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Rifles, Reloading, Optics, Equipment
Reloading
Accuracy=seating depth or tenths of powder
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<blockquote data-quote="barefooter56" data-source="post: 1132196" data-attributes="member: 85389"><p>I think you would really have to have a hugely overbore cartridge rifle burning a fast powder to erode a barrel throat that quickly (.001 per couple of dozen rounds or so). When I was shooting PALMA my average on a Kreiger barrel / 1-13 twist/ 30 inch finish, using (then) a SIERRA 2155 155 grain bullet ( hard jacket) and N-550 powder ( thought to be very erosive by some) pushing that bullet at 3030 fps. My throat erosion over the course of a season ( usually 10 matches plus the nationals) and practice , ( 10 matches at 60 rounds per match including sighters plus the nationals about 300 rounds including sighters = ABOUT 900 rounds plus practice I put about 1200-1300 rounds per year down that barrel and only averaged about .010 at most. Some of that practice was seating depth testing during the season. Must have had a pretty wide seating depth accuracy node because I only had to adjust the seating depth about .002-.003 over the course of the season. Powder charge was tweaked slightly to stay on velocity node. But that was THAT rifle barrel. Hunters may go a lot longer and benchrest shooters a lot shorter in time span before noticing any fall off in accuracy where they have to adjust something. IMHO is that seating depth sensitivity should be taken on a case by case basis depending on what you are using the rifle for , how much the accuracy falls off and how much accuracy for what you are using the rifle for is needed/wanted. That being said. A known seating depth accuracy node can only help when doing any accuracy diagnosis down the road. thoughts?</p></blockquote><p></p>
[QUOTE="barefooter56, post: 1132196, member: 85389"] I think you would really have to have a hugely overbore cartridge rifle burning a fast powder to erode a barrel throat that quickly (.001 per couple of dozen rounds or so). When I was shooting PALMA my average on a Kreiger barrel / 1-13 twist/ 30 inch finish, using (then) a SIERRA 2155 155 grain bullet ( hard jacket) and N-550 powder ( thought to be very erosive by some) pushing that bullet at 3030 fps. My throat erosion over the course of a season ( usually 10 matches plus the nationals) and practice , ( 10 matches at 60 rounds per match including sighters plus the nationals about 300 rounds including sighters = ABOUT 900 rounds plus practice I put about 1200-1300 rounds per year down that barrel and only averaged about .010 at most. Some of that practice was seating depth testing during the season. Must have had a pretty wide seating depth accuracy node because I only had to adjust the seating depth about .002-.003 over the course of the season. Powder charge was tweaked slightly to stay on velocity node. But that was THAT rifle barrel. Hunters may go a lot longer and benchrest shooters a lot shorter in time span before noticing any fall off in accuracy where they have to adjust something. IMHO is that seating depth sensitivity should be taken on a case by case basis depending on what you are using the rifle for , how much the accuracy falls off and how much accuracy for what you are using the rifle for is needed/wanted. That being said. A known seating depth accuracy node can only help when doing any accuracy diagnosis down the road. thoughts? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Accuracy=seating depth or tenths of powder
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