Optimizing powder choice to bearing length

[rimfiremac]

Hi all,

I'm gearing up to load for Hornady's new 175 ELDX in 7mm out of an 8 twist straight 284. I have successful loads in 162 amax and 190 Matrix using H4350 and RL17 respectively. I noticed (via notes on LRH) that the 175 ELDx has a longer bearing surface than any of its competitors, including the 190 Mtrix or old 175 XLD.

Does anyone have specific experience with running slower powders to compensate for longer bearing surfaces? In this case, I'm considering H1000, which is usually thought to be too slow for the straight 284.

 

[Zero333]

Stay with the powder that already works for you in the same bullet weight.

Longer bearing surface can also mean you might have to seat the bullet deeper in the case to avoid jamming it in the lands, therefore you can't take adventage of a slower powder if now you have less capacity to begin with.

H-4831/H-4831sc would be my first choice for this combo.

 

[rifleman700]

Stay with the powder that already works for you in the same bullet weight.

Longer bearing surface can also mean you might have to seat the bullet deeper in the case to avoid jamming it in the lands, therefore you can't take adventage of a slower powder if now you have less capacity to begin with.

H-4831/H-4831sc would be my first choice for this combo.

+1. Very good advice.

I would also add RL26 as a good powder.

 

[ShootDots]

H4831 or the SC version, are excellent for this cartridge. However, there is an often overlooked powder that is EXCELLENT in this cartridge also, especially using heavy bullets with L-O-N-G bearing surfaces. The powder is IMR 7828 or the SSC version. My choice being the SSC version, for easier metering thru a measure. This powder is pretty temp stable, burns clean and produces excellent accuracy, and normally, superior velocities! Give it a try, I doubt you will be disappointed!

 

[rimfiremac]

Sounds great then- I'll stick with what I used, and try 7828ssc also.

 

[Terry Altom]

H4831 or the SC version, are excellent for this cartridge. However, there is an often overlooked powder that is EXCELLENT in this cartridge also, especially using heavy bullets with L-O-N-G bearing surfaces. The powder is IMR 7828 or the SSC version. My choice being the SSC version, for easier metering thru a measure. This powder is pretty temp stable, burns clean and produces excellent accuracy, and normally, superior velocities! Give it a try, I doubt you will be disappointed!

Have you ever tried 7827sc with a 260AI?

 

[ShootDots]

Have you ever tried 7827sc with a 260AI?

Yes Sir I have! In my first barrel it turned in 2970f.p.s. with the Berger 140 Hybrids. But the accuracy was not up to H4350. I have not tried it in my 2nd barrel so far. I will, I just have not had a chance to test it.. But it should be a GREAT powder in the right barrel..

 

[rimfiremac]

I have a 6.5x55SE barrel that shoots 7828ssc very well with 139 Scenars. Case capacity to the AI should be very close.

 

[Terry Altom]

Since I also shoot a Dasher, it looks like it would be wise to sock up on H4350 before November.