More load data with H4895 in the 6mm Dasher

[dbduff]

Someone should do a direct comparison between h4895, AR Comp, and Imr 8208 because I think they are virtually identical velocity to charge weight in nearly all these 6mm cartridges.

I find Imr 8208 easier to meter. Bigger issue for me is temp insensitivity between 8208 and 4895. Also, H4895 speed seems to vary 8pound lot to lot, significantly. I like them both as they shoot small at 300 Yards in a 6 Brdx. But our range temps go 45 to 90 degrees plus over the season. Tuning and retuning can be a conundrum.
D

 

[urbanrifleman]

I find Imr 8208 easier to meter. Bigger issue for me is temp insensitivity between 8208 and 4895. Also, H4895 speed seems to vary 8pound lot to lot, significantly. I like them both as they shoot small at 300 Yards in a 6 Brdx. But our range temps go 45 to 90 degrees plus over the season. Tuning and retuning can be a conundrum.
D

Which is more temp sensitive?

 

[newbieshooter]

Someone should do a direct comparison between h4895, AR Comp, and Imr 8208 because I think they are virtually identical velocity to charge weight in nearly all these 6mm cartridges.

Tried it the other week. Same 6mm case, bullet, range session...etc:

32.7 gr 8208 XBR: 3193 fps
32.7 gr AR Comp: 3281 fps

YMMV....

 

[dbduff]

Which is more temp sensitive?

I can’t make a definitive statement on that yet. Neither stands out as “more” sensitive to temp change.

 

[Alex Wheeler]

James, I never found it to be that dirty. It responded well to normal cleaning methods and I never lost accuracy in a match due to fouling. I dont know why your experiencing that. It could be your lot? I assume your running it at a reasonable pressure?

 

[jamesdmock]

It is very dirty. Evidently, my lot has quite a bit of coating and it leaves a BLACK soot after only a few rounds. I have loaded up to 32.8 grains behind a 105 gr. Bart's bullet and behind a 105 Hybrid. I have used only 205M and CCI 400 primers....both fouled terribly. I am now using XBR and H4895 powder and neither show much fouling. Thanks, James

 

[Alex Wheeler]

Some powders with the anti fouling agents are very black on patches. RL16 is that way. But it doesnt bother me, I just clean them.

 

[BoydAllen]

Two questions about RL15: How many rounds before accuracy starts to fall off, and does its dirtiness correspond to a tendency to form hard carbon deposits? One more, how hard is the black to get out?

 

[jamesdmock]

Two questions about RL15: How many rounds before accuracy starts to fall off, and does its dirtiness correspond to a tendency to form hard carbon deposits? One more, how hard is the black to get out?

I haven't shot enough with Re15 in the Dasher to properly answer all of the questions you pose. I thoroughly clean and use a brush to get the carbon ring after each session....so I haven't seen the formation of the hard ring. The accuracy seems to fall off after about 25 rounds. I currently have my BRA barrel on, but I will give the Re15/Dasher another shot soon. Thanks, James

 

[johara1]

I shot a lot of RL-15 and never found it dirty but I was on the top end with 450's. If I remember right lower loads seemed dirty, high end seemed clean. Now Varget is dirty... jim

 

[ASbobcat]

I can’t make a definitive statement on that yet. Neither stands out as “more” sensitive to temp change.

Can't remember where I found this information, nor the methodology used to determine the data, but it may be helpful if one takes the information with a grain of salt.

Also can't remember the difference between the left and right columns. Maybe different temperature regimes?

Couldn't remember my name this morning either. Old age has it's issues.