How much RL15 for a 55gr FMJBT?

[Jicko]

Alliant's site recommends RL7, but I think RL15 should work.

Anyone got any recipe?

[thmpr]

If you have a chrono, it (Sierra) states the best accuracy, 2900 fps is the verlocity to achieve with an OAL of 2.250".

[thmpr]

Also to start with 24.5 grains.

[Jicko]

http://accurateshooter.net/Downloads/sierra223ar.pdf

But it doesn't give me RL15's number.... they only have RL7's... :-(

[Jicko]

If you have a chrono, it (Sierra) states the best accuracy, 2900 fps is the verlocity to achieve with an OAL of 2.250".

I do have a chrono. But i couldn't find the reference for 24.5gr RL15.

Also... how much powder do you think it will take... to push it out to 3250? heh hee.... M193 spec...

[thmpr]

They sent me an email several months ago.... since I was inquiring about it as well. Have not have a chance to experiment with 55 grains since I am hooked on 68 grains ...Well for now.

[thmpr]

Also, if you read the 69 grains SMK, it takes .4 grains to gain 50 fps. so that means it would achieve about 75-80 fps for the 55 grains with a .4 grain increments.

[Pthfndr]

I use 25gr of RL15 behind the Sierra 80 smk for my 600 yard service rifle load. So start at 24.0gr and work up. You'll probably end up at 26gr.

[Jicko]

I use 25gr of RL15 behind the Sierra 80 smk for my 600 yard service rifle load. So start at 24.0gr and work up. You'll probably end up at 26gr.

hmmm... I am talking about 55gr.... should it be... less powder or more powder than 80gr? (i dunno the correlation....)