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Rifles, Reloading, Optics, Equipment
Reloading
338-378 questions
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<blockquote data-quote="Long Time Long Ranger" data-source="post: 394600" data-attributes="member: 505"><p>James is right on, they are 1-10. I use standard RCBS dies I got for $26 and neck size. First thing you want to do is freefloat the barrel, bed the action and adjust the trigger. All that is easy with the mk 5 and should get you very good accuracy. The 338-378 wby is an extremely accurate long range round. Most all mk 5's after doing this work will easily kill game at a 1/2 mile with proper loads. The 300 grain bullets kick so hard in light rifles I do not fool with them. The light rifle is best inside a half mile so use light bullets best suited for that range. 225 Accubonds with the .55 bc at over 3400 fps give very good ballistics with minimal recoil. I am trying the 185 Barnes ttsx .432 in mine at 3650 fps. I killed a big 6x6 elk about three years ago with a 200 grain nosler ballistic tip .414 at 914 yards. Muzzle velocity was just under 3600 fps. H-870 is the best powder I have used with it but Retumbo also does very well. The slowest ball powders you can find are best. You just can't get enough of the extruded type powders in there. Retumbo is the best of these. I use over 130 grains of H-870. My loads are with a 28" barrel. With this round you are stepping up quite a bit in performance over the ultramag and standard lapua chamberings.</p></blockquote><p></p>
[QUOTE="Long Time Long Ranger, post: 394600, member: 505"] James is right on, they are 1-10. I use standard RCBS dies I got for $26 and neck size. First thing you want to do is freefloat the barrel, bed the action and adjust the trigger. All that is easy with the mk 5 and should get you very good accuracy. The 338-378 wby is an extremely accurate long range round. Most all mk 5's after doing this work will easily kill game at a 1/2 mile with proper loads. The 300 grain bullets kick so hard in light rifles I do not fool with them. The light rifle is best inside a half mile so use light bullets best suited for that range. 225 Accubonds with the .55 bc at over 3400 fps give very good ballistics with minimal recoil. I am trying the 185 Barnes ttsx .432 in mine at 3650 fps. I killed a big 6x6 elk about three years ago with a 200 grain nosler ballistic tip .414 at 914 yards. Muzzle velocity was just under 3600 fps. H-870 is the best powder I have used with it but Retumbo also does very well. The slowest ball powders you can find are best. You just can't get enough of the extruded type powders in there. Retumbo is the best of these. I use over 130 grains of H-870. My loads are with a 28" barrel. With this round you are stepping up quite a bit in performance over the ultramag and standard lapua chamberings. [/QUOTE]
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Reloading
338-378 questions
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