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Post by Kyle on Sept 4, 2017 10:20:39 GMT -5
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AJ
Full Member
Meatasarus
Posts: 182
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Post by AJ on Sept 4, 2017 10:41:36 GMT -5
Impressive! What is the BC of the bullet?
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Post by Kyle on Sept 4, 2017 10:52:16 GMT -5
Impressive! What is the BC of the bullet? The estimated BC's at sea level, standard temp and pressure are: 225gr .320 250gr .360 275gr .410
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Post by nyhunter on Sept 4, 2017 12:08:50 GMT -5
Looking good !!!
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Post by Kyle on Sept 4, 2017 13:57:48 GMT -5
One thing that I left out on the original post is that no two groups shot by Jerry this morning were identical in loading. Three different powders were shot with and without wool wads. All groups were shot with direct ignition LRMP. These results look very promising and I look forward to further load development with small increases in powder to find the ever elusive node.
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Post by dennis on Sept 4, 2017 14:46:57 GMT -5
Impressive results and shootin'.
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Post by hillbill on Sept 4, 2017 17:16:48 GMT -5
I'm excited, my bolt gun should be ready in a week or two, it will be hungry! A 275 @ close to 3000 FPS should be one bad Hombre'
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Deleted
Deleted Member
Posts: 0
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Post by Deleted on Sept 4, 2017 18:24:38 GMT -5
To give a little clarity to the pics Kyle displayed, I will try to list the chain of events. Note: All pressures except one are over 50kpsi and most are over 55kpsi. Until I pressure test them, I do not feel comfortable disclosing them. All loads were on one of two nodes. We only had 25 bullets and wanted to try several different loads and powders so NO tuning was done. We simply used loads that I calculated in QL and went with it.
We started with a clean bore. I shot 3 Barnes 300gr TSX over IMR4831 to foul the bore. Then we sized bullets to fit.
We changed powders and shot the group in the 3rd pic without a wad. The high shot was the first after the powder change. The group in the 4th pic was shot with the same charge but with a wool wad and produced a .406" group at 3070fps avg.
We then changed loads but NOT powder to hit a higher node and shot the group in the 2nd pic without a wad with a .411" group at 3401fps avg. (Kinda like the small block version of Cyclops) The group in the 1st pic was shot with a wool wad.
The load was changed again in the 5th pic with a wad that grouped .774" at 2974fps avg.
The 6th pic is under 50kpsi so I will list it as being 75gr of IMR3031 with a wool wad. I have no doubt that it can be tuned to be very accurate too. +
Overall. ALL loads show promise but some surprised us at how well they shot with no tuning at all. These bullets are the real deal and with an experienced marksman behind the trigger, the sky is the limit. I've also got a feeling that Rock Creek barrels will be getting a lot of calls. Thanks Kyle for everything.
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Post by hillbill on Sept 4, 2017 19:51:45 GMT -5
Rock Creek builds a great barrel without a doubt, I'm on my third and they spin very true after being cut off,all three, that says something for bore straightness, so far two shoot very well, the third I have no doubt will do the same.
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Post by schunter on Sept 5, 2017 8:28:08 GMT -5
Nice shooting Jerry even for testing a new bullet. Cant wait for the pressure testing!
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