178hpbt load data confusion

[hardnosestreetcop]

69Gen1 another option is to use Hodgon’s data for the 180 Gr load data for Varget with the 178 Gr BTHP. The difference in bullet weight is 1.11%. The max is 45 Grains, reduce by 10% = 40.5, work up from there and fine tune your OAL.

[Ted_Feasel]

69Gen1 another option is to use Hodgon’s data for the 180 Gr load data for Varget with the 178 Gr BTHP. The difference in bullet weight is 1.11%. The max is 45 Grains, reduce by 10% = 40.5, work up from there and fine tune your OAL.Varget is definitely not a bad choice, I think for 26" 308 I may try something a little on the slow burn end but every rifle is unique:)

Sent from my SM-N975U using Tapatalk

[Robinhood]

Nothing substitutes load workup. There is a high probability that your rifle will fall in line with the majority of other rifles vibration node. Thinner barrels have narrower node frequencies as do longer barrels. Fatter and shorter have broad exit nodes. All of that is due to harmonics. I have found that a 308 case can find a wide node by using .03 grain increments. Do .04 if you like. when you find three loads with the same point of impact at 2 or 3hundred yards you are golden. If you want precision your neck tension and case weights will need to be close as will the accuracy of your powder throws. Low neck(<.002) and bullet runout(<.002-.003)@ the ogive is imperative. More trigger time equals better test results. You got this!

[bigedp51]

Getting set to start working a 178hpbt load up in my 12fv 308 with varget looking thru the data sources I have they seem to be alot of variance. 1 of my oldest hornady book list 32 to 43.2@2500 newer hornady book 35 to 42.4@2450 with a oal at 2.800 Sierra book says 36.3 to 41.7 @ 2500 with 26" barrel for there 175 hpbt Hodgen load data center list the the sierra 175 at 42 to 45 @2690 I under stand the 178hpbt is not the 175 sierra but the hodgen data seems closer to what I see most people useing trying to narrow down a good start charge to work up.im shooting the 168 amax at 43.5 varget for around 1/2" moa at 100 with the ogive at 1.263 ..thanks to all

Variances in Load Data — Why Load Manuals Don’t Always Agree

http://bulletin.accurateshooter.com/2019/12/variances-in-load-data-why-load-manuals-dont-always-agree/

[Ted_Feasel]

Variances in Load Data — Why Load Manuals Don’t Always Agree

http://bulletin.accurateshooter.com/2019/12/variances-in-load-data-why-load-manuals-dont-always-agree/They are all just starting points, they all use different recievers, brass, barrels and there could very well be lot differences in the powders used. I always cross reference 3 sources at least, lyman, hornady, sierra and usually hogdon and I'll re take the 3 lowest nodes and start with the one closest to middle.. example, let's say for 308 win, one manual says starting load is 38gr, one says 36gr another say 39gr, I'll use 38gr as my starting node then load in .5 gr increments towards max. When I find the node where I start seeing spread below it and above it, I take that node and load below and above in .2 gr increments.. I reckon some may say that's going to far but I've always found the node that way.. sometimes i didnt find the node with the powder I was using. If your going 26" barrel 308 w/175gr smk then varget, w748, h4064.. one of the medium/medium-slowers should get you there.. just my 2 cents

Sent from my SM-N975U using Tapatalk