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Post by thehartofthings on Jul 29, 2019 14:59:17 GMT -8
Welp I received my barrel, got her together, 24” bull barrel, target crown, adjustable gas block , with a rifle length free float tube. Rifle functions fine, initial loading was at 30.9 of mr2000, it’s about what I shoot in a 20” version but this load produced 3250-3260 fps with a Hornady .75grn bthp, it’s a 1/7 twist as I plan to shoot heavyweights but in the meanwhile I tried a few loads
Mr2000 @ 30.9 MAX , 3250fps avg and the bullet imploded in flight.
75grn bthp match Hornady
Mr2000 @ 28.9 2900, no problems , groups on target
Mr2000 @ 30.9
55grn fmjbt @ 32000fps , Group’s on target
Mr2000 @ 28.9 grains
40 grn ballistic tip @ 2900~fps, groups on target
I understand some bullets may disintegrate from too fast a rpm but I’d like to compile some data , if not load data, then velocity data such as my 75 grn bthp Hornady. I’ve alread shot it at or slightly over 3000 FPS with a tad slower rpm but does anyone have a actual experience data or are we looking to the bullet manufacturers
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Post by GLSHOOTER on Jul 29, 2019 15:48:11 GMT -8
Welp I received my barrel, got her together, 24” bull barrel, target crown, adjustable gas block , with a rifle length free float tube. Rifle functions fine, initial loading was at 30.9 of mr2000, it’s about what I shoot in a 20” version but this load produced 3250-3260 fps with a Hornady .75grn bthp, it’s a 1/7 twist as I plan to shoot heavyweights but in the meanwhile I tried a few loads Mr2000 @ 30.9 MAX , 3250fps avg and the bullet imploded in flight. 75grn bthp match Hornady Mr2000 @ 28.9 2900, no problems , groups on target Mr2000 @ 30.9 55grn fmjbt @ 32000fps , Group’s on target Mr2000 @ 28.9 grains 40 grn ballistic tip @ 2900~fps, groups on target I understand some bullets may disintegrate from too fast a rpm but I’d like to compile some data , if not load data, then velocity data such as my 75 grn bthp Hornady. I’ve alread shot it at or slightly over 3000 FPS with a tad slower rpm but does anyone have a actual experience data or are we looking to the bullet manufacturers The bullets you choose make all the difference because of the jacket thickness. An FMJ 55 is home free no matter how fast you push them. In a 1:8 I blow up 50 VMAX at 3750. The same weight bullet made by Sierra/Nosler have no issues. You will probably not blow up the 77's from S or N. You MIGHT run that Hornady up to 3150 and be OK. I've run 55 Sieras GK'sat 37722 with no issues in my 1:8. On 40 grain Noslers I have exceeded 4,000 and never lost a bullet. I didn't even consider shooting a VMAX at that speed....LOL I shoot a wildcat based on the HAGAR that is bigger than the LBC. My barrel is a 1:8 and looking at my 22 Nosler stuff I have also shot (ALL 24") I've pushed the 77 Nosler CC to 3180 with no issues and had some left with based on pressures. I believe once you get above the 77's you might be hard pressed to blow them up on any brand but across the board i'm finding the Sierras to be out-shooting my Hornady pills at this time. Be a bit cautious as the VAX pressure on the LBC is a bit lower than on the 6.8/HAGAR versions I'm playimg with and I do like to have long brass life.. Good luck on your project. Greg PS: Stay away from the 53 Varmageddons. They may die an early death on the way to the target at 3750. I knw about that!! LOL |
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Post by thehartofthings on Aug 3, 2019 11:52:15 GMT -8
Welp just to report, I finally loaded a full session of the 55grn fmjbt, about 45 of them and they turned out at 3209 FPS with around 32 grains of MR2000, consistent 3 round groups went into as less as an inch and as much as a 3 inches at 600 yards. I’m impressed with it, tho I believe the 1/7 24” heats up pretty quick, probably a 3 or 5 shot string over several minutes is best. I’m sure it’s got more horsepower but Ive just about got all you can get out of the current brass lot.
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