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Post by boolitdesigner on Jan 6, 2018 19:07:29 GMT -5
Here you go Fermin...... the problem is obvious I think.  |
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Post by bushog on Jan 6, 2018 21:10:20 GMT -5
Science!
Doesn't the second groove back on the 311440 look like an alternate (or primary) crimp groove?
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Post by 2 Dogs on Jan 6, 2018 21:30:35 GMT -5
Science! Doesn't the second groove back on the 311440 look like an alternate (or primary) crimp groove? Certainly the Flying Fist could be seated out farther. And more H110 could be packed into the case. But there’s more than that at work here. Here, do the math: 32-20 case is 1.282” plus a .400” nose to crimp and OAL should be 1.682 yet when I measure a loaded round I get 1.668” which means two things. 1) I am compressing the powder and 2) I am also compressing my bullet by .014” I think... If you look at the Flying Fist, the HP cavity itself has heavier walls. Seems to be more able to withstand that “crush”. It’s not just the compressed powder column, the longer bearing surface of the Fist adds more friction thus more burn time... See where I’m going? |
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Post by Encore64 on Jan 6, 2018 21:43:25 GMT -5
Most 32-20 brass is well over 1.282". Starline is very short.
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Post by 2 Dogs on Jan 9, 2018 14:18:12 GMT -5
Most 32-20 brass is well over 1.282". Starline is very short. Me being about as tall as a garbage can, that hurts my feelings.... |
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Post by boolitdesigner on Jan 9, 2018 20:58:32 GMT -5
Science! Doesn't the second groove back on the 311440 look like an alternate (or primary) crimp groove? It is!Certainly the Flying Fist could be seated out farther. And more H110 could be packed into the case. But there’s more than that at work here. Here, do the math: 32-20 case is 1.282” plus a .400” nose to crimp and OAL should be 1.682 yet when I measure a loaded round I get 1.668” which means two things. 1) I am compressing the powder and 2) I am also compressing my bullet by .014” I think... No, you are compressing powder.... the 32-20 case would buckle long before you compress the bullet, providing it isn't dead soft.If you look at the Flying Fist, the HP cavity itself has heavier walls. Seems to be more able to withstand that “crush”. It’s not just the compressed powder column, the longer bearing surface of the Fist adds more friction thus more burn time... Heavier bullet with less powder room.... essentially a smaller cartridge. Apples and oranges! Keep the case capacity (the actual capacity to the bullet base) in mind while you're analyzing things.See where I’m going? Try analyzing the 444 Marlin case this way and see where it goes. The ballistics are well known for it... as well as optimum weight for maximum energy. |
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Post by boolitdesigner on Jan 17, 2018 15:23:02 GMT -5
OK, it has occurred to me that I'm wrong..... Fermin can and did crush a bullet seating it. Now, here is a possible solution:  That new bullet is the "308 Hunting Bullet" and is a few grains heavier than the 312440. |
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