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Rifles, Reloading, Optics, Equipment
Reloading
pierced primers
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<blockquote data-quote="roadhunter" data-source="post: 370669" data-attributes="member: 13886"><p>Question - Can a muzzle break cause changes in chamber pressures?</p><p> </p><p>I went to the range the other day and shot my Rem 700 P chambered in 300 Win Mag. The rifle has a 25" barrel thats threaded 5/8-28 with thread a protector. I picked up a used muzzle break that a guy had on a different 30 cal 700P. So I figured I'd give it a try.</p><p> </p><p>300 Win Mag</p><p>210 Berger VLD</p><p>CCI 250 </p><p>80gr H1000</p><p>COL 3.612"</p><p> </p><p>I'm shooting the above load and with the thread protector I'm getting about 2960fps. It's a little hot but no sticky bolt lift or super flat primers. I then tried the same load with the muzle break screwed on. WOW! I got some powder blast back in my face and eyes, and velocity shot up to over 3100FPS (that's 300RUM velocities)! I had to try one more round to make sure it wasn't just some lazy reloading (this time I stood back and shot from the hip). It did it again. The primers on both rounds were pierced.</p><p> </p><p>So, I took off the muzzle break and put the thread protector back and shot a couple more. Everything was fine. </p><p> </p><p>Anyone every have this happen? I always assumed what was safe without a break, would also be safe with one......</p><p> </p><p><img src="http://i718.photobucket.com/albums/ww185/roadhunter_bucket/IMG_0172.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p> </p><p><img src="http://i718.photobucket.com/albums/ww185/roadhunter_bucket/IMG_0176.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="roadhunter, post: 370669, member: 13886"] Question - Can a muzzle break cause changes in chamber pressures? I went to the range the other day and shot my Rem 700 P chambered in 300 Win Mag. The rifle has a 25" barrel thats threaded 5/8-28 with thread a protector. I picked up a used muzzle break that a guy had on a different 30 cal 700P. So I figured I'd give it a try. 300 Win Mag 210 Berger VLD CCI 250 80gr H1000 COL 3.612" I'm shooting the above load and with the thread protector I'm getting about 2960fps. It's a little hot but no sticky bolt lift or super flat primers. I then tried the same load with the muzle break screwed on. WOW! I got some powder blast back in my face and eyes, and velocity shot up to over 3100FPS (that's 300RUM velocities)! I had to try one more round to make sure it wasn't just some lazy reloading (this time I stood back and shot from the hip). It did it again. The primers on both rounds were pierced. So, I took off the muzzle break and put the thread protector back and shot a couple more. Everything was fine. Anyone every have this happen? I always assumed what was safe without a break, would also be safe with one...... [IMG]http://i718.photobucket.com/albums/ww185/roadhunter_bucket/IMG_0172.jpg[/IMG] [IMG]http://i718.photobucket.com/albums/ww185/roadhunter_bucket/IMG_0176.jpg[/IMG] [/QUOTE]
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