Recent content by Sowers64
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300 Norma Mag
I have been doing the same thing I finally settled on 86.3 Retumbo and about .024 setback. Am shooting sub 2” groups at 500yds. Had good luck w N570 also but was dirty and couldn’t get more at the time so went with Retumbo. Getting almost 3050 out of a 30” barrel an no pressure signs so far. I...- Sowers64
- Post #484
- Forum: Reloading Depot
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300 Norma Mag
I would like to hear of any luck with the 230 ATips. Been playing with Retumbo and N570. Chasing loads from 84 gr to 86.3. Seeing some promise but no ah ha loads so far?- Sowers64
- Post #482
- Forum: Reloading Depot
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School me about 300 Norma Magnum
I have seen a few statements on a 30 and 40 deg improvements on this round. How much do you think that buys you? Does your ballistic data hold true and predictable out to 2300 at least? Will it still shoot factory decent at all? I hadn’t considered the improved version until just recently. I...- Sowers64
- Post #81
- Forum: ELR - Beyond 1000 Yards
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School me about 300 Norma Magnum
That’s about the velocity I hope to get. Are you using Retumbo? Maybe a 9-8.5 is what I should consider. Makes sense that the faster you try to spin the more pressure you build. I have very little experience at that Mile plus range but research says there will be some Benifit of a few more rpms...- Sowers64
- Post #79
- Forum: ELR - Beyond 1000 Yards
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School me about 300 Norma Magnum
If it’s not broke don’t fix it maybe? Had read about gain twist barrels years ago but never gave them much thought. Theory seems sound when your target distances start at 1000yd and end North of 2500 yds give or take. 1:8 seems fast when that is what I have for a 6.5 Cm and a 6.5 Gap 4S. Don’t...- Sowers64
- Post #77
- Forum: ELR - Beyond 1000 Yards
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School me about 300 Norma Magnum
Has anyone used a gain twist? Talked to Bartlien and Sierra about the 230 Matchking. Looking at 8.5 - 8 maybe. 27 - 28 inch barrel- Sowers64
- Post #75
- Forum: ELR - Beyond 1000 Yards
