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Rifles, Reloading, Optics, Equipment
Reloading
IMR or H4831 in 300 wby?
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<blockquote data-quote="rg1" data-source="post: 526112" data-attributes="member: 11927"><p>I too have read that RL 22 can be inconsistent but what I've seen said is that others have seen variations between lots but haven't seen mentioned that the same lot number varies except some difference between hot summer and cold weather.</p><p> I've used 3 different lots of Norma MRP, the equivalent to RL 22, and have been satisfied. Consistent from lot to lot with my powder and rifle and only a little variation from cold to hot conditions.</p><p> My old, middle 80's Weatherby data sheet, used Hodgdon H4831 in all their recommended loads. Just for some added information from this data sheet:</p><p>This is with Weatherby brass, Fed 215 primers, and Hornady 180 grain bullets using H4831 powder. It will show that H4831 gives about 100 fps slower velocity than using Norma MRP powder.</p><p>80 grains H4831--180 gr Hornady--3060 fps---50240psi</p><p>82 grains H4831--180 gr Hornady--3145 fps---54310 psi</p><p>Norma MRP powder--81.8 grains--3245 fps-----51800 psi</p><p>This data sheet says not to load above 55,000 psi</p><p> Data in my Weatherby data sheet for 200 grain Nosler Partitions using H4831 versus Norma MRP powder:</p><p>77.2 grains Norma MRP---200 Nos Part---3000 fps---49000 psi</p><p>H4831---76 grains---------200 Nos Part.---2858 fps--46480 psi</p><p>H4831---78 grains---------200 Nos Part. --2926 fps---50620 psi</p><p>H4831---80 grains---------200 Nos Part. --3029 fps---54,690 psi</p><p> Note again Weatherby says no loads over 55000 psi and the top loads above may be too hot in your rifle.</p><p> This is just for added info for your Weatherby. I've shot some loads using IMR 4831 but didn't get the velocity that Norma MRP showed.</p></blockquote><p></p>
[QUOTE="rg1, post: 526112, member: 11927"] I too have read that RL 22 can be inconsistent but what I've seen said is that others have seen variations between lots but haven't seen mentioned that the same lot number varies except some difference between hot summer and cold weather. I've used 3 different lots of Norma MRP, the equivalent to RL 22, and have been satisfied. Consistent from lot to lot with my powder and rifle and only a little variation from cold to hot conditions. My old, middle 80's Weatherby data sheet, used Hodgdon H4831 in all their recommended loads. Just for some added information from this data sheet: This is with Weatherby brass, Fed 215 primers, and Hornady 180 grain bullets using H4831 powder. It will show that H4831 gives about 100 fps slower velocity than using Norma MRP powder. 80 grains H4831--180 gr Hornady--3060 fps---50240psi 82 grains H4831--180 gr Hornady--3145 fps---54310 psi Norma MRP powder--81.8 grains--3245 fps-----51800 psi This data sheet says not to load above 55,000 psi Data in my Weatherby data sheet for 200 grain Nosler Partitions using H4831 versus Norma MRP powder: 77.2 grains Norma MRP---200 Nos Part---3000 fps---49000 psi H4831---76 grains---------200 Nos Part.---2858 fps--46480 psi H4831---78 grains---------200 Nos Part. --2926 fps---50620 psi H4831---80 grains---------200 Nos Part. --3029 fps---54,690 psi Note again Weatherby says no loads over 55000 psi and the top loads above may be too hot in your rifle. This is just for added info for your Weatherby. I've shot some loads using IMR 4831 but didn't get the velocity that Norma MRP showed. [/QUOTE]
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IMR or H4831 in 300 wby?
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