Lots of duplicates

[RJS34]

I am fairly new to reloading and am working up some loads for my .270 Weatherby Mag with a Rockchucker. I made 6 different 5 round loads (3 with one type of powder and 3 with another). Here are the results.

Nosler 150 gr. ballistic tip.

Reloder 25 (69 gr)
2936
2930
2936
2930
2930
2932 (Average)
3 (ES)
6 (SD)
Good (Grouping)

Reloder 25 (68 gr)
2824
2836
2849
2849
2849
2841 (Average)
11 (ES)
25 (SD)
Poor (Grouping)

Reloder 25 (70 gr)
3003
3009
3009
2996
2969
2997 (Average)
16 (ES)
40 (SD)
Poor (Grouping)

Reloder 22 (72 gr)
3100
3100
3115
3122
3108
3109 (Avg)
9 (ES)
22 (SD)
Good/Excellent (Grouping)

Reloder 22 (70.5 gr)
3051
3037
3051
6051
3030
3044 (Avg)
9 (ES)
21 (SD)
Poor (Grouping)

Reloder 22 (69 gr)
2989
3003
2976
3016
2956
2998 (Avg)
23 (SD)
60 (ES)
Good (Grouping)

I am using a ProChrono Chronograph. I have done loads with .40 SW, 9mm, 22-250 and 30-06 and have got at most 1 duplicate. Tonight I got at least 1 duplicate on 5 of the 6 loads.

It really isn't that big of a deal I just thought it was strange. Do you find you get a lot of duplicates on your loads?