Long range load development at 100 yards.

[Kurt Blasser]

looks like you have a node worth exploring between 42.2-42.8. I would do seating depth testing at 42.5.

Thanks! I already loaded a seating depth test at 42.8. I'll also try 42.5!

 

[Hollywood]

Thanks! I already loaded a seating depth test at 42.8. I'll also try 42.5!

Your 42.8 is a good group with low SD, but if you look at POI group center of 42.8, 43, and 43.2, they are quite different. There is minimal vertical displacement between 42.2-42.8. That's why I suggest exploring 42.5. It took me many many times reading and examining other target post and suggestions from people to understand what I was looking for. It is not just the smallest group with the smallest SD. Good luck and post results. This thread should no die off; it has good info in it.

 

[Kurt Blasser]

I agree, this thread should continue. Great information. Appreciate the help. I see the rationale. Seating test of the 42.8 done today posted below. I'll work up a test for the 42.5's. This is 42.8 gn of Varget, 185 Jugs, jam is at 2.248, started .005 off and every .003 thereafter.

 

[Hollywood]

I agree, this thread should continue. Great information. Appreciate the help. I see the rationale. Seating test of the 42.8 done today posted below. I'll work up a test for the 42.5's. This is 42.8 gn of Varget, 185 Jugs, jam is at 2.248, started .005 off and every .003 thereafter.

-.017 looks like the ticket on that charge weight. Now on to the next step.

 

[Kurt Blasser]

That also corresponds to the foulers at 2.230 -.018 which after the cold bore shots tightened up nicely on both sheets one and three. As an aside, these were shot on 5x fired lapua brass, full length sized. It looks like the neck tension I had was resized unloaded neck OD diameter .328, loaded neck OD .334-.3345. Too tight? New brass make a difference?

 

[Erik Cortina]

Load seating depth at 2.228" and shoot a powder test again. Go from 42.5 to 43.4 in .3 increments.

 

[Kurt Blasser]

Thanks Erik!

 

[Joe R]

ttt

 

[Kurt Blasser]

Load seating depth at 2.228" and shoot a powder test again. Go from 42.5 to 43.4 in .3 increments.

Here's the powder test as above.

 

[Kurt Blasser]

Here's the powder test as above.

And started to workup a .223 load with Berger 82 gn, and Varget, seating depth -.020 at 1.890

 

[seymour fish]

And started to workup a .223 load with Berger 82 gn, and Varget, seating depth -.020 at 1.890

Kurt, 223 as you would expect, and evidence shooter is good. 308 should have easily found a repeatable reasonably wide node by now. Has it previously shot well? Usual questions: round count, twist, firing setup, brass internal volume measured, different primers tried, etc. Seymour

 

[Kurt Blasser]

And started to workup a .223 load with Berger 82 gn, and Varget, seating depth -.020 at 1.890

Kurt, 223 as you would expect, and evidence shooter is good. 308 should have easily found a repeatable reasonably wide node by now. Has it previously shot well? Usual questions: round count, twist, firing setup, brass internal volume measured, different primers tried, etc. Seymour

Hawks Hill 29" 1/10 heavy palma contour. 450 rounds, lapua now fired x5, remington large rifle primers. On page 96 I posted two other series of jugs, one .4 apart, and one .2 apart and a seating test.

 

[seymour fish]

Hawks Hill 29" 1/10 heavy palma contour. 450 rounds, lapua now fired x5, remington large rifle primers. On page 96 I posted two other series of jugs, one .4 apart, and one .2 apart and a seating test.

Typically find a rough node across at least a grain of powder, preferably 1.5 grains in 308 on a one shot/0.3 gr incremental change ladder. Then at least a 0.4 gr, preferably a 0.6 gr wide node using 0.1 gr incremental change, testing the center of that rough node, which should give a waterline re vertical dispersion at 100 yd, using a seating depth chosen based on body of info on the Jugg, say .015 Off. That not being the case here, and with Juggs being generally regarded as easy to tune, and assuming no mechanical issues with rifle, rest, tracking, balance, consider H4895 and Tula/wolf vs fed vs CCI primer

 

[Kurt Blasser]

Typically find a rough node across at least a grain of powder, preferably 1.5 grains in 308 on a one shot/0.3 gr incremental change ladder. Then at least a 0.4 gr, preferably a 0.6 gr wide node using 0.1 gr incremental change, testing the center of that rough node, which should give a waterline re vertical dispersion at 100 yd, using a seating depth chosen based on body of info on the Jugg, say .015 Off. That not being the case here, and with Juggs being generally regarded as easy to tune, and assuming no mechanical issues with rifle, rest, tracking, balance, consider H4895 and Tula/wolf vs fed vs CCI primer

Thanks Seymour! I'll try the ladder.

 

[08glide]

I decided to give this a go today (top row of stickers...second row was just a seating depth test with another rifle. Loads were getting fairly warm from 43.9 to 44.2. Any suggestions Erik?

 

[seymour fish]

42.7 across to 43.6 show roughly same elevation, and a reasonably wide rough node. Try 3 shots each, in 0.1 gr increments, from 43.2 to 43.7, double checking that they all hold same vertical, and expecting some tight groups. Take the best 2-3 charges from this tesT and test seating depths in 0.003" increments in and out, more if you require tighter groups and have the time. You should expect the result of this to give a load that does ok at 1000. Seymour

 

[08glide]

Thanks for your response Seymour, I will give that a try.

 

[AR Shooter]

'thread follower' post.

 

[Nature Boy]

Ok, here's my attempt using the OPs method. Would like some feedback. Trying to find the magic in my .308 using 185 Juggernauts and Varget. Charge weight notes on top and group distance from vertical on bottom. No chrono data. Light at the range today was throwing off some strange numbers

If I understand this method correctly, the two contiguous groups with closest distance to vertical is the node. Would that be #4 and #5 or #5 and #6?

Or maybe #3 and #4?

 

[Kurt Blasser]

Ok, here's my attempt using the OPs method. Would like some feedback. Trying to find the magic in my .308 using 185 Juggernauts and Varget. Charge weight notes on top and group distance from vertical on bottom. No chrono data. Light at the range today was throwing off some strange numbers

If I understand this method correctly, the two contiguous groups with closest distance to vertical is the node. Would that be #4 and #5 or #5 and #6?

Or maybe #3 and #4?

Between 4 and 5 would be my guess, but I'm trying to do the same thing.