178 BTHP using N140 [Archive]

supergolfer18

07-12-2013, 10:19 PM

Has no one ever used this combo? Or similar bullet? I have looked on the forums for a couple hours and have not found any info on it. :o

It has very similar burn rate to Varget and RL15. I can not find the Hornady data to show max anywhere online

Any help would be appreciated

earl39

07-12-2013, 11:47 PM

This might help. http://www.lapua.com/en/products/reloading/vihtavuori-reloading-data/relodata/5/70 It shows the 175 and the 180gr bullets. you should be able to work something out from there.

supergolfer18

07-12-2013, 11:57 PM

thanks I had seen that but I guess I will go with 42 as max and work up to that. Someone did run QL with my brass water weight and COAL I am using but we got way higher max load than 42 gr

44.6 was only at 62,000PSI

stangfish

07-13-2013, 01:21 AM

Similar to varget not just in burn rate but in properties.

supergolfer18

07-13-2013, 03:22 AM

that is what I was told by my gunsmith(who knows his stuff) and looking at burn rate charts. Appears to be same/similar to Varget/RL15

supergolfer18

07-14-2013, 08:27 PM

ladder test at 600 yards showed promise.

The low node that repeated itself 2 times. This was 3 different charge weights
http://i135.photobucket.com/albums/q138/astone6/IMG_20130713_151759_291.jpg (http://s135.photobucket.com/user/astone6/media/IMG_20130713_151759_291.jpg.html)

The higher node. Which was also 3 different charges(3rd charge was just below "7" in between the caliper jaws)
http://i135.photobucket.com/albums/q138/astone6/IMG_20130713_151638_468.jpg (http://s135.photobucket.com/user/astone6/media/IMG_20130713_151638_468.jpg.html)