how to reduce velocity extreme spread?

[Bruin]

I am hoping some one can advise me on how to attempt to reduce my extreme spreads in velocity. Right now I am shooting my 300 Win Mag and I am using F215M primers and Ramshot Magnum powder. Thanks, Brian.

[boomtube]

So, what is your current average velocity, E.S. and S.D.?

How far off the lands are you?

How many times has your brass been fired?

Are you FL or neck sizing?

Are you crimping the bullets?

Do you have other loads for that rifle that do better, and, if so, what are they?

[Bruin]

My average velocity for 12 shots fired is 2960 (out of a Broughton 25" 5C land) and the extreme spread was 50. I did not check SD. I am 0.020" off the lands as that seems best for accuracy. This brass has been fired 4 times and I am FL sizing but minimally, still headspacing off of the shoulder. I am not crimping and other loads have similar velocity spreads. Bruin.

[ackleyfan]

Try, RL22
H1000
or Imr 4831!

[Marine sniper]

A lot of it is in brass prep, do you neck turn the brass ? you need to, trim them all to the same length ? do that also, clean and prep primer pockets inside and out, neck size only (only need about .001 neck tension) clean the inside of the neck when you are done with the above, some guys polish the inside of the necks with steel wool, I clean with carb cleaner and toilet paper.

If you go to a little more extreme you can weigh the brass, of course use the same manufacture for all the brass.

[boomtube]

Okay. Sounds like you are doing everything right.

An ES of 50 fps at that speed sounds quite good to me. It's hard to get below that and it really won't make any noticable difference in the field if you do. If the accuracy is good I'd smile and use it!

[goodgrouper]

Originally Posted by Bruin

I am hoping some one can advise me on how to attempt to reduce my extreme spreads in velocity. Right now I am shooting my 300 Win Mag and I am using F215M primers and Ramshot Magnum powder. Thanks, Brian.

The easiest way to change the ES is to change the powder charge!!!!! Go up and down of your current load by .5 grain increments and it will change the ES and SD. Look for the low load node and the upper high node. Graph them out and see if the gun likes that powder. If not, try another powder. It's that easy!