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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm Allen Magnum/RL33/180 gr Berger testing
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<blockquote data-quote="mark fox" data-source="post: 1070431" data-attributes="member: 59903"><p>I statred this project about 10 years ago my 1st design was just like yours. but with a 42 deg shoulder 32" pipe 180 bergers were 3475 to 3500 fps with w872 100% 103.0 gr no preasure. my first reamer had a .012 body taper. I then moved the shoulder foward and did a .008 body taper and went the 42 deg. shoulder again. Most of my cartrages have .008 or less body taper 40 to 42 deg shoulder. It has worked very well for me. the only down side to it is chambers must be perfect & highly polished. Case preasure desplacement and a more localized burn were my reasons. it has worked very well for me in the past. my 6.5 perseus pushes a 140 gr vld at 3785 with a 34" pipe. 160 matrix at 3592 fps. my 6.5 taz same design off wsm case 140 vld 3495 fps with 28" pipe 73.9 gs of magpro my 8mm kronos custom 265 gr bullets (b.c. .776 bc.) 3471 fps 34" pipe 139.5 gr of retembo. and the list goes on a total of 21 cartrages. We all do things that sometimes it only makes sence to us. we live & learn. my 284 tyrannos will find it sweet spot. just need the write combo. Accuracy has never been the issue. I use to shoot ftr open ( high master) now i just build them. 13 of my guns were at sw berger nationals. I gained high master with my 6.5 perseus. have you ever used vv 570 powder i think i will try it along with the us 869 thanks mark fox 503-267-4311</p></blockquote><p></p>
[QUOTE="mark fox, post: 1070431, member: 59903"] I statred this project about 10 years ago my 1st design was just like yours. but with a 42 deg shoulder 32" pipe 180 bergers were 3475 to 3500 fps with w872 100% 103.0 gr no preasure. my first reamer had a .012 body taper. I then moved the shoulder foward and did a .008 body taper and went the 42 deg. shoulder again. Most of my cartrages have .008 or less body taper 40 to 42 deg shoulder. It has worked very well for me. the only down side to it is chambers must be perfect & highly polished. Case preasure desplacement and a more localized burn were my reasons. it has worked very well for me in the past. my 6.5 perseus pushes a 140 gr vld at 3785 with a 34" pipe. 160 matrix at 3592 fps. my 6.5 taz same design off wsm case 140 vld 3495 fps with 28" pipe 73.9 gs of magpro my 8mm kronos custom 265 gr bullets (b.c. .776 bc.) 3471 fps 34" pipe 139.5 gr of retembo. and the list goes on a total of 21 cartrages. We all do things that sometimes it only makes sence to us. we live & learn. my 284 tyrannos will find it sweet spot. just need the write combo. Accuracy has never been the issue. I use to shoot ftr open ( high master) now i just build them. 13 of my guns were at sw berger nationals. I gained high master with my 6.5 perseus. have you ever used vv 570 powder i think i will try it along with the us 869 thanks mark fox 503-267-4311 [/QUOTE]
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7mm Allen Magnum/RL33/180 gr Berger testing
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