6mm Creedmoor powders

[Joel Dubose]

It just hurts the accuracy. Like their 6.5grendel brass with the srp and .080 flash hole is useless in benchrest when compared to the small flash hole lapua has. Starline makes excellent brass but they lose probably 90%+ of their potential grendel customers just for that. With cases and rifles that you can actually see small changes just that little sinclair reamer that opens them up a couple thou will show on paper. Of course all the testing youre doing is half the fun right?

Sure. That's what I do. Sometimes it feels like in breeding. Lol

 

[Dusty Stevens]

Sure. That's what I do. Sometimes it feels like in breeding. Lol

Sometimes an education is costly and painful.

 

[mike a]

Ok guys, after a great deal of investigation here's where I stand. The RL23 seems to be to low in burn rate. The goal was to fill the case capacity to 100% with a burn rate that works for my 6mm Creedmoor. Here's what I have found and where I'm going with this at this point. Here's why I think that it's to slow. As I'm shooting the original problems where with fire cracking in the throat with H4350. I was only getting about 400 accurate rounds of barrel life. Moving forward I wanted to accomplish two things, 1) slower burning rate, bulkier powder that would fill the case for more efficient Extreme spread. 2) thought that the slower burn rate might also help with throat erosion and barrel life.
What it appears is happening is that it truly worked for Extreme spread, but it appears that its throwing unburned powder into the bore where it ignites. This is causing, excessive barrel heat, fire cracking spread out lightly over a larger area of the first few inches instead of extreme heat right on the lands. I like where this is going and what I've been finding however I now want to increase the burn rate in the case possibly taking away the extra heat generated in the barrel. Looking for a happy medium so to speak. The interesting thing when I look at the velocities, it's very good, high in fact. I spoke with the powder mfg, looking at this problem and spoke about RL26 which is an even slower burning powder. (This might explain the fps increase on the Rl26) the slower burning powder is burning slow enough that it's not clean also. The heat generated is farther down the barrel, so lots of carbon build up in the first few inches.
My focus is to stay the current coarse however speed up the burn rate. So here's my thoughts.
1) more seating pressure. .003 press instead of .002
2) start moving the bullet into the lands
3) possibly open the flash hole, any thoughts?
4) seat the CCI 450 primer farther forward towards the flash hole. This will be like adding spark advance and change the timing
If you have any thoughts on this topic , or experience please let me know. If you prefer, send me a private message.

OMG, 400 rounds of accurate barrel life!!! My first 6CM is almost finished!!! I was loading for my .243 until it shot COMPLETELY out at 1500. I have some H4350 and H414 that I was thinking of trying. I not fooling myself about 6CM barrel life as its not much different than the 243. But 400 round of accuracy! What kind of accuracy were you getting at 400 rounds?

 

[Joel Dubose]

Sometimes an education is costly and painful.

Always costly,

OMG, 400 rounds of accurate barrel life!!! My first 6CM is almost finished!!! I was loading for my .243 until it shot COMPLETELY out at 1500. I have some H4350 and H414 that I was thinking of trying. I not fooling myself about 6CM barrel life as its not much different than the 243. But 400 round of accuracy! What kind of accuracy were you getting at 400 rounds?

Average group at 1000 yards was 4", in good conditions less than 3" here's a recent group at 1000. I did a horrible job at the nationals, 7" group would have been good for the event from m . It was my own fault, I'm the guy who screwed myself up the night before.

 

[Joel Dubose]

OMG, 400 rounds of accurate barrel life!!! My first 6CM is almost finished!!! I was loading for my .243 until it shot COMPLETELY out at 1500. I have some H4350 and H414 that I was thinking of trying. I not fooling myself about 6CM barrel life as its not much different than the 243. But 400 round of accuracy! What kind of accuracy were you getting at 400 rounds?

It's more likely that I'm the one screwing up my barrels. Do ya own thing and dont worry about what's happening with me.

 

[fantastic]

Here's what I have been running:

6mm Creedmoor
24" Bartlein 1:8 twist, .183 freebore
Berger 105 Hybrids
Hornady Brass
CCI BR-2 primers
42.2 grains H4350 powder

Trim length of brass1.915
OAL 2.215 base to ogive

I'm getting 3060 fps, ES 18, SD 7.8

Tomorrow I am going to do some ladder testing with Alpha Munitions brass and Lapua brass, both necked down to 6mm.

 

[Joel Dubose]

Here's what I have been running:

6mm Creedmoor
24" Bartlein 1:8 twist, .183 freebore
Berger 105 Hybrids
Hornady Brass
CCI BR-2 primers
42.2 grains H4350 powder

Trim length of brass1.915
OAL 2.215 base to ogive

I'm getting 3060 fps, ES 18, SD 7.8

Tomorrow I am going to do some ladder testing with Alpha Munitions brass and Lapua brass, both necked down to 6mm.

That's perfect. I'm Curious to see what difference as you find in the brass. Srp versus lrp