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Rifles, Reloading, Optics, Equipment
Reloading
Experiences with high overbore cartridges and powder bridging
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<blockquote data-quote="esshup" data-source="post: 2139226" data-attributes="member: 11101"><p>The "go to" powder for the 7mm Allen Magnum was WC872 (a flattened ball powder) with the heavier bullets (175-200 grain) and no bridging issues with that, BUT I noticed that it was VERY temp sensitive, as in the colder it got the slower it went. I didn't run it over the chronograph, but I zero'd the gun at 6,000' elevation and 40°F, then 2 days later during the hunt the temps dropped to below zero. I had shot the gun from 300 yd to 1400 yd to develop a drop chart at 6,000'/40°F. At -8°F and 5,000' elevation the bullet, at 700 yds, was impacting 2 moa low. That's why I went away from the WC872.</p><p></p><p>I first started with RL-33, but couldn't seem to get the velocity without pressure signs with a 180 or 195g bullet, so I switched to RL-50. Velocity picked up with out showing signs of pressure 195g bullet and RL-33, 3084 fps was what I could get without having signs of pressure. With the same bullet and RL-50, I was able to push it 3250 fps before I saw pressure signs, 3225 was the accuracy node.</p><p></p><p>I can't give any info on bridging issues with the RL-50, I haven't shot enough rounds to come to a conclusion, less than 20. Kirby said he didn't have any bridging issues with the RL-33 in the 7mm AM, but did with RL-50.</p></blockquote><p></p>
[QUOTE="esshup, post: 2139226, member: 11101"] The "go to" powder for the 7mm Allen Magnum was WC872 (a flattened ball powder) with the heavier bullets (175-200 grain) and no bridging issues with that, BUT I noticed that it was VERY temp sensitive, as in the colder it got the slower it went. I didn't run it over the chronograph, but I zero'd the gun at 6,000' elevation and 40°F, then 2 days later during the hunt the temps dropped to below zero. I had shot the gun from 300 yd to 1400 yd to develop a drop chart at 6,000'/40°F. At -8°F and 5,000' elevation the bullet, at 700 yds, was impacting 2 moa low. That's why I went away from the WC872. I first started with RL-33, but couldn't seem to get the velocity without pressure signs with a 180 or 195g bullet, so I switched to RL-50. Velocity picked up with out showing signs of pressure 195g bullet and RL-33, 3084 fps was what I could get without having signs of pressure. With the same bullet and RL-50, I was able to push it 3250 fps before I saw pressure signs, 3225 was the accuracy node. I can't give any info on bridging issues with the RL-50, I haven't shot enough rounds to come to a conclusion, less than 20. Kirby said he didn't have any bridging issues with the RL-33 in the 7mm AM, but did with RL-50. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Experiences with high overbore cartridges and powder bridging
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