Magnafluxing a Part to Determine Its Strength - Page 2
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Magnafluxing a Part to Determine Its Strength


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Old 12-20-2011, 09:28 AM   #11
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Originally Posted by jd45 View Post
Dan, before I seated the bullets in the cases for each of the three charge weights, I looked into the mouths of all 5 cases for each charge, to make sure that after I poured each weighed charge in the level was the same. I'm thinking I reached a critical point pressure-wise with that weight bullet & the burn rate of that powder that was over the safe limit. I don't think I'd've had the same result if the bullet weight had been say, 200grs, instead of 250. I'd be interested to hear your thoughts on it. Thanx, jd45
I'm glad you clarified that. Just wanted to make sure that the scale did not slip up.
Did you find the charge that works with your firearm?
I've seen where people work up max loads and never consider that a lower load will (sometimes) produce better results in accuracy.


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Old 12-20-2011, 01:14 PM   #12
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Dan, the 9.0gr load was real close to factory velocity , as I said in the 870s, however I didn't load enough to also test for accuracy at that time. When spring comes around I'll have enough ammo stored up to see how it shoots. It's an outdoor range. Thanx, jd45


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Old 12-28-2011, 01:25 PM   #13
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Pressue is not always linear. Add some powder, get an increase in velocity. Add a little more get some more velocity, or get a LOT more velocity (and pressure). Pressure spikes happen. That is why you are well advised to not exceed book maximums and approach those maximums cautiously.
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Old 12-29-2011, 12:27 AM   #14
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I think you hit the nail squarely on the head........pressure spike is apparently just what it was. I was in uncharted waters going a full half grain past the 9.0 charge. I just thank God I didn't blow the gun up or injure someone. Thanx, jd45
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