elkaholic
Well-Known Member
Max approx 5 grains higher.Retumbo 60 grains
Starting loads:
Retumbo. 58 grains
8133. 61 grs
RL33. 64 grains
**this is a new cartridge so this is a best guess based on my 6.5 Sherman
Max approx 5 grains higher.Retumbo 60 grains
Starting loads:
Retumbo. 58 grains
8133. 61 grs
RL33. 64 grains
A client last week used 65 RL33 behind a 147 to fire form and was right about 2900', so the numbers I gave above should be goodMax approx 5 grains higher.
**this is a new cartridge so this is a best guess based on my 6.5 Sherman
LoadedMax approx 5 grains higher.
**this is a new cartridge so this is a best guess based on my 6.5 Sherman
If I had to guess, I'd say 69 RL33 wont pressure it to max. Im thinking 70-71, but we'll see?Loaded
61.5-66 8133
64.5-69 RL33
Only a # of Retumbo on the shelf, better save that. There is room for more 8133 and RL33 in the case, but they're fairly full.
Will see what happens tomorrow. My 26" bartlein has 105 rounds on it so far. So who knows when it'll start to pressure up. My 6.5 prc bartlein carbon did around 150 or so.
I have N570 too but man it gets exponentially harder on bores smaller you go. My 338 rum has moved 6 thou in 200 rounds, my 300 norma improved has moved 27k in 530 rounds w/ N570. I can't imagine how hard it is on 7mm and 6.5mm.If I had to guess, I'd say 69 RL33 wont pressure it to max. Im thinking 70-71, but we'll see?
I think youll find RL33 to be pretty hard on it too!I have N570 too but man it gets exponentially harder on bores smaller you go. My 338 rum has moved 6 thou in 200 rounds, my 300 norma improved has moved 27k in 530 rounds w/ N570. I can't imagine how hard it is on 7mm and 6.5mm.
Rich, you're going to force me to build a Rifle with a Lone Peak Medium Ti Fuzion yet!! What about a .338 MAX? Now that would be slick on a medium Fuzion Ti.View attachment 162771Here is a pic pf the new 6.5 Sherman Max (R) loaded with a 156 Berger at 3.070" to the lands. 6.5 SST (L)
I am expecting to be able to push the 156 at 3250' out of a 26" barrel with N570.
It will be best built on a medium action like a Defiance xm or on a Seekins, etc., but also works well on a Long action.
Don't get stuck on it not working on a short actions though! With bullets like a 140 AB, etc, it would run in the low to mid 2.9 coal range at a velocity between 3350-3400'.
Sure would. The 250 Berger will run up to 300Rich, you're going to force me to build a Rifle with a Lone Peak Medium Ti Fuzion yet!! What about a .338 MAX? Now that would be slick on a medium Fuzion Ti.
Personally. I would use a faster powder for forming, but if you use 570, I would jump it up to about 65 grains. Even though N570 should be a great powder in the max with longer barrels, it may NOT be for a 20"?What is a good fire forming load with n570 and 147s? I ran 59-61grs last night on my 20in. 61gr showed 2669 fps with no pressure. Never used N570. Using 6.5 adg brass and cci250 primers.