Range Report 260 Remington & 123 A-Max range report

BoilerUP

Old Salt
Full Member
Minuteman
Jan 16, 2011
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Floyd Co, IN
<span style="text-decoration: underline">Rifle:</span>
IMG_6964.jpg

Savage 110 Long Action
Criterion 26" .260 Rem 8 twist SS varmint contour barrel
Savage 112 BVSS centerfeed stock, converted to staggerfeed
Nikon Monarch 5-20x44

<span style="text-decoration: underline">Environmentals:</span>
Partly cloudy
Temp 85°F, Dewpoint 53°F, ~32% humidity
675' ASL elevation, density altitude ~2400'
Partially shaded (tree) shooting bench
Rifle shot off bags
100 yards

<span style="text-decoration: underline">Load specifics:</span>
2x Nosler brass, neck sized with Lee Collet Die
WLR primer
Hornady 6.5mm 123gr A-Max
COAL 2.84, 0.010" off lands

Notes: I<span style="font-style: italic"> really</span> need to bed my action/stock and don't have any velocities for these loads...my ProChrono & Miles Gilbert Bedrock kit are supposed to arrive tomorrow but I'm out of town on business so today was my range day. The bench also wasn't the most conducive to great accuracy, especially given my marginal but improving form.

<span style="text-decoration: underline">Varget:</span>
38.5: 3 shots, 0.5" group. Two shots touching, one pulled high/left
39.0: 3 shots, .425" group. Two shots in one hole, one pulled high/right
39.5: 3 shots. 2 shots touching, one called flyer 1.5" high
40.0: 3 shots, 0.64" group, horizontal stringing. Showed pressure with Sticky bolt & brass flow

<span style="text-decoration: underline">H380</span>
42.0
42.5
43.0
43.5

All groups were garbage with sticky bolts, which was disappointing considering 41.5gr H380 with a 120 Nosler BT is my whitetail load and shoots very well out of this barrel, as well as my 22" 9 twist Remmy 700 Mountain LSS. Did not try the 43.5gr load due to sticking bolt @ 43.0gr.

<span style="text-decoration: underline">RL17</span>
44.0: 3 shots, 0.7" group. First two shots touching, third pulled .6 right
44.5: 3 shots, 0.61" group. First two shots touching, third called flyer .6 low/right
45.0: 3 shots, 0.46" group.

<span style="text-decoration: underline">H4831SC</span>
47.0: 3 shots, 1"+ group
47.5: 3 shots, 0.63" group. First two touching, third called flyer left
48.0: 3 shots. First two shots one ragged hole, got excited and pulled the third 1.25" up/right in a called flyer. This load looks to be VERY promising.
48.5: 3 shots, 2" group with vertical stringing
49.0: 3 shots, 0.5" group, ejector marks.
49.5: did not test due to pressure @ 49.0

My next test will further explore 48.0gr H4831SC +/- 0.5gr, RL-17 44.5 +/- 0.5gr, and Varget 39.0 +/- 0.5gr, thankfully with velocity data!
 
Re: 260 Remington & 123 A-Max range report

Had very limited time to load over the last couple weeks, but wanted to test out the new ProChrono today.

Looks like 48.0gr H4831SC pushes the 123gr A-Max to 3000fps from my 26" Criterion barrel using RP .260 brass. This load had an ES of 20 and a SD of 8. This load also exhibited the best accuracy of the 5 loads I tested today with no pressure signs despite being a little compressed; think I'll probably work +/- 0.2gr either side to try and find a sweet spot.

38.5gr Varget provided average velocities of 2867fps with ES of 37 and SD of 18; 39.0gr Varget averaged 2893fps with an ES of 18 and SD of 9.

My next range trip I'll likely explore W760 and RL17 along with fine-tuning the 4831SC load.
 
Had very limited time to load over the last couple weeks, but wanted to test out the new ProChrono today.

Looks like 48.0gr H4831SC pushes the 123gr A-Max to 3000fps from my 26" Criterion barrel using RP .260 brass. This load had an ES of 20 and a SD of 8. This load also exhibited the best accuracy of the 5 loads I tested today with no pressure signs despite being a little compressed; think I'll probably work +/- 0.2gr either side to try and find a sweet spot.


38.5gr Varget provided average velocities of 2867fps with ES of 37 and SD of 18; 39.0gr Varget averaged 2893fps with an ES of 18 and SD of 9.

My next range trip I'll likely explore W760 and RL17 along with fine-tuning the 4831SC load.

Was wondering if you are using magnum primers with 48 grains of H4831SC?
 
Boiler, quit pulling your 3rd shot!!!! Hah! Good results. That third shot has to be consistent though. I struggle at times with the same issue. It's hard reading the tea leaves when there is an error factor. Your results with rl-17 is close to the results I got. 44.5-44.7 is the sweet spot with my 26" CBI.
Couldn't get the velocity I wanted with varget. Good write up.
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