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Rifles, Reloading, Optics, Equipment
Gunsmithing
Excess headspace - Win M70 30-06 pre-64
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<blockquote data-quote="Stammster" data-source="post: 1942668" data-attributes="member: 114381"><p>I purchased a 1961 Winchester Model 70 pre-64 FWT in 30-06 last year off gun broker. The gun is in great shape. However after closer inspection, I came to find out the bolt serial number does not match the gun.</p><p></p><p>I shot some factory ammo through it, and depending on the brand, it grouped anywhere from 0.8" to 2.5" at 100 yds. Kind of in line with my expectations.</p><p></p><p>I was going to work up a hand load to see if I could do a little better. I measured my fired cases with a Hornady comparator and realized they were very long. In fact they read 2.055". For reference, my go gauge marked 2.0487" reads 2.0425" with the same 0.375" collet. By my math, that puts me at a chamber length of 2.061", which is over SAAMI max length by 0.0025"-0.003".</p><p></p><p>I had no soot blow by around any of the neck of the factory ammo I shot (qty approx 30). Each round was individually chambered rather than fed through the mag well, so I don't think the controlled feed had any influence. I measured a few of the unfired remaining shells from the various 20 rd packs, and they came in at 2.040-2.041" on my comparator.</p><p></p><p>Now the questions I have:</p><p>1.) Is it truly unsafe to keep shooting factory ammo in this gun? Personally I don't think so.</p><p>2.). If I reload, and only bump the shoulder back 0.002" from 2.055", this to me now brings the tolerance of "case to chamber" well within the acceptable limit of any commercial cartridge. I don't see anything wrong with this approach and will dedicate a string of brass to this gun only. It's a hunting gun, so round count will be <20 per year. Also I see this as no different then those who fire form brass for 30-06 variations like the 30-06 AI or 30 Gibbs, and blow the necks out. Am I wrong here?</p><p>Seems to me the previous owner may have inadvertently created a wildcat when they swapped out the bolt. Maybe this will work to my advantage for more powder capacity.</p><p></p><p>It just doesn't make financial sense for me to have a gunsmith set the barrel back at this time, in order to shorten the headspace. Also I am not very optimistic I could find a replacement bolt to correct the problem.</p><p></p><p>Another other suggestions?</p><p></p><p>Thanks.</p></blockquote><p></p>
[QUOTE="Stammster, post: 1942668, member: 114381"] I purchased a 1961 Winchester Model 70 pre-64 FWT in 30-06 last year off gun broker. The gun is in great shape. However after closer inspection, I came to find out the bolt serial number does not match the gun. I shot some factory ammo through it, and depending on the brand, it grouped anywhere from 0.8” to 2.5” at 100 yds. Kind of in line with my expectations. I was going to work up a hand load to see if I could do a little better. I measured my fired cases with a Hornady comparator and realized they were very long. In fact they read 2.055”. For reference, my go gauge marked 2.0487” reads 2.0425” with the same 0.375” collet. By my math, that puts me at a chamber length of 2.061”, which is over SAAMI max length by 0.0025”-0.003”. I had no soot blow by around any of the neck of the factory ammo I shot (qty approx 30). Each round was individually chambered rather than fed through the mag well, so I don’t think the controlled feed had any influence. I measured a few of the unfired remaining shells from the various 20 rd packs, and they came in at 2.040-2.041” on my comparator. Now the questions I have: 1.) Is it truly unsafe to keep shooting factory ammo in this gun? Personally I don’t think so. 2.). If I reload, and only bump the shoulder back 0.002” from 2.055”, this to me now brings the tolerance of “case to chamber” well within the acceptable limit of any commercial cartridge. I don’t see anything wrong with this approach and will dedicate a string of brass to this gun only. It’s a hunting gun, so round count will be <20 per year. Also I see this as no different then those who fire form brass for 30-06 variations like the 30-06 AI or 30 Gibbs, and blow the necks out. Am I wrong here? Seems to me the previous owner may have inadvertently created a wildcat when they swapped out the bolt. Maybe this will work to my advantage for more powder capacity. It just doesn’t make financial sense for me to have a gunsmith set the barrel back at this time, in order to shorten the headspace. Also I am not very optimistic I could find a replacement bolt to correct the problem. Another other suggestions? Thanks. [/QUOTE]
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Excess headspace - Win M70 30-06 pre-64
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