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Rifles, Reloading, Optics, Equipment
Reloading
H1000 old lot vs new lot.
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<blockquote data-quote="entoptics" data-source="post: 2535049" data-attributes="member: 104268"><p>Thought I'd throw this out there as a friendly reminder, as well as some actual data to demonstrate what most of us already know.</p><p></p><p>Got 5 lbs of H1000 a couple months ago, and finally got out to test it against the remainders of an 8lb jug I bought a couple years ago.</p><p></p><p>Used the exact same 264 Win Mag load for both, loaded together in one session, and shot together in the same gun/session...</p><p></p><p>60.99 grains</p><p>129 gr SST</p><p>Fire forming new Winchester brass, bullet jammed ~0.020</p><p></p><p>New Lot</p><p>2965 fps</p><p></p><p>Old lot</p><p>3049 fps</p><p></p><p>That's an 84 fps difference, or 2.8%. That equates to 1.7 grains more of the new lot of powder to achieve the same velocity as the old lot.</p><p></p><p>Pretty significant IMO. Probably at least partially a result of the old batch having sat around, been opened over and over, and potentially having lost a little volatile weight.</p><p></p><p>Gonna go ahead and mix the old and new together in the 8lb jug, and of course, rework any H1000 loads going forward.</p><p></p><p>Anyway, just a little reminder to never take anything for granted. With that sorta variation possible, it's not hard to see how a load could go out of tune. Perhaps more importantly, if you're like me and run up near the top end, you could find unwanted primers in your action just from switching lots. It's one of the reasons why load manuals say "drop it down X% and work up". It's also not uncommon for a lot of powder to change over time, even when stored properly, so I always monitor velocity and pressure through the course of a big jug, and adjust accordingly.</p></blockquote><p></p>
[QUOTE="entoptics, post: 2535049, member: 104268"] Thought I'd throw this out there as a friendly reminder, as well as some actual data to demonstrate what most of us already know. Got 5 lbs of H1000 a couple months ago, and finally got out to test it against the remainders of an 8lb jug I bought a couple years ago. Used the exact same 264 Win Mag load for both, loaded together in one session, and shot together in the same gun/session... 60.99 grains 129 gr SST Fire forming new Winchester brass, bullet jammed ~0.020 New Lot 2965 fps Old lot 3049 fps That's an 84 fps difference, or 2.8%. That equates to 1.7 grains more of the new lot of powder to achieve the same velocity as the old lot. Pretty significant IMO. Probably at least partially a result of the old batch having sat around, been opened over and over, and potentially having lost a little volatile weight. Gonna go ahead and mix the old and new together in the 8lb jug, and of course, rework any H1000 loads going forward. Anyway, just a little reminder to never take anything for granted. With that sorta variation possible, it's not hard to see how a load could go out of tune. Perhaps more importantly, if you're like me and run up near the top end, you could find unwanted primers in your action just from switching lots. It's one of the reasons why load manuals say "drop it down X% and work up". It's also not uncommon for a lot of powder to change over time, even when stored properly, so I always monitor velocity and pressure through the course of a big jug, and adjust accordingly. [/QUOTE]
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H1000 old lot vs new lot.
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