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Rifles, Reloading, Optics, Equipment
Reloading
load data for 7mm LRM
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<blockquote data-quote="AZShooter" data-source="post: 909334" data-attributes="member: 5219"><p>Moombaskier,</p><p></p><p>Thanks for sharing the specifics of the new 7 LRM reamer throating. The suggested .025" jump is shorter than what Kiwi Nate suggested for the 7mm LRM in his article on the 7mm Practical: "To avoid finicky performance, its best to have some freebore with this design, approximately .250". The case capacity is just a little too much to do otherwise." Any way you slice it the freebore is far shorter than the 7 RUM! This is very useful knowledge. </p><p></p><p>I have been using a PT&G reamer for a 7mm/375. (full length shoulder and short neck) I recently installed an old barrel on my LA Ruger that has a lengthened mag box. Box is still too short yielding a .210" jump to rifling! I shot this package just to see how the jump would work. It didn't. Thankfully the rechambered 284 win barrel was something that I won't be using and can be thrown away. It WAS funny to use a 21" barrel for the test. Pet loads of H-1000 and 180 berger hybrid yielded 2900 and change. I didn't see the fireball but I'd bet there was some significant flame in front of the barrel and it was LOUD. </p><p></p><p>I have concluded that I will send my reamer back to PT&G to shorten the throat length so I can kiss the rifling with max OAL to fit Ruger's magazine then seat bullet an additional .025" or so. I will also buy a throating reamer so I can lengthen the throat for other rifles with longer magazines. </p><p></p><p>I have a worn out Lilja barrel that is currently a 257. It is a beauty #5 fluted SS 28" long. I am going to have Dan Pederson re-bore and re-rifle it for 7mm. This way I can get some value out of this expensive barrel. Am going to use a faster twist as I would like to try the upcoming 195 Berger.</p><p></p><p>Looking forward to more updates from you or tdean on your results.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 909334, member: 5219"] Moombaskier, Thanks for sharing the specifics of the new 7 LRM reamer throating. The suggested .025" jump is shorter than what Kiwi Nate suggested for the 7mm LRM in his article on the 7mm Practical: "To avoid finicky performance, its best to have some freebore with this design, approximately .250". The case capacity is just a little too much to do otherwise." Any way you slice it the freebore is far shorter than the 7 RUM! This is very useful knowledge. I have been using a PT&G reamer for a 7mm/375. (full length shoulder and short neck) I recently installed an old barrel on my LA Ruger that has a lengthened mag box. Box is still too short yielding a .210" jump to rifling! I shot this package just to see how the jump would work. It didn't. Thankfully the rechambered 284 win barrel was something that I won't be using and can be thrown away. It WAS funny to use a 21" barrel for the test. Pet loads of H-1000 and 180 berger hybrid yielded 2900 and change. I didn't see the fireball but I'd bet there was some significant flame in front of the barrel and it was LOUD. I have concluded that I will send my reamer back to PT&G to shorten the throat length so I can kiss the rifling with max OAL to fit Ruger's magazine then seat bullet an additional .025" or so. I will also buy a throating reamer so I can lengthen the throat for other rifles with longer magazines. I have a worn out Lilja barrel that is currently a 257. It is a beauty #5 fluted SS 28" long. I am going to have Dan Pederson re-bore and re-rifle it for 7mm. This way I can get some value out of this expensive barrel. Am going to use a faster twist as I would like to try the upcoming 195 Berger. Looking forward to more updates from you or tdean on your results. [/QUOTE]
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Reloading
load data for 7mm LRM
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