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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
short mag build
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<blockquote data-quote="Wallie" data-source="post: 2329158" data-attributes="member: 107256"><p>I have a 7mm/300WSM in a short action shooting 180 VLD's, node at 2925 fps but worked up to 3000 for pressure. It is a bit of a narrow window to fit in a standard AICS magazine and keep the ojive up out of the neck, but it's plenty doable.</p><p>I also started with the condition that it needed to fit in a short action (TL3 barrel trader), and be as short as possible (built to run suppressed) while carrying 1,000 ft/lb energy to 1k yards (an arbitrary performance benchmark of mine) and be light enough to be carryable.</p><p> I went with a sendero profile 1:9 twist Benchmark (love them folks, and they are local-ish to me).</p><p>I had a take off 7mm barrel I used for destructive testing (cut it 1" shorter and velocity test, repeat) in conjunction with a bunch of quickload fiddling and came up with a noticeable break over point of diminishing returns on length at 22".</p><p>I read Vince Bottomley's article on Accurateshooter.com and followed his advice to neck down Norma 300WSM brass and neck turn. I found an excellent load that was to long OAL to fit in my magazine, and had PTG reduce the free bore on my reamer to optimize mag fit with a little room to "chase" the seating node.</p><p>Bare muzzle was definitely to much recoil for me to shoot comfortably, but the TBAC suppressor mount brake while not super effective tamed it right down, and I shoot it suppressed almost exclusively.</p><p>A suppressor is really the secret that the OP needs to capitalize on in my opinion.</p><p>The SAUM would be a decent choice if you NEED to trade some performance for some recoil, but I chose to add a couple pounds (9 lb bare, 11 lbs configured as I hunt with it) mostly to aid in shootability, and because I don't mind carrying 11 lbs around.</p><p>I am fairly recoil sensitive, and my Ultra 7 suppressor is golden ticket for success in my book.</p></blockquote><p></p>
[QUOTE="Wallie, post: 2329158, member: 107256"] I have a 7mm/300WSM in a short action shooting 180 VLD’s, node at 2925 fps but worked up to 3000 for pressure. It is a bit of a narrow window to fit in a standard AICS magazine and keep the ojive up out of the neck, but it’s plenty doable. I also started with the condition that it needed to fit in a short action (TL3 barrel trader), and be as short as possible (built to run suppressed) while carrying 1,000 ft/lb energy to 1k yards (an arbitrary performance benchmark of mine) and be light enough to be carryable. I went with a sendero profile 1:9 twist Benchmark (love them folks, and they are local-ish to me). I had a take off 7mm barrel I used for destructive testing (cut it 1” shorter and velocity test, repeat) in conjunction with a bunch of quickload fiddling and came up with a noticeable break over point of diminishing returns on length at 22”. I read Vince Bottomley’s article on Accurateshooter.com and followed his advice to neck down Norma 300WSM brass and neck turn. I found an excellent load that was to long OAL to fit in my magazine, and had PTG reduce the free bore on my reamer to optimize mag fit with a little room to “chase” the seating node. Bare muzzle was definitely to much recoil for me to shoot comfortably, but the TBAC suppressor mount brake while not super effective tamed it right down, and I shoot it suppressed almost exclusively. A suppressor is really the secret that the OP needs to capitalize on in my opinion. The SAUM would be a decent choice if you NEED to trade some performance for some recoil, but I chose to add a couple pounds (9 lb bare, 11 lbs configured as I hunt with it) mostly to aid in shootability, and because I don’t mind carrying 11 lbs around. I am fairly recoil sensitive, and my Ultra 7 suppressor is golden ticket for success in my book. [/QUOTE]
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