Loads from Charles Sellitto

A photo of his rifle - Black Mamba - appears below the load table

Start with 6mm Remington loads from a current load manual and work up.


BULLET
CHARGE
POWDER
GROUP
AV. VELOCITY
S. D.
NOTES
55 Nos. BTip, Moly
47.0
VARGET
.506
      
"
47.3 
"
.100
3,940 
26 
Spectacular!
"
48.0
"
.435
  
 
warm
"
48.5
"
1.200
4,082
25
HOT
"
53.0
H 380
.392
4,007
22
  
"
54.0
"
.933
4,086
45
HOT
"
53.0
W 760
.257
      
"
54.0
" 
.245 
4,062 
10
Groundhog load
70 Nos BTip, Moly
49.0
IMR 4350
.636
3,327
10
  
"
51.5
IMR 4831
.330
3,655
34
  
" 
52.0
IMR 4831
.987
3,740
9
Warm
" 
51.0
VV N160
.660
3,632
21
  
" 
52.0
H4831 SC
.708
3,560
26
  
"
53.0
H4831 SC
.664
3,650
16
  
"
51.5
RL-19
.660
3,576
8
Warm
Sierra 80 Blitz, Moly
48.5
IMR 4831
.717
3,327
10
  
"
47.5
IMR 4350
.862
3,405
35
  
"
50.0
RL -19
.645
3,425
11
  
"
48.0
H 414
.670
3,630
41
 
Sierra 75 HP Moly
38.0
IMR 4895
.520
3,091
12
Fireforming
"
39.0
IMR 4064
.507
3,207
9
Fireforming
"
39.0
H 335
.506
3,262
34
Fireforming
"
44.0
H 380
.730
3,271
20
Fireforming

Here are the notes Charles sent along with his load data:

The Black Mamba was built by Bob Randazzo of Patriot Arms (608) 585-3306.  Bob is an excellent gunsmith and a
complete fanatic about precision machining.  He personally builds each and every rifle that leaves his shop and
absolutely guarantees the accuracy.  He is also a heck of a nice guy.

The Mamba is a completely re-machined Remington 40X action, sako extractor, oversize recoil lug, Jewell trigger, Hart #7 Stainless barrel w/ 12" twist & .265 tight neck.  The stock is an H-S Precision Tactical that is titanium bedded.
The Bear tapered bases & Leupold QRW rings secure a Lightforce 12x42x56.

All brass is Norma 7x57 which was full length resized to 6mm Rem, then neck turned to .010" neck wall thickness, using Sinclair tools and finally fireformed.  Final loaded ammo necked out at .263".  All bullets were moly coated
using the NECO process.  Groups are 5 shot at 100 yards.  Many sub 1/2" groups were fired while fireforming with Nosler 55 Btips, but specific data was lost in a computer crash.

This rifle proved to be "slow" when compared to attained velocities of other rifles with data posted here.  However, tight groups and low standard deviation were easy to achieve.  The Mamba showed a distinct preference for Nosler 55 Btips loaded .050" off the rifling,while using a variety of powders.  Winchester 760 really stood out with this bullet.  Varget produced a single but spectacular group. (.100") IMR 4064, while sacrificing a little speed, will likely produce small groups an low standard deviation in this rifle.  All 70 & 80 grain bullets were set .005" of the rifling. This data is preliminary and fine tuning for accuracy has just begun.

Early chronograph data was taken using a PACT Model #1 chronograph.  All current data (Y2K) is being measured
with an Oehler 35P.  Although the Oehler is a little more cumbersome to carry around, it functions flawlessly and is
worth the extra money & effort.

Remember - Many of these loads are maximum in The Black Mamba;  Start with 6mm Rem loads and work up
carefully!  Fortunately, I followed this advise myself and found that this rifle could not use many of the heavy loads
which worked for other shooters.

Charlie

231lb. Black Bear Charles arrowed @ 17 yards.    September 21, 2000

 
 
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