.257 Bee and Retumbo

[DesertBoy]

Looking for a staring load for the 135gr Berger. Any info much appreciated

 

[Phil Rizzo]

Berger will normally email you some good data with many powders.

 

[FEENIX]

Looking for a staring load for the 135gr Berger. Any info much appreciated

 

[DesertBoy]

Thank you sir.

 

[AZShooter]

I think you should go with RL-33.

 

[Phil Rizzo]

Which of the extremely slow powders is the most temp stable?
RL33-570 burn rate

 

[Iron Worker]

Looking for a staring load for the 135gr Berger. Any info much appreciated

What is the rifling twist rate in your 257 Bee?

 

[DesertBoy]

I have a 1:7.5 twist, 27" tube. Gun shoots lights out with everything. I have tried RL33, RL25, and H1000 and ran them all up to max load. All shoot 1/2 MOA or better. The best speed I have is with 73.2gr R33 @ 3230fps. The E.S is horrid, so I am just trying to play with some other powders. The E.S on the H1000 is great, but only getting 3190FPS. I really want to approach the 3300FPS mark if possible and keep the E.S 25FPS or less. Not going to shoot at game much over 1000yds, so I am good with that. I am also going to be trying RL26. I will report back with speeds and E.S

 

[Hoss50]

H1000 is working well with the 128gr Hammer in my Bee. 3340fps pushed pretty hard.

Retumbo should work well too.

 

[glimmer]

H1000 is working well with the 128gr Hammer in my Bee. 3340fps pushed pretty hard.

Retumbo should work well too.

How do you know how fast the projectile is traveling?

 

[Iron Worker]

How do you know how fast the projectile is traveling?

Chronograph

 

[Phil Rizzo]

Stopwatch.

 

[glimmer]

That is absolutely funny. You can't determine velocity like that lol. Your research is scrap. Lmao a stopwatch

 

[Phil Rizzo]

That method is plenty accurate for a troll to use. Be thankful.
What exactly did you expect me to tell someone that wants to shoot a "375 RUM with 180-200gr bullets and no brake for ELR"?