XBR 8208 Burn rate?
- Thread starter X - Man
- Start date
Vihtavuori has it on their chart.
http://www.lapua.com/upload/reloading/reloadingburningratechart2011.pdf
http://www.lapua.com/upload/reloading/reloadingburningratechart2011.pdf
Forum Boss
Administrator
Looking at the VV chart they have it listed equivalent to N133. In my experience with IMR 8208 in 6BR, .308, and Dasher, it is considerably slower than N133, and is much closer to H4895. I can't prove that scientifically, but the 8208 load we were running with heavy 6mm bullets would be completely out of the question with N133. In the .308 with 155s it behaved very similar to H4895, and was a viable alternative to Varget with 155s (albeit with different recipes).
I would caution that you should start with starter loads on the Hodgdon website to be safe. I think IMR 8208 XBR, as it has evolved from the beginning to now, may have slowed down. Some of the PPC guys have been complaining that the current lots are slower and "less energetic" than the early batch releases.
I would caution that you should start with starter loads on the Hodgdon website to be safe. I think IMR 8208 XBR, as it has evolved from the beginning to now, may have slowed down. Some of the PPC guys have been complaining that the current lots are slower and "less energetic" than the early batch releases.
I shot through about 10 pounds of 8208, 8 of lot 81021094773 and 2 (so far) of lot 80826104881. Both developed similar velocities but I have no way of knowing where they fit in production history.
My load development indicates that both lots are close to H4895, maybe slightly faster. The powder is denser than either H4895 or Varget, allowing uncompressed charge weights that can reach dangerous levels. Approach heavy bullet loads in medium capacity cartridges carefully.
Similar to comments above, 8208 also works very well for me in .308 with 155-class bullets and in 6BR with Sierra 107 molys.
My load development indicates that both lots are close to H4895, maybe slightly faster. The powder is denser than either H4895 or Varget, allowing uncompressed charge weights that can reach dangerous levels. Approach heavy bullet loads in medium capacity cartridges carefully.
Similar to comments above, 8208 also works very well for me in .308 with 155-class bullets and in 6BR with Sierra 107 molys.
I have used two different lots of IMR 8208 XBR powder in one of my .17 Remingtons with hBN coated 25 gr. Hornady V-Max bullets. Bullets were seated .010" off the lands, Remington 7½ primers were used, casings used were formed to .17 Remington from WW .204 Ruger brass, and all powder charges were weighed on my Denver Instruments MXX-123 digital scale.
The first lot of powder I used was lot #10813094736 and I used 2 pounds of that. The next lot of powder I purchased was lot #10817104855 and I have only used one pound of that so far. The first lot of powder was giving me an average muzzle velocity of 3,996 fps with 22.8 gr. of 8208 pushing the 25 gr. V-Max bullets. The second lot of powder, using the same bullets and same weight powder charge, same seating depth, gave me an average muzzle velocity of 4,064 fps. The new lot of powder appears to be a bit faster burning, giving me an average of 68 fps more velocity than the old lot. Temperatures during these various test were very close to the same so I can't say that warmer temperatures were part of the reason for the increased velocity.
I have only tried two other powders with these bullets in this rifle and those were Varget and VVN540. Using the same casings, primers, hBN coated 25 gr. V-Max bullets and same seating depth I got an average muzzle velocity of 3,856 fps using 23.8 gr. of N-540 and an average muzzle velocity of 3,818 fps using 23.6 gr. of Varget. My tests over my chronograph testify that both of these powders are quite a bit slower burning than 8208 as listed on the IMR Burn Rate chart. In my limited tests it took from .8 gr. to 1.0 gr. more powder to ramp up to average velocities that are 140 fps to 178 fps slower than the 8208 powder. I never tried to match the 8208 velocities with either N-540 or Varget.
I also use IMR 8208 XBR and 39 gr. Sierra BlitzKing and 40 gr. Hornady V-Max bullets in one of my .204 Ruger rifles. I did a couple of tests using some H4895 with the 40 gr. V-Max bullets and in these limited tests, the IMR 8208 XBR appeared to give me just a tiny bit more velocity than H4895 with similar powder chage weights and all other variable being the same. This was a very limited test with only 10 shots fired with the 8208 and the 40 gr. V-Max bullets.
