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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Looking for insight on blown primers
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<blockquote data-quote="tmoxley" data-source="post: 2864032" data-attributes="member: 107288"><p>Hi all,</p><p>I have a Savage MSR 10 Long Range (AR-10 style platform) chambered in .308 which I have been very pleased with. I am not a handloader but I did decide to try out a wide variety of ammo in the rifle to see what it liked best. I settled on IMI systems 7.62mm Semi-Auto Match 168 gr Razor Core because it seemed to group the best. It was always my understanding that 7.62 x 54 mm was safe to fire in a .308 rifle.</p><p></p><p>I have been running this ammo for the past few years and have experienced some issues. Some rounds blow the primers out and I find the separated case and primer on the ground after the round has cycled. Some rounds the rifle rips the rim off the cartridge during the extraction and ejection. Neither of these occurances were consistent, but both would occur at least once every range trip. I thought the issue may have been related to overpressure in the gas system so I turned the adjustable gas block down to one notch above "not cycling". This has not fixed the issue.</p><p></p><p>I ran FGMM 168 gr .308 through the rifle last weekend and did not experience a single issue.</p><p></p><p>I have attached a picture of the IMI with ripped cartridge rim, and a picture of the FGMM from last weekend. Unfortunately I forgot to save any cartridges with blown primers to post. None of the rounds show any bulging or disfigurement aside from what has been noted.</p><p></p><p>I am looking for any information that will help me understand what the issue with the IMI ammo is and if it can be mitigated or if I need to stick to other ammo in the rifle.</p><p></p><p>Thanks for your help![ATTACH=full]479547[/ATTACH]</p></blockquote><p></p>
[QUOTE="tmoxley, post: 2864032, member: 107288"] Hi all, I have a Savage MSR 10 Long Range (AR-10 style platform) chambered in .308 which I have been very pleased with. I am not a handloader but I did decide to try out a wide variety of ammo in the rifle to see what it liked best. I settled on IMI systems 7.62mm Semi-Auto Match 168 gr Razor Core because it seemed to group the best. It was always my understanding that 7.62 x 54 mm was safe to fire in a .308 rifle. I have been running this ammo for the past few years and have experienced some issues. Some rounds blow the primers out and I find the separated case and primer on the ground after the round has cycled. Some rounds the rifle rips the rim off the cartridge during the extraction and ejection. Neither of these occurances were consistent, but both would occur at least once every range trip. I thought the issue may have been related to overpressure in the gas system so I turned the adjustable gas block down to one notch above "not cycling". This has not fixed the issue. I ran FGMM 168 gr .308 through the rifle last weekend and did not experience a single issue. I have attached a picture of the IMI with ripped cartridge rim, and a picture of the FGMM from last weekend. Unfortunately I forgot to save any cartridges with blown primers to post. None of the rounds show any bulging or disfigurement aside from what has been noted. I am looking for any information that will help me understand what the issue with the IMI ammo is and if it can be mitigated or if I need to stick to other ammo in the rifle. Thanks for your help![ATTACH type="full"]479547[/ATTACH] [/QUOTE]
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Looking for insight on blown primers
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