I'm a Winchester M88 fan and have several in 308 and one each of 243, 284, and 358. I just like how they come up to my shoulder and point where I'm looking. To me that is the most important attribute of a brush rifle for close in work. The 358 is tough to beat for a cartridge that can throw a...
I can't begin to estimate the number of rounds that I've sent downrange to find something slightly faster or more accurate. It's going down a rabbit hole and little good will come out of it. Between H4350, Varget, and H4895 you have three reasonable powders for launching 85 gr. bullets out of...
I use 100 gr. NBT and H4350 in my 25-06 and get outstanding accuracy. H4350 will likely give you the highest velocity of the powders listed, but Varget and H4895 will be less than 100 fps slower at MOP.
I have a CZ527 in 6.5 Grendel and a 18" Satern barrel on an AR platform.
Frankly the AR is more accurate than the bolt gun.
What the planned use will determine the choice.
Based on my experience with the 375 Bee, you should get higher velocities with RL-17, but H4350 is a solid performer too. With a 300 AB I can get almost 2700 fps in my rifle with H4350 and another 80 fps or so with RL-17.
46.0 gr. of Lever got the 250 NPAR slightly above 2300 fps at 15' from the muzzle and there might be another 50 fps available.
According to the ballistic tables the velocity of the 338 Federal with 250s differs from the 338 WM by ~ 200 yards. A 338 WM at 400 yards is about the same as a 338...
Mine wears a 24" barrel. With the high expansion ratio of the cartridge to bore volume, I don't that you will see a significant impact going from a 24" to a 22" barrel.
I totally understand your powder situation, but in some ways it's worse to be short projectiles.
In my rifles I have found that IMR 4451, RL-23, and IMR 7828 all perform well from both the accuracy and velocity perspective with 90-100 grain bullets. 7828 really surprised me with 100 grain...
I have a collection of M88s myself, and had one of the 308 rifles picked out to have JES rebore it to 358. Then magic happened as I was able to purchase a nice pre-64 358 at well below market price. The 308 rifle went into storage and I didn't think much of it until the 338 Federal was announced...
One has recently come into my possession and has made a couple range trips. No earth shattering results as yet, but the 210 NPAR is looking promising. It looks like Leverevolution is going to generate the highest velocities and Varget is in the lead for accuracy.
In the old days a big bore...
If you are truly looking for a long range rifle, visit a benchrest match and see who is building the winning rifles. That's what I did and the outcome was well worth the effort.
http://castboolits.gunloads.com/showthr ... ase-powder
7383 "triple base" story origin
I'll tell you exactly how the "triple base" story got started. Back in the late 1990s-early 2000s my friend Linstrum told me in private E-mails of the great results he was getting with basically full case...