I am very pleased with the performance I am getting out of IMR 8208 XBR in both the .17 Remington and the .204 Ruger. I use the RCBS ChargeMaster 1500 to throw the initial powder charge and then weigh it on my DI MXX-123 digital scale. It flows nicely and fills the casings up close to the maximum volume I like to use and gives me the velocities I like without having to compress the loads.
The first lot of powder I used was lot #10813094736 and I used 2 pounds of that. The next lot of powder I purchased was lot #10817104855 and I have only used one pound of that so far. The first lot of powder was giving me an average muzzle velocity of 3,996 fps with 22.8 gr. of 8208 pushing the 25 gr. V-Max bullets. The second lot of powder, using the same bullets and same weight powder charge, same seating depth, gave me an average muzzle velocity of 4,064 fps. The new lot of powder appears to be a bit faster burning, giving me an average of 68 fps more velocity than the old lot. Temperatures during these various test were very close to the same so I can't say that warmer temperatures were part of the reason for the increased velocity.
I have only tried two other powders with these bullets in this rifle and those were Varget and VVN540. Using the same casings, primers, hBN coated 25 gr. V-Max bullets and same seating depth I got an average muzzle velocity of 3,856 fps using 23.8 gr. of N-540 and an average muzzle velocity of 3,818 fps using 23.6 gr. of Varget. My tests over my chronograph testify that both of these powders are quite a bit slower burning than 8208 as listed on the IMR Burn Rate chart. In my limited tests it took from .8 gr. to 1.0 gr. more powder to ramp up to average velocities that are 140 fps to 178 fps slower than the 8208 powder. I never tried to match the 8208 velocities with either N-540 or Varget.
I also use IMR 8208 XBR and 39 gr. Sierra BlitzKing and 40 gr. Hornady V-Max bullets in one of my .204 Ruger rifles. I did a couple of tests using some H4895 with the 40 gr. V-Max bullets and in these limited tests, the IMR 8208 XBR appeared to give me just a tiny bit more velocity than H4895 with similar powder chage weights and all other variable being the same. This was a very limited test with only 10 shots fired with the 8208 and the 40 gr. V-Max bullets.
I am very pleased with the performance I am getting out of IMR 8208 XBR in both the .17 Remington and the .204 Ruger. I use the RCBS ChargeMaster 1500 to throw the initial powder charge and then weigh it on my DI MXX-123 digital scale. It flows nicely and fills the casings up close to the maximum volume I like to use and gives me the velocities I like without having to compress the loads.
you need to do some searching, cause this thread is 12 years old and NOT the powder you are asking about. look for oem 8202/milsurplus 8208
farmerjohn
Gold $$ Contributor
Tag
DogBuster
Silver $$ Contributor
Jeff Porter
Gold $$ Contributor
I use the heck out of it in a .223. I use 0.1-0.2 less than H4895 to get same Velos with 69-80gr loads. Tried it in a .243 with 58 Vmax and got good results. Not as good with 95 gr. Classic Hunter but I didnt really try hard. It seemed a bit fast for the heavier 6mm bullets showing pressure before velocity got where I wanted it but the heavy .224 liked it.
Upgrades & Donations
This Forum's expenses are primarily paid by member contributions. You can upgrade your Forum membership in seconds. Gold and Silver members get unlimited FREE classifieds for one year. Gold members can upload custom avatars.
Click Upgrade Membership Button ABOVE to get Gold or Silver Status.
You can also donate any amount, large or small, with the button below. Include your Forum Name in the PayPal Notes field.
To DONATE by CHECK, or make a recurring donation, CLICK HERE to learn how.
Click Upgrade Membership Button ABOVE to get Gold or Silver Status.
You can also donate any amount, large or small, with the button below. Include your Forum Name in the PayPal Notes field.
To DONATE by CHECK, or make a recurring donation, CLICK HERE to learn how.