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| One of Us |
hadnt done much load development with my 280ackley. had only shot 162gr A-maxs and decided id try some 168gr Matchkings to see if i could get anymore accuracy out of it. did load up a few rounds. VV-N560 loaded 55-58grs, nosler 280AI brass, CCI br primers with the 168gr SMKs. both 55 and 56gr did around 3/4", 57 did .475" and 58 did 1.2" 5 shot groups at 100yards off sandbags. didnt chrony the first 2 loads was happy enough with the half inch group but wasnt really satisfied with the 2735FPS +-3FPS from 57grains, fantastic velocity consistancy however! but dissapointing velocity. 58grains of powder yielded 2830FPS with a similar variation in velocity. better velocity but poor accuracy, didnt go any higher as i thought the accuracy would get worse. my 162gr A-max load is 59gr N560, nosler brass, fed 210 GMM. they cruise at 2900FPS with a larger S.D and they shoot around 3/4MOA to 600yards. where to next for my SMK load? | ||
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| one of us |
Paul, if long range accuracy is what you are wanting I think it would be worth it to try the 58 grain load at longer ranges. As I'm sure you may know, groups could actualy tighten up. | |||
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| One of Us |
paul, just because groups of 58 grs. were larger doesn't mean that they won't tighten back up if you go higher, pressures permitting. i would try 58.5&59grs. and see what happens. velocity is like a new car, always losing value. BC is like diamonds, holding value forever. | |||
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| One of Us |
i was going to give the 150s a try but for some reason i decided id try the 168gr assuming it was a stabilisation problem, wouldnt the groups get better as it went faster? right, ill put in more powder! | |||
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| one of us |
All is not lost. You learned a little about your rifle. All premium components does not guarantee one hole groups. You, your scope and your barrel may be contributing to you disappointment. I have had ordinary Federal round nose factory loads out shoot carefully assembled hand loads due to bullet and throat incompatibility in a 7X57. I have also shot 7MM match bullets in a 7mm Rem Mag that performed no better than ordinary 140 grain soft points. | |||
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one of us |
The A-max is one of the longest bullets out there, if your rifle stabelizes them, it should handle the SMK. I would try 1/2gr increases & see if it tightens up, maybe very OAL. You & the rifle are obviously capable. It could also be the rifle doesn't like SMK above a certain vel. happens. My 338-06 will not shoot any 225gr bullet well much over 2550fps, yet handles 200/210gr & 250gr w/ exc. accuracy. LIFE IS NOT A SPECTATOR'S SPORT! | |||
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| One of Us |
the rifle is a rem700 action that has been trued, with a 26" 1-9 lilja, its only a #5 contour. nightforce 5.5-22X50. mounted in nightforce rings where the bases and rings are all one piece. probably stiffins the action a little too. | |||
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| one of us |
When working up loads, in my 6PPC BR rifle, I often encounter small groups at lower velocities. While these loads may shoot well, on a calm day, they often fail to "buck" the conditions when they arise. As I increase the powder charge, in small increments, the groups normally open up, only to close back up as I approach maximum. This method is loosely related to the often discussed "Ladder Test". | |||
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