Reloader 15 with 155 SMK HPBT

[quicksilver]

I was hoping someone could help me out with starting to max
charge for Reloader 15 and .308 155 gr. SMK HPBT bullets. I can't
seem to find those numbers on the web on my manuals. Thanks
in advance!

 

[dsv424]

My Sierra manual does not have a load for RL-15 for 155g. The closest thing I could find was in my Hornady book for 155g. BT-FMJ. It lists RL-15 min. of 38.3 to a max. of 47.2g.

 

[MEHavey]

Bolt action or gasgun/M1A?

 

[Slamfire]

Just use IMR 4895

[SIZE="3"]Ruger M77 26” 1:10 barrel

155 Nosler Match 42.5 grs IMR 4895  wtd lot L7926 mfgr 2000 TZZ  Brass CC#34  
	 	OAL 2.750" 			
4 July 2009  T =  86 °F					
						
Ave Vel =	2716					
Std Dev =	33					
ES =	113					
High =	2794					
Low =	2681					
N =	10	[/SIZE]

 

[quicksilver]

bolt gun

 

[quicksilver]

That sounds close enough to me. Thanks very much.

 

[quicksilver]

Thanks SlamFire - I had planned on trying IMR4895, R-15, and Varget with these new
155 grain bullets. My rifle seems to really like 4895 with other HPBT's so maybe that's what I'll end up going with.

 

[MEHavey]

Cartridge : .308 Win.
Bullet : .308, 155, Sierra HPBT MK 2155
Cartridge O.A.L. L6: 2.800 inch or 71.12 mm
Barrel Length : 22.0 inch or 558.8 mm
Powder : Alliant Reloder-15

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.652% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Fill Charge Vel Energy Pmax Pmuz Prop.Burnt
% Grains - fps ft.lbs - psi -- psi - %
91 42.07 2514 2175 40,008 7943 93.6
91 42.36 2531 2205 40,807 8004 93.9
92 42.65 2549 2235 41,622 8064 94.1
93 42.95 2566 2266 42,454 8122 94.4
93 43.24 2583 2296 43,302 8181 94.7
94 43.53 2600 2327 44,168 8238 95.0
94 43.83 2618 2358 45,051 8294 95.2
95 44.12 2635 2389 45,951 8350 95.5
96 44.41 2652 2421 46,871 8404 95.8
96 44.71 2669 2452 47,809 8458 96.0
97 45.00 2687 2484 48,766 8510 96.2
98 45.29 2704 2516 49,743 8562 96.5
98 45.59 2721 2548 50,740 8612 96.7
99 45.88 2738 2580 51,757 8662 96.9 ! Near Maximum !
99 46.17 2755 2613 52,796 8710 97.1 ! Near Maximum !
100 46.5 2772 2646 53,856 8758 97.3 ! Near Maximum !

This is for a 22" barrel.
26" will give you about 100fps more at all velocities.
(You can calculate proportionally for shorter tubes)

 

[quicksilver]

I was just checking and it looks as if the 2155 Sierra is the Palma Bullet.
Is that right? I have the 155 bullets that aren't Palmas. Would this significantly change the load data? Thanks very much for the information.

 

[TonyAngel]

This has helped me out.....

http://www.6mmbr.citymaker.com/f/Sierra308Win.pdf

Apparently, some of their data is more conservative than that published by powder manufacturers, but it's a starting point none the less.

BTW, I've found in my rifle, the 155s like to be pushed harder to get good accuracy. For a milder load and good accuracy, I've had good luck with the 150gr SMK. Of course, our rifles are different and yours might act differently. I had, at first, wondered by they would make two SMKs so close in weight, but apparently there are differences that go deeper than 5gr of weight.