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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
preasure problems with 7 ultra
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<blockquote data-quote="Michael Eichele" data-source="post: 288720" data-attributes="member: 1007"><p>I also should mention that my throat had not moved any, rather it was just very cracked and burned. This is where the friction came from. This was seen through a bore scope. At 200 rounds, you may not see much if any throat movement yet but if you scope it, you will likely see serious cracking and burning in the throat area.</p><p></p><p>Interestingly, I have had 2 300 RUM barrel demonstarate the same things, one was a cut rifled barrel and the other was a button pulled barrel. The button pulled barrel showed these signs at a MUCH slower rate and not nearly as severe. The cut rifled barrel showed sign early on and in dramatic fasion.</p><p></p><p>The ballistics of the RUMs are impressive but these come with a hefty price.</p><p></p><p>It could still be something else but my money is on the throat.</p><p></p><p>My solution was that after things settled in was to reduce the loads a bit. I didnt like doing it because I was shooting a RUM for its speed and power never the less, I was forced to. I ended up shooting 180's at 3250 instead of the common 3350-3400+. This gave me some stability and consistency.</p><p></p><p>If your barrel turns out to be the same, you may consider reducing your loads a bit. If this is just starting to manifest itself I would suspect you are using a button pulled barrel?? If so, you should have some accurate life left by reducing your loads. Another concideration is to have it cut back a bit on the breach end and have it chambered in 7mm WSM. This will offer you the same bolt face and more barrel life, less recoil and evry bit as good if not better accuracy and certainly more consistency.</p><p></p><p>I hope that helps some.</p></blockquote><p></p>
[QUOTE="Michael Eichele, post: 288720, member: 1007"] I also should mention that my throat had not moved any, rather it was just very cracked and burned. This is where the friction came from. This was seen through a bore scope. At 200 rounds, you may not see much if any throat movement yet but if you scope it, you will likely see serious cracking and burning in the throat area. Interestingly, I have had 2 300 RUM barrel demonstarate the same things, one was a cut rifled barrel and the other was a button pulled barrel. The button pulled barrel showed these signs at a MUCH slower rate and not nearly as severe. The cut rifled barrel showed sign early on and in dramatic fasion. The ballistics of the RUMs are impressive but these come with a hefty price. It could still be something else but my money is on the throat. My solution was that after things settled in was to reduce the loads a bit. I didnt like doing it because I was shooting a RUM for its speed and power never the less, I was forced to. I ended up shooting 180's at 3250 instead of the common 3350-3400+. This gave me some stability and consistency. If your barrel turns out to be the same, you may consider reducing your loads a bit. If this is just starting to manifest itself I would suspect you are using a button pulled barrel?? If so, you should have some accurate life left by reducing your loads. Another concideration is to have it cut back a bit on the breach end and have it chambered in 7mm WSM. This will offer you the same bolt face and more barrel life, less recoil and evry bit as good if not better accuracy and certainly more consistency. I hope that helps some. [/QUOTE]
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preasure problems with 7 ultra
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