Faster
*205 MRP-2
206 S-371
207 WMR
208 N-170
209 Retumbo
210 H-870
211 AR-2214
*212 RL-25
Slower

Ricci, in you burn-rate list above, you have Rl-25 being extremely slow - how did you arrive at this? My experience with Rl-25 is that it's about the same as MRP-2, Retumbo, or Ramshot Mag - maybe a bit faster, but with more energy content. Rl-25 is clearly faster than H870.

In actuality, the following have very similar burning characteristics:

201 N-165 202 IMR-7828 203 H-1000 204 AR-2217 205 MRP-2 206 S-371 207 WMR

And the following have very similar burning characteristics, except they are "one level" slower than the above:

208 N-170 209 Retumbo

And "one level" slower those are:

210 H-870 211 AR-2214 212 RL-25


How did I arrive at these rates?

From personal experience of around 45 years of reloading over 400 different calibers.

Rici, I agree Re25 is GREAT slow-burning powder, but I disagree it's as slow as you say it is - besides all the "official" burn-rate charts have it faster as well.

ADI-AR2214 = what American powder?

quote:

Originally posted by Ackley Improved User:
Rici, I agree Re25 is GREAT slow-burning powder, but I disagree it's as slow as you say it is - besides all the "official" burn-rate charts have it faster as well.

ADI-AR2214 = what American powder?

No exact equivalent. Never sold by Hodgdon; discontinued several years ago and replaced by AR2217 [H1000 equiv], which is about 5% faster than 2214 was.

Published information that I have seen indicates that RL-25 is only marginally slower than RL-22. The greater difference that Ricciardelli reports might be attributable to the rather significant lot-to-lot variations in the Reloder (Norma/Bofors) line of powders.

Like four blind men each describing an elephant quite differently by feeling of but a single part of its anatomy, Ricci may have an extremely slow lot of RL-25 on which he is basing his conclusions. Similarly, my only experience with two slow-burners, WC 860 and WC 872, is with one lot of each of the two powders; of the two lots that I have used, WC 872 is slightly FASTER than WC 860. This may or may not be the case with other lots.

ricciardelli,

How much powder do you think you've burned to learn so much?

quote:

Originally posted by Gerard:
Comments and suggestions for improvements are welcome.

I would scrutinize the position of Magpro on this chart...it is close to R25 in the 375 RUM.

quote:

Magpro on this chart...it is close to R25

I can say for sure my lot(s) is a heck of a lot slower than R19, and significantly slower than H4831SC and VN560 in my 300WSM.