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Post by mluning on Jan 27, 2014 20:31:19 GMT -8
How does the cartridge perform with the longer 105-108s, specifically the 105 hybrids?
Was the reamer designed around a certain bullet / brass combo?
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Post by Deleted on Jan 27, 2014 22:11:56 GMT -8
How does the cartridge perform with the longer 105-108s, specifically the 105 hybrids? Was the reamer designed around a certain bullet / brass combo? The reamer was designed with a VLD lead. That being said we are waiting for the 1 in 8 twist barrels. The tooling is just in and waiting for some barrels to test. I have shot Hornady 105's in a 1 in 9 twist as well as the 95 grain Berger VLD with good accuracy.
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Post by redsc on Oct 5, 2014 18:04:38 GMT -8
What velocity should I expect with 105 hybrids in a 20" barrel? What about an 18" barrel?
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Post by Deleted on Oct 5, 2014 19:36:57 GMT -8
What velocity should I expect with 105 hybrids in a 20" barrel? What about an 18" barrel? With a 20" barrel you should be in the 2600 FPS range. It will be about 50 FPS slower for the 18" barrel. If you do the math you will find that the 95 grain Match King will out do the 105's and 107's in every category. It will have more speed, so time of flight is less. It has less wind drift and less drop than the heavier bullets. At 1000 yards the 95 gets there with more energy.
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Post by redsc on Oct 6, 2014 5:44:09 GMT -8
Thanks. How much more velocity are you getting out of the 95's?
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Post by Deleted on Oct 6, 2014 6:05:47 GMT -8
Thanks. How much more velocity are you getting out of the 95's? It will very depending on barrel length. Just for an estimation, use 150 FPS. The longer the barrel the wider the spread, in my experience.
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Post by redsc on Oct 6, 2014 20:33:00 GMT -8
Thank you, this is very helpful.
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Post by caliper on Mar 8, 2016 10:29:55 GMT -8
What sort of OAL can be run with the 95 or 105gr bullets? Can they be seated to mag length, or are they a single-load-only proposition?
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Post by Deleted on Mar 8, 2016 17:05:39 GMT -8
What sort of OAL can be run with the 95 or 105gr bullets? Can they be seated to mag length, or are they a single-load-only proposition? We have been using ASC magazines and load to 2.310. Depending on which bullets you decide on, some can actually reach the rifling at less than mag length.
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Post by ericreschly on Mar 8, 2016 20:55:54 GMT -8
so these barrels are designed to load closer to mag length (shorter throat?) than say the 6mm ar (longer throat?). those seem to need to be loaded longer to reach the lands. and velocity would be a little less as well with the BlackHole. am i understanding this correctly.
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Post by GLSHOOTER on Mar 8, 2016 21:03:26 GMT -8
so these barrels are designed to load closer to mag length (shorter throat?) than say the 6mm ar (longer throat?). those seem to need to be loaded longer to reach the lands. and velocity would be a little less as well with the BlackHole. am i understanding this correctly. Yes on magazine lenght. No on velocity. The polygonal rifling has lower pressure and will be faster across the board inch for inch compared to a conventionally rifled barrel. Greg
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Post by ericreschly on Mar 9, 2016 5:12:37 GMT -8
Ah. Very nice.
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Post by BiggerHammer on Mar 13, 2016 11:59:35 GMT -8
I'm currently shooting a 22" , 8 twist .243 LBC. I only have 40 rounds or so on this barrel. This is the first two, 5 shot groups that I shot at 100 yards, with the Hornady 105gr A-Max. I had 10 in the magazine, fired the group on the right. Made a scope adjustment and fired the second group on the left. It was the first 10 shot string through the barrel. Then I gave the barrel a good cleaning and shot a group with the 95gr Hornady SST's. This group was with the same powder charge as above but a different primer(BR4) and a different case. Neck turned Hornady cases. The first round was out which isn't uncommon for a cold freshly cleaned bore. The rest fell in, I could have done better but it was a chilly day with the wind in th shade and I could tell on all the groups I wasn't "Dead solid" on 20X with the scope I could see the slight tremor. The 95gr SST performed exellent on a Mule deer I shot at 287 yards last season using a 9 twist 6x6.8 SPC
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Post by BiggerHammer on Mar 13, 2016 18:06:01 GMT -8
Took the 105gr A-Max's out to 200 and 300 yards today just to get the real world dope from my 100 yard zero. The 105 A-Max was exactly 3" low at 200 yards from my 100 yard zero. A simple