jefats
.30 Stingray
Posts: 309
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Post by jefats on Jan 9, 2016 20:31:09 GMT -5
Came into some 350 WFNGC (.512") by Cast Performance and want to use them in the 500 Linebaugh. 400 grainers seem to be the lightest bullets listed in load data info. Appreciate any info ya'll can give. Thanks
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Post by whiterabbit on Jan 11, 2016 19:11:18 GMT -5
I have no info, but I have advice. This advice comes from a guy who developed many loads for 460 S&W after finding that there was no useful load data other than ONE load with 500 grain cast bullet with lilgun only, everything else was jacketed bullets like XTP MAG and barnes.
Extrapolation works. In fact, if you extrapolate commercial load data, it's perfectly linear (leaves little imagination as to where the data comes from).
So what I would do, is take your load data for any GC bullet with the powder you want to use and plot it (try to use similar pressure loads if that info is available). Draw a line. See if best fit is linear, use excel to come up with a y=mx+b equation, and use that to plug in 350 for y and calculate x, your powder charge.
YES we all understand pressure curves are not linear with powder charge at the extreme range of charge weights. This is why you look at that number and start the thought experiments to see if the number makes any sense, measure a case charged and see if the bullet is anywhere near the powder level, etc. look for any red flag you can find. If no red flags present themselves, try the load, or download a little and try it.
worked for 460 S&W. Worked real well, in fact.
I hope someone is able to give you some load data. Sure is easier.
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Post by whiterabbit on Jan 11, 2016 19:11:36 GMT -5
Another thought, why not use 500 JRH data? the case is darn near the same thing? www.beartoothbullets.com/tech_notes/archive_tech_notes.htm/69This guy says a ton of H110 left cases sooty (as in, not enough pressure to seal on the chamber?) after almost 1500 fps with a 350 grain bullet. That almost implies you can go up in charge and get 1550 or more. If I were in your situation (and thinking about H110), then I'd be inclined to measure powder to case mouth, look at some JRH cases vs linebaugh cases, see if I could find the waterweight capacity of each, and if it all made sense, take 2 grains off the powder, use a mag primer, and push the bullet so the base was sitting right on the powder (air in case = no-no with H110), and trying it.
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jdoc
.327 Meteor
Posts: 727
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Post by jdoc on Jan 11, 2016 19:55:02 GMT -5
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jdoc
.327 Meteor
Posts: 727
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Post by jdoc on Jan 11, 2016 20:00:24 GMT -5
Data for 500 Linebaugh on last page. Looks to me data is for your exact bullet.
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jefats
.30 Stingray
Posts: 309
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Post by jefats on Jan 11, 2016 23:44:10 GMT -5
Great info all. Thanks much.
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