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Rifles, Reloading, Optics, Equipment
Reloading
300RUM reloading experts needed
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<blockquote data-quote="MontanaRifleman" data-source="post: 322276" data-attributes="member: 11717"><p>I find this a very interesting thread being a new owner of a 300 RUM. I am new to reloading for it so I am by no means an expert but I'll share the little bit of experience I have with it.</p><p> </p><p>First I attempted to do a Gun Juice break-in while working up to max loads with two powders, Retumbo and H1000, and three bullets, 180 E-Tips, 200 AB's and 210 Bergers, as mentioned in another thread. The rifle was a slightly use Sendero. New Rem brass case necks were turned but not trimmed. I dont trim brass until it's been fired. I was getting very early pressure signs at what I guessed was maybe 3-4 grains lower than I expected to find max. I determined this was due tio the fact that I was firng these rounds through a bore that was wet brushed with Gun Juice after being cleaned, each shot. This probably doesn't have any bearing on the problem being looked at here, but just some history on what I've been experiencing.</p><p> </p><p>When I discovered that the Gun Juice treatment was the source of my early pressure signs, I worked up without it, and found powder charges and velociteis to exceed what I expected by about 2-3 grains and maybe 50 fps, i.e., 97 grains of Retumbo pushing a 200 AB @ 3250 plus without pressure signs. Went back and reloaded using Type S bushing dies, necked to leave about a .1" doughnut and still no trimming but sorted by length. In most cases, bullets were seated to barely fit the mag, approx .100 of the lands for the E-Tips and AB's. I got very spotty results pressure wise. Overall I was getting more pressure signs with the same loads that seemed OK before. But I sometimes I got pressure signs (stiff bolt) and sometimes not with the same charge and bullet.</p><p> </p><p>I mostly use Boretech Eliminator to clean with and it seems to leave a durable coating that is on my fingers as I type, that is almost a week old. I've been wondering if this causing a constriction in the bore?</p><p> </p><p>Bottom line, I am finding load development with these powders and bullets to be very tempormental for whatever the reason. I might try some 869 for grins.</p><p> </p><p>Oh what joy to have your pet load <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p><p> </p><p>Mark</p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 322276, member: 11717"] I find this a very interesting thread being a new owner of a 300 RUM. I am new to reloading for it so I am by no means an expert but I'll share the little bit of experience I have with it. First I attempted to do a Gun Juice break-in while working up to max loads with two powders, Retumbo and H1000, and three bullets, 180 E-Tips, 200 AB's and 210 Bergers, as mentioned in another thread. The rifle was a slightly use Sendero. New Rem brass case necks were turned but not trimmed. I dont trim brass until it's been fired. I was getting very early pressure signs at what I guessed was maybe 3-4 grains lower than I expected to find max. I determined this was due tio the fact that I was firng these rounds through a bore that was wet brushed with Gun Juice after being cleaned, each shot. This probably doesn't have any bearing on the problem being looked at here, but just some history on what I've been experiencing. When I discovered that the Gun Juice treatment was the source of my early pressure signs, I worked up without it, and found powder charges and velociteis to exceed what I expected by about 2-3 grains and maybe 50 fps, i.e., 97 grains of Retumbo pushing a 200 AB @ 3250 plus without pressure signs. Went back and reloaded using Type S bushing dies, necked to leave about a .1" doughnut and still no trimming but sorted by length. In most cases, bullets were seated to barely fit the mag, approx .100 of the lands for the E-Tips and AB's. I got very spotty results pressure wise. Overall I was getting more pressure signs with the same loads that seemed OK before. But I sometimes I got pressure signs (stiff bolt) and sometimes not with the same charge and bullet. I mostly use Boretech Eliminator to clean with and it seems to leave a durable coating that is on my fingers as I type, that is almost a week old. I've been wondering if this causing a constriction in the bore? Bottom line, I am finding load development with these powders and bullets to be very tempormental for whatever the reason. I might try some 869 for grins. Oh what joy to have your pet load :D Mark [/QUOTE]
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300RUM reloading experts needed
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