</p><p></p><p>I didn't notice any change in accuracy for the life of each barrel. They all started out at the same accuracy level but the last 20 to 30 percent of the barrel life seemed a tiny bit less. Elevation and windage sight zeros stayed the same for each range, too. The only exception was very near the end of accurate barrel life, I had to increase elevation 3/4 to 1 MOA at the longer ranges. The throats were lengthened somewhat by then and muzzle velocity was noticably a smidgen less, evidenced by needing more sight elevation to strike point of aim.</p></blockquote><p></p>
[QUOTE="Bart B, post: 636016, member: 5302"] I've no idea where Hart got the material to make their barrels from. Four of 'em went through the same 200 WCC58 match .308 cases loaded with max charges of IMR4064 under Sierra 190's for about 1000 rounds per barrel. The other 2000 or so rounds of barrel life each was with 400 Federal nickel plated .308 cases with 41 grains of IMR4064 under Sierra 168's. All 600 cases were full length sized about 20 times. The chambers were all made with SAAMI spec'd reamers. I didn't notice any change in accuracy for the life of each barrel. They all started out at the same accuracy level but the last 20 to 30 percent of the barrel life seemed a tiny bit less. Elevation and windage sight zeros stayed the same for each range, too. The only exception was very near the end of accurate barrel life, I had to increase elevation 3/4 to 1 MOA at the longer ranges. The throats were lengthened somewhat by then and muzzle velocity was noticably a smidgen less, evidenced by needing more sight elevation to strike point of aim. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
procedure for measuring case volume
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