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Long Range Hunting & Shooting
Rapidly expanding groups?
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<blockquote data-quote="vividus1" data-source="post: 1335924" data-attributes="member: 92951"><p>Thanks again for all the replies...helps a newb like me for sure. So I scrubbed the bore totally clean with J-B (like 50 strokes with a bore brush with a couple applications of J-B, which a Browning tech told me to do), ran a couple of patches Hoppes bore cleaner afterward to ensure J-B was all out, then a very very light oil patch. Went out and shot only the Barnes LRX with no cleaning of any kind between shots/groups...the rifle behaved like I'd expect which is to say it shot well. I shot two 10 shot groups (one at 100 yards, one at 200) allowing time between shots for the barrel to cool to ambient conditions; the 100 yards group was right at 1.25" including a minor "flyer"...the rest all touched. The 200 yard group stayed just under 2" and now I'm a fairly happy camper. The rifle now has about 70 rounds and the follow-up clean was much easier than any of my previous bore cleans. </p><p></p><p>Browning tech told me a few things could be in play 1) could easily have a minor barrel inclusion that needed more time to shoot out and was thus copper fouling badly in one spot. 2) mix and matching the Accubonds and LRX (or often any other monolithic and bonded bullets) without removing the copper between them causes all sorts of unpredictable bullet flight due to the differences in copper alloys. 3) that the velocity this gun demonstrated on the chronograph can make this and any other fast gun touchy in general in regards to cleaning. He also told me to take care to clean the throat carbon out after about 50-100 shots. I hope some of this info may help somebody else sometime!</p></blockquote><p></p>
[QUOTE="vividus1, post: 1335924, member: 92951"] Thanks again for all the replies...helps a newb like me for sure. So I scrubbed the bore totally clean with J-B (like 50 strokes with a bore brush with a couple applications of J-B, which a Browning tech told me to do), ran a couple of patches Hoppes bore cleaner afterward to ensure J-B was all out, then a very very light oil patch. Went out and shot only the Barnes LRX with no cleaning of any kind between shots/groups...the rifle behaved like I'd expect which is to say it shot well. I shot two 10 shot groups (one at 100 yards, one at 200) allowing time between shots for the barrel to cool to ambient conditions; the 100 yards group was right at 1.25" including a minor "flyer"...the rest all touched. The 200 yard group stayed just under 2" and now I'm a fairly happy camper. The rifle now has about 70 rounds and the follow-up clean was much easier than any of my previous bore cleans. Browning tech told me a few things could be in play 1) could easily have a minor barrel inclusion that needed more time to shoot out and was thus copper fouling badly in one spot. 2) mix and matching the Accubonds and LRX (or often any other monolithic and bonded bullets) without removing the copper between them causes all sorts of unpredictable bullet flight due to the differences in copper alloys. 3) that the velocity this gun demonstrated on the chronograph can make this and any other fast gun touchy in general in regards to cleaning. He also told me to take care to clean the throat carbon out after about 50-100 shots. I hope some of this info may help somebody else sometime! [/QUOTE]
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