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7mm LRM
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<blockquote data-quote="AZShooter" data-source="post: 1327319" data-attributes="member: 5219"><p>I remember firstcoues's issues. He was supplied with brass that had thicker necks which wasn't discovered by Hornady or Gunwerks until many users complained of blown primers and erratic groupings. Some comments I kept from my documents file:</p><p></p><p>TDean: "shooting 2" and 3" groups at 100 and blowing primers and leaving ejector marks from excessive pressure. there's definitely a problem here I Just don't know if gunwerks realizes it. I have talked to the guys at gunwerks numerous times but they are not too enthusiastic about my concerns."</p><p></p><p>"Gunwerks also told me that i should anneal the brass necks after every 2 firings for whatever that's worth. I'm sure they wish they could get better brass. Most of the primer pockets are loose after just 1 firing. "</p><p>"I got a call from Gunwerks, they have offered me a refund for some of the work and the dies and brass i bought. I would like to say that i appreciate their integrity and that they now believe me after others have had similar issued with the brass. " </p><p></p><p>------------------</p><p>The explanation for excessive pressure and loading issues from a few years ago:</p><p></p><p>FirstCoues just had his gunsmith make him a 7 LRM. He was damaging the 175 LR Accubond when he seated them. </p><p></p><p>I asked him to get some measurements:</p><p></p><p>The brass and dies were supplied by Gunwerks. The Hornady die is a FL/bushing die and came with a .316" bushing (I suggested to him he get a .317" bushing as well)</p><p></p><p>His reamer has a .321" neck dimension</p><p></p><p>The first few pieces of brass he measured had a neck ODs of .3175" - .318" This translates into necks slightly less than or exactly .017" thick</p><p></p><p>IF all the brass is no more than .017" thick the bullet release per side in the chamber neck is .002"</p><p>That is approaching clearances that are used in BR shooting. Quite frankly it is cutting the clearance too close for brass that isn't neck turned. I would bet that some brass would come with neck wall thicknesses greater than .017". </p><p></p><p>Sure enough my friend measured one case that he ran through his .317" bushing that had an ID of .277"! That computes to neck wall thickness of .020" WOW! If he were to seat a bullet and try to put it into the chamber it wouldn't fit. OD would be .324"</p><p></p><p>He is going to use the supplied sizer ball and size a bunch of brass. He will then seat bullets for measurement. (he doesn't have a ball mike) He will then carefully measure all neck ODs. I think he will find quite a few that are thicker. I told him he really should turn all his necks to ensure he doesn't have any pressure issues. Heck even some variance would ruin LR groups. </p><p></p><p>He says he believes the gunsmith borrowed the reamer from Gunwerks. Will report on that when I know for sure.</p><p></p><p>Our mutual friend Dennis turned the necks for FirstCoues which solved this issue.</p><p>----------------------</p><p></p><p>Perhaps I have discovered the reason why some cannot duplicate Gunwerk's pet load without excessive pressure. TDean appears to be correct, the Hornady brass is varying in its dimensions.</p><p>--------------</p><p>After many customers complained Gunwerks dealt with the thicker neck wall dimension issue. IIRC they offered to buy back the out of spec brass.</p><p></p><p>If I were considering making a new 7mm I would go with the 28 Nosler using Norma brass. </p><p></p><p></p><p></p><p>.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 1327319, member: 5219"] I remember firstcoues's issues. He was supplied with brass that had thicker necks which wasn't discovered by Hornady or Gunwerks until many users complained of blown primers and erratic groupings. Some comments I kept from my documents file: TDean: "shooting 2" and 3" groups at 100 and blowing primers and leaving ejector marks from excessive pressure. there's definitely a problem here I Just don't know if gunwerks realizes it. I have talked to the guys at gunwerks numerous times but they are not too enthusiastic about my concerns." "Gunwerks also told me that i should anneal the brass necks after every 2 firings for whatever that’s worth. I’m sure they wish they could get better brass. Most of the primer pockets are loose after just 1 firing. " "I got a call from Gunwerks, they have offered me a refund for some of the work and the dies and brass i bought. I would like to say that i appreciate their integrity and that they now believe me after others have had similar issued with the brass. " ------------------ The explanation for excessive pressure and loading issues from a few years ago: FirstCoues just had his gunsmith make him a 7 LRM. He was damaging the 175 LR Accubond when he seated them. I asked him to get some measurements: The brass and dies were supplied by Gunwerks. The Hornady die is a FL/bushing die and came with a .316" bushing (I suggested to him he get a .317" bushing as well) His reamer has a .321" neck dimension The first few pieces of brass he measured had a neck ODs of .3175" - .318" This translates into necks slightly less than or exactly .017" thick IF all the brass is no more than .017" thick the bullet release per side in the chamber neck is .002" That is approaching clearances that are used in BR shooting. Quite frankly it is cutting the clearance too close for brass that isn't neck turned. I would bet that some brass would come with neck wall thicknesses greater than .017". Sure enough my friend measured one case that he ran through his .317" bushing that had an ID of .277"! That computes to neck wall thickness of .020" WOW! If he were to seat a bullet and try to put it into the chamber it wouldn't fit. OD would be .324" He is going to use the supplied sizer ball and size a bunch of brass. He will then seat bullets for measurement. (he doesn't have a ball mike) He will then carefully measure all neck ODs. I think he will find quite a few that are thicker. I told him he really should turn all his necks to ensure he doesn't have any pressure issues. Heck even some variance would ruin LR groups. He says he believes the gunsmith borrowed the reamer from Gunwerks. Will report on that when I know for sure. Our mutual friend Dennis turned the necks for FirstCoues which solved this issue. ---------------------- Perhaps I have discovered the reason why some cannot duplicate Gunwerk's pet load without excessive pressure. TDean appears to be correct, the Hornady brass is varying in its dimensions. -------------- After many customers complained Gunwerks dealt with the thicker neck wall dimension issue. IIRC they offered to buy back the out of spec brass. If I were considering making a new 7mm I would go with the 28 Nosler using Norma brass. . [/QUOTE]
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