6 Creedmoor - 115 DTAC HBN with H4350/Alpha LRP?

[Hunt]

Advice is appreciated here. I've looked around and haven't quite had my questions answered. I put a new 6 Creed Krieger 26" 7.5 twist (SAAMI chamber - Keystone Accuracy) on an Origin action. I've done some load development on new Alpha LRP brass and wanted input on what others are seeing with HBN DTACs. The barrel now has 140 rounds down the tube. Components are:

- Alpha LRP
- CCI 200s
- H4350
- 115 DTAC HBN with Nosering

41.5 gr		41.6 gr		41.7 gr
2.199 BTO	2.179 BTO	2.199 BTO	2.179 BTO	2.199 BTO	2.179 BTO
2976​	3006​	3022​	3029​	3060​
	2995​	3026​	3026​	3033​	3029​
2994​	3019​	3028​	3024​	3026​	3034​
2993​	3028​	3034​	3013​	3023​	3022​
2986​	3007​	3021​	3014​	3037​	3045​
18.0​	33.0​	13.0​	16.0​	37.0​	23.0​
2987.3​	3011.0​	3026.2​	3021.2​	3035.8​	3032.5​
8.3​	12.7​	5.2​	7.3​	14.6​	9.7​

With that said, 41.6 gr appears to be the node when testing at 300 yards. My question is this....Is the 41.6 gr load too hot and is this a node others are seeing for same length barrel? During my last range session, this load was only running around 2,985. It's hard for me the barrel sped up ~40 fps for same conditions from the prior range session.

 

[jakelly]

Cartridge?

 

[Dobbs02si]

Guessing 243 by the charge weight?

 

[jakelly]

I think 6 Creedmoor.

 

[Hunt]

I apologize....6 Creedmoor

 

[acourvil]

With the disclaimer that I have never used Alpha brass, I would say that is a moderately hot load but not so hot I would worry about it unless you will be shooting in noticeably warmer temperatures later. But I would also re-check your speeds up to around 250 rounds through the barrel. While I think at 150 rounds most of the speed-up will have happened, I have had barrels that kept increasing fps up to 200-250 rounds.

Getting a 40 fps increase in speed in that range of use doesn't sound unusual to me, but it's always good top re-check just to make sure that it was something unusual about the circumstances that day.

 

[Hunt]

What nodes are everyone else using with a 26" barrel and Alpha brass?

 

[4O6shootist]

A powder node that you're attempting to be in, should hold no more than 25es between the 0.2gr spread(if you're actually seeking a powder velocity node). You're seeing as much as 45-50 there. Or are you using the vertical spread nodes at distance? Ive found sometimes as much as a 0.4gr spread of powder(with es of 30-40 in between) that will hold 1" or less of vertical dispersion at 500y. This is how I typically load. Look for a charge range that holds tight vertical at distance. Then I test inside of that for what holds best ES. Then tune the seating depth if conventional, or adjust the barrel tuner to shrink group sizes.