.233 with Sierra 60gr TMK and 75gr ELD-M

[Shiftyk5]

So worked up some rounds for the rifle I saved for all last year.

Origin action
Proof prefit
Triggertech special
MDT XRS

I have some N540 I haven’t used so decided to try it out.

60gr TMK N540 Load Test CCI 400


25.8gr- 3108 fps. 9.7 SD

26.0gr- 3153 fps. 14.0 SD

26.2gr- 3130 fps. 11.3 SD

26.4gr- 3279 fps. 13.7 SD

26.6gr- 3307 fps. 13.0 SD



75gr ELD-M N540 Load test CCI 400

25.2gr- 3011 fps. 26.2 SD

25.4gr- 3054 fps. 13.2 SD

25.6gr- 3081 fps. 5.3 SD

25.8gr- 3133 fps. 19.8 SD

26.0gr- 3151 fps. 28.7 SD

So my question is, am I in the ballpark here with velocities ? I have 25 more loaded up at 26.6gr for the 60gr TMK and 25.6 for the eldm. Should I move to a different powder?

I have Varget, H322, ARcomp and a couple pounds of 4895.

 

[supercorndogs]

Seems pretty fast, like you started around max pressure and worked higher, how long is your barrel?

 

[Shiftyk5]

Seems pretty fast, like you started around max pressure and worked higher, how long is your barrel?

Used Vihtavuori’s website for load data. Max for the 75gr eldm is 25.9gr. Used data for swift 62gr scirocco for the 60gr TMK and it’s 26.5gr max. I’m loaded both bullets to .020 off the lands. Yes, started a little higher than I normally would. Trying to conserve supplies.

I have a 26” barrel.
I’m using lake city brass for the 60gr and Winchester 5.56 for the 75gr
Has anyone else used n540?

 

[supercorndogs]

25.8g at 2956 from a 25" barrel is what they show. You aren't getting another 200fps from the same charge weight at the same pressure because you have a 1 inch longer barrel. Your velocity is significantly higher because your pressure is.

CCI 400s have kind of thin cups. I do like to use max loads with them.

 

[Shiftyk5]

25.8g at 2956 from a 25" barrel is what they show. You aren't getting another 200fps from the same charge weight at the same pressure because you have a 1 inch longer barrel. Your velocity is significantly higher because your pressure is.

CCI 400s have kind of thin cups. I do like to use max loads with them.

I’ll pull what I have loaded and drop down some more. I don’t like to use the 400’s either but it’s all that was available when I bought them.

 

[TonyTheTiger]

@Shiftyk5 let's hear more about the RMR 69's. Looks like they're shooting great for a cheap bullet.

 

[Shiftyk5]

@Shiftyk5 let's hear more about the RMR 69's. Looks like they're shooting great for a cheap bullet.

Yeah those shoot surprisingly good. It’s a load I worked up for my 18” Bartlein ar15.
69gr RMR $.14 a bullet
Federal brass x4 fired
CCI 400
25.6gr Varget
2.260” COAL
Running about 2865 out of an 18” barrel.