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Rifles, Reloading, Optics, Equipment
Reloading
Forming Cases/rechambering
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<blockquote data-quote="frostop" data-source="post: 1162252" data-attributes="member: 22611"><p>I am posting this here since there is a tremendous amount of knowledge on this forum and I feel that I will get honest answers.</p><p> </p><p>A little history first, I have been shooting and hunting a very long time 30+ yrs. I have done some minor conversions-7-30 waters, 280 Ackley, both of which are simple, than there is the rifle that I am working on now. Ruger M77 MkII which started as .243. I purchased used and had converted to .338 Jamison, I have had this rifle for approximately 10+ years, have never really been happy with it, mainly the chambering that I wasn't happy with.</p><p> </p><p>Ok, to the point. The Jamison rounds are essentially a WSM, the Jamison is a tenth longer in length overall and at the shoulder than the wsm's, the wsm's have a rim diameter that is 100th smaller and base diameter that is 100th larger-these are approximate.</p><p> </p><p>I have noticed a fair amount of you that run the 270 wsm and those of you seem to like that round and it seems that it would make a decent long range round. I could re-chamber to 277 Jamison but I have gone through a priced all parts and pieces that it would take-custom forming dies, custom full length and seating die, custom reamer, just those alone would run approximately $550. My thought is why not re-chamber to 270 wsm! The only difference would be the rim diameter would stay the same since my bolt face is already opened up to the Jamison round and getting a new bolt for a Ruger isn't feasible-I made that phone call also. Obviously I wouldn't be able to just use wsm brass or even loaded ammo because of that!</p><p> </p><p>The questions that I have are;</p><p>Is that .01 of an inch difference at the base an issue? Case would have to blow out that much?</p><p>Since this is basically a neck down operation-could I just use full length wsm dies? My only concern here is the shoulder, will I be able to set it back .1 inch with full length dies? Or will I crush the cases?</p><p> </p><p>Sorry for the long winded post.</p><p> </p><p>Thank you in advance for any and all replies</p><p> </p><p>Gary</p></blockquote><p></p>
[QUOTE="frostop, post: 1162252, member: 22611"] I am posting this here since there is a tremendous amount of knowledge on this forum and I feel that I will get honest answers. A little history first, I have been shooting and hunting a very long time 30+ yrs. I have done some minor conversions-7-30 waters, 280 Ackley, both of which are simple, than there is the rifle that I am working on now. Ruger M77 MkII which started as .243. I purchased used and had converted to .338 Jamison, I have had this rifle for approximately 10+ years, have never really been happy with it, mainly the chambering that I wasn't happy with. Ok, to the point. The Jamison rounds are essentially a WSM, the Jamison is a tenth longer in length overall and at the shoulder than the wsm's, the wsm's have a rim diameter that is 100th smaller and base diameter that is 100th larger-these are approximate. I have noticed a fair amount of you that run the 270 wsm and those of you seem to like that round and it seems that it would make a decent long range round. I could re-chamber to 277 Jamison but I have gone through a priced all parts and pieces that it would take-custom forming dies, custom full length and seating die, custom reamer, just those alone would run approximately $550. My thought is why not re-chamber to 270 wsm! The only difference would be the rim diameter would stay the same since my bolt face is already opened up to the Jamison round and getting a new bolt for a Ruger isn't feasible-I made that phone call also. Obviously I wouldn't be able to just use wsm brass or even loaded ammo because of that! The questions that I have are; Is that .01 of an inch difference at the base an issue? Case would have to blow out that much? Since this is basically a neck down operation-could I just use full length wsm dies? My only concern here is the shoulder, will I be able to set it back .1 inch with full length dies? Or will I crush the cases? Sorry for the long winded post. Thank you in advance for any and all replies Gary [/QUOTE]
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