30 BR
- Thread starter madderg
- Start date
GSPV
A failure to plan is a plan for failure.
Let us know how it works. I'd think it would be too slow, however. The first lot was good in 6PPC, but subsequent lots were too slow...like 4895 slow.
The new LT-32 might be a candidate, but I'm still thinking too slow. After all 4895 is on the borderline of being too slow. Hence the neck-tension and jam games we play to mitigate.
The new LT-32 might be a candidate, but I'm still thinking too slow. After all 4895 is on the borderline of being too slow. Hence the neck-tension and jam games we play to mitigate.
superlight93
Silver $$ Contributor
You are going to need a long drop tube and a slow hand but it could work. H322 Extreme at around 36 plus grains shoots good. I don't have a powder chart in front of me to see if it's slower or faster than the IMR powder you mentioned.
It may, but, regarding velocity, on the slow side . . . H-322 (Extreme - ADI) and Benchmark both work well, and are considerably denser than H-4198: with my Jones set to throw 34.7 Gr. of H-4198, it throws a little over 37 Gr. of the former pair. The extra 2.3 Gr. is worth about 100 FPS lower velocity - again, however, both H-322(Extreme) and Benchmark will perform (shoot small groups) at competitive levels.
The Hodgdon burn-rate chart lists H-322 at # 74, with IMR 8208XBR at # 85: between the two, in successively slower order, are AA 2015; RL-10; N-130; IMR 3031; N-133; Benchmark; H-335; RS X-Terminator; AA 2230; AA 2460 . . . I have not compared the bulk-density of the 8208 XBR to H-322(Extreme). For comparison, RL-7, IMR 4198, and H-4198 are listed as #s 70, 71, and 72. Between H-4198 and H-322(Extreme), @ #73, lies N-120 . . .
Since you're looking at the same expansion ratio (30BR), these should prove fairly relative - reduce the bore volume, and the burn-rate chart relativity can - and does - "go all to hell!"
If the bulk-density of the 8208 XBR is less than H-322(Extreme), the XBR will, likely, burn like charcoal - that being about what N-133 does. I have found that any powder, listed between H-322(Extreme) and Norma 200, has some usefulness in the 30BR configuration. RG
The Hodgdon burn-rate chart lists H-322 at # 74, with IMR 8208XBR at # 85: between the two, in successively slower order, are AA 2015; RL-10; N-130; IMR 3031; N-133; Benchmark; H-335; RS X-Terminator; AA 2230; AA 2460 . . . I have not compared the bulk-density of the 8208 XBR to H-322(Extreme). For comparison, RL-7, IMR 4198, and H-4198 are listed as #s 70, 71, and 72. Between H-4198 and H-322(Extreme), @ #73, lies N-120 . . .
Since you're looking at the same expansion ratio (30BR), these should prove fairly relative - reduce the bore volume, and the burn-rate chart relativity can - and does - "go all to hell!"
If the bulk-density of the 8208 XBR is less than H-322(Extreme), the XBR will, likely, burn like charcoal - that being about what N-133 does.
I have found that any powder, listed between H-322(Extreme) and Norma 200, has some usefulness in the 30BR configuration. RG
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