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The Basics, Starting Out
Question: Reamer Dimensions vs Chamber Dimensions vs Case Dimensions
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<blockquote data-quote="tracybartlein" data-source="post: 3052649" data-attributes="member: 12065"><p>You have min spec reamers/chambers, what guys call match spec chambers and I use this phrase loosely, and you have what is called production spec chambers. A gun manufacturer can make the chambers to Saami min spec, or they can use what is called production spec. and that is up to their discretion. I've got prints for production chambers that are as big as +.002" oversize on the diameters in some cases.</p><p></p><p>How the reamer is ground and how it cuts can be two completely different things. It can cut to size, and it cannot cut to size. Dealing with this right now.... reamers are to spec for a job we are doing for ammunition test barrels, but the dam things will not cut at all! The owner bought 10 of them. Sent us two of them. You can literally roll the reamer in your fingers, and you cannot cut yourself....it won't bite at all.</p><p></p><p>Also I've seen brand new reamers where we have to measure the chamber and supply an inspection report where we have to measure the chamber in 10 different areas to check the diameter and we have to hold a tolerance on the given diameter. Reamer measured to spec but half of the dimensions cut oversize. To the point you cannot save the barrel. We scrapped $5k worth of barrels because of it (only 6 barrels). I sent the reamer back to the manufacturer all I got on the phone and by email was the reamer was in spec. I said it might measure to spec but it isn't cutting to spec! Then I sent a breech end of one of the barrels along with the gov't inspection gauges along with our inspection report and told them you measure and tell me what you get! Again, all I get told was the reamer was in spec. I said I was done...send all my stuff back. This wasn't the first time we had issues with this reamer manufacturer, and I refuse to buy anymore. If a customer sends us his action and reamer to fit up a barrel to his gun, we will take his reamer and run it into a scrap blank to see how it cuts first before we run it into a good barrel.</p><p></p><p>I helped a customer last year.... twice he sent his rifle back to the gunsmith because it wouldn't chamber box 308win ammo. The gunsmith charged him for the rework. I told him to ask the gunsmith for a copy of the print and the gunsmith refused to give him one. He gets the rifle back and again it won't chamber ammo and is sticking bullets in the barrel. Finally he called and asked if I could help as it was supposed to be our barrel. I said sure send it in. Well the gunsmith only used a roughing reamer from what we seen. Then I had to break the news to the guy that it wasn't our barrel on top of all that! We got him all fixed up and returned it to him at n/c. Gun functioned fine and actually gave him groups of 3/4 to 1moa. Which he was o.k. with as it was a hunting rifle but not what he really wanted.</p><p></p><p>My recommendation is this if you're getting a custom chamber/barrel installed. Ask the gunsmith for a copy of the reamer spec/print at least you have a reference for what was supposed to be put into the barrel.</p><p></p><p>I don't like renting tools. You don't know how many times the reamer has been used is just one reason.</p><p></p><p>Later, Frank</p><p>(Edited)</p></blockquote><p></p>
[QUOTE="tracybartlein, post: 3052649, member: 12065"] You have min spec reamers/chambers, what guys call match spec chambers and I use this phrase loosely, and you have what is called production spec chambers. A gun manufacturer can make the chambers to Saami min spec, or they can use what is called production spec. and that is up to their discretion. I've got prints for production chambers that are as big as +.002" oversize on the diameters in some cases. How the reamer is ground and how it cuts can be two completely different things. It can cut to size, and it cannot cut to size. Dealing with this right now.... reamers are to spec for a job we are doing for ammunition test barrels, but the dam things will not cut at all! The owner bought 10 of them. Sent us two of them. You can literally roll the reamer in your fingers, and you cannot cut yourself....it won't bite at all. Also I've seen brand new reamers where we have to measure the chamber and supply an inspection report where we have to measure the chamber in 10 different areas to check the diameter and we have to hold a tolerance on the given diameter. Reamer measured to spec but half of the dimensions cut oversize. To the point you cannot save the barrel. We scrapped $5k worth of barrels because of it (only 6 barrels). I sent the reamer back to the manufacturer all I got on the phone and by email was the reamer was in spec. I said it might measure to spec but it isn't cutting to spec! Then I sent a breech end of one of the barrels along with the gov't inspection gauges along with our inspection report and told them you measure and tell me what you get! Again, all I get told was the reamer was in spec. I said I was done...send all my stuff back. This wasn't the first time we had issues with this reamer manufacturer, and I refuse to buy anymore. If a customer sends us his action and reamer to fit up a barrel to his gun, we will take his reamer and run it into a scrap blank to see how it cuts first before we run it into a good barrel. I helped a customer last year.... twice he sent his rifle back to the gunsmith because it wouldn't chamber box 308win ammo. The gunsmith charged him for the rework. I told him to ask the gunsmith for a copy of the print and the gunsmith refused to give him one. He gets the rifle back and again it won't chamber ammo and is sticking bullets in the barrel. Finally he called and asked if I could help as it was supposed to be our barrel. I said sure send it in. Well the gunsmith only used a roughing reamer from what we seen. Then I had to break the news to the guy that it wasn't our barrel on top of all that! We got him all fixed up and returned it to him at n/c. Gun functioned fine and actually gave him groups of 3/4 to 1moa. Which he was o.k. with as it was a hunting rifle but not what he really wanted. My recommendation is this if you're getting a custom chamber/barrel installed. Ask the gunsmith for a copy of the reamer spec/print at least you have a reference for what was supposed to be put into the barrel. I don't like renting tools. You don't know how many times the reamer has been used is just one reason. Later, Frank (Edited) [/QUOTE]
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The Basics, Starting Out
Question: Reamer Dimensions vs Chamber Dimensions vs Case Dimensions
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