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Rifles, Reloading, Optics, Equipment
Reloading
308 Load info
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<blockquote data-quote="Bart B" data-source="post: 605597" data-attributes="member: 5302"><p>Well, I overlookd that.</p><p></p><p>IMR4064 was probably the most used powder in the .308 Win. for bullets from 168 through 190 grains when that round was "the" one to use in high power competion. Won more matches and set more records than all other powders combined as far as I know.</p><p></p><p>That aside, lighter bullets typically fare better accuracy wise with faster powders. I was one of a handful of high master classified high power shooters developing a load for Sierra's then new 155-gr. Palma bullet in 1991. 20-shot test groups were the norm at 1000 yards. We tried all sorts of powders a bit faster than IMR4064 but settled on 45.3 grains of IMR4895. Randomly picking 20 rounds loaded on two Dillon 1050 progressives with new cases and metered (not weighed) powder charges put 20 of 'em inside 2.8 inches at 600 yards. In the first match that bullet was used in, some folks had loaded IMR4064; none of them did very well.</p><p></p><p>Later, Varget came out and it is a bit better and the powder of choice for most folks winning Palma matches at 800 through 1000 yards these days.</p><p></p><p>One thing about load development, I suggest shooting at least 15 shots per test group and calculate mean radius from group center. 5-shots extreme spread measurements give only a 50% or less probability of representing how all rounds fired with that load will perform. 15-shot groups' mean radius raises that probability up to 80% or more. Check out this web site:</p><p></p><p><a href="http://fuzzylimey.net/coachtalk/groupanal.html" target="_blank">http://fuzzylimey.net/coachtalk/groupanal.html</a></p></blockquote><p></p>
[QUOTE="Bart B, post: 605597, member: 5302"] Well, I overlookd that. IMR4064 was probably the most used powder in the .308 Win. for bullets from 168 through 190 grains when that round was "the" one to use in high power competion. Won more matches and set more records than all other powders combined as far as I know. That aside, lighter bullets typically fare better accuracy wise with faster powders. I was one of a handful of high master classified high power shooters developing a load for Sierra's then new 155-gr. Palma bullet in 1991. 20-shot test groups were the norm at 1000 yards. We tried all sorts of powders a bit faster than IMR4064 but settled on 45.3 grains of IMR4895. Randomly picking 20 rounds loaded on two Dillon 1050 progressives with new cases and metered (not weighed) powder charges put 20 of 'em inside 2.8 inches at 600 yards. In the first match that bullet was used in, some folks had loaded IMR4064; none of them did very well. Later, Varget came out and it is a bit better and the powder of choice for most folks winning Palma matches at 800 through 1000 yards these days. One thing about load development, I suggest shooting at least 15 shots per test group and calculate mean radius from group center. 5-shots extreme spread measurements give only a 50% or less probability of representing how all rounds fired with that load will perform. 15-shot groups' mean radius raises that probability up to 80% or more. Check out this web site: [url]http://fuzzylimey.net/coachtalk/groupanal.html[/url] [/QUOTE]
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