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Hunting
The Basics, Starting Out
Is my barrel worn out?
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<blockquote data-quote="Teri Anne" data-source="post: 2255972" data-attributes="member: 118816"><p>Back in the early 70's I bought a new Winchester Model 70 in 30-06. At that time I used it for deer hunting as well as metallic silhouette competition. I shot a lot, most of it competition. I kept track of the number of rounds fired using my shooting log and noticed that around 1000 rounds my groups had started to open up and I started missing chickens. A few hundred rounds more and I was missing pigs. Checking everything I could think of and coming up with noting that should cause this problem I contacted Winchester. Their response was, "The rifle is a Sporter and as such with 1200 rounds the barrel from the factory was probably shot out. Sporters normally shoot no more than 20 shots a year, thus you have already exceeded the barrels design lifetime. Had my gunsmith borescope the barrel and it was indeed shot out. The throat was badly gas eroded far into the rifling. I had the rifle re-barreled with a 26 inch Obermeyer super match grade stainless barrel and rechambered in 7.62 NATO. Using Lake City match loading with Sierra 168 grain match bullets it would fore a 5 shot group at 0.045 inches at 100 yards. To make a long story short, have your gunsmith boresight your barrel to check it's condition. It is possible to shoot out a barrel at 1000 rounds.</p></blockquote><p></p>
[QUOTE="Teri Anne, post: 2255972, member: 118816"] Back in the early 70's I bought a new Winchester Model 70 in 30-06. At that time I used it for deer hunting as well as metallic silhouette competition. I shot a lot, most of it competition. I kept track of the number of rounds fired using my shooting log and noticed that around 1000 rounds my groups had started to open up and I started missing chickens. A few hundred rounds more and I was missing pigs. Checking everything I could think of and coming up with noting that should cause this problem I contacted Winchester. Their response was, "The rifle is a Sporter and as such with 1200 rounds the barrel from the factory was probably shot out. Sporters normally shoot no more than 20 shots a year, thus you have already exceeded the barrels design lifetime. Had my gunsmith borescope the barrel and it was indeed shot out. The throat was badly gas eroded far into the rifling. I had the rifle re-barreled with a 26 inch Obermeyer super match grade stainless barrel and rechambered in 7.62 NATO. Using Lake City match loading with Sierra 168 grain match bullets it would fore a 5 shot group at 0.045 inches at 100 yards. To make a long story short, have your gunsmith boresight your barrel to check it's condition. It is possible to shoot out a barrel at 1000 rounds. [/QUOTE]
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The Basics, Starting Out
Is my barrel worn out?
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