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
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
