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Rifles, Reloading, Optics, Equipment
Reloading
210 bergers blowing up?? help 30-378 wby
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<blockquote data-quote="Mysticplayer" data-source="post: 109692" data-attributes="member: 8947"><p>If I may add a few points:</p><p></p><p>Retumbo is faster then H50BMG and similar to H870. I would look at the H50BMG for sure as a powder in the wby. Even consider getting some slow lot WCC872.</p><p></p><p>If you find that the bullet cannot engrave in the lands BEFORE leaving the case neck, that is a very bad thing. That jump at 65000psi can push the base of the bullet in a variety of directions forcing the bullet to engrave cockeyed to the bore.</p><p></p><p>Spinning a thin jacketed bullet down a bore less then true puts a great deal of stress on the bullet. Then it leaves and flies like a wobbly football. It never gets a chance to settle down because the rotational stresses tear it apart.</p><p></p><p>That is a big reason that VLD bullets like to be very close or onto the lands. Helps them get a nice straight start.</p><p></p><p>I recently had three new rifles to work up. All shot very well but then accuracy went south and pressures went up. It seemed that when new, the throats were all smooth but after a few hundred rds, they roughened up enough to affect pressures/loads/accuracy.</p><p></p><p>A reduction in powder and things have settled down. They are now shooting the lower loads consistently. Maybe that has also happened to your barrel.</p><p></p><p>Finally, if there is lots of powder or copper fouling, it might be causing the bullet to have poor grip on the lands.</p><p> </p><p>Try cleaning the bore often and see if that helps. Also, use a strong ammonia cleaner to remove copper fouling. I am always amazed at how poorly some cleaners are at removing copper. Barnes CR10 is my favorite commercial product. With a stiff nylon brush, you should be able to get and keep that bore clean. However, only clean as much or as often as the barrel needs.</p><p></p><p></p><p>Jerry</p></blockquote><p></p>
[QUOTE="Mysticplayer, post: 109692, member: 8947"] If I may add a few points: Retumbo is faster then H50BMG and similar to H870. I would look at the H50BMG for sure as a powder in the wby. Even consider getting some slow lot WCC872. If you find that the bullet cannot engrave in the lands BEFORE leaving the case neck, that is a very bad thing. That jump at 65000psi can push the base of the bullet in a variety of directions forcing the bullet to engrave cockeyed to the bore. Spinning a thin jacketed bullet down a bore less then true puts a great deal of stress on the bullet. Then it leaves and flies like a wobbly football. It never gets a chance to settle down because the rotational stresses tear it apart. That is a big reason that VLD bullets like to be very close or onto the lands. Helps them get a nice straight start. I recently had three new rifles to work up. All shot very well but then accuracy went south and pressures went up. It seemed that when new, the throats were all smooth but after a few hundred rds, they roughened up enough to affect pressures/loads/accuracy. A reduction in powder and things have settled down. They are now shooting the lower loads consistently. Maybe that has also happened to your barrel. Finally, if there is lots of powder or copper fouling, it might be causing the bullet to have poor grip on the lands. Try cleaning the bore often and see if that helps. Also, use a strong ammonia cleaner to remove copper fouling. I am always amazed at how poorly some cleaners are at removing copper. Barnes CR10 is my favorite commercial product. With a stiff nylon brush, you should be able to get and keep that bore clean. However, only clean as much or as often as the barrel needs. Jerry [/QUOTE]
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210 bergers blowing up?? help 30-378 wby
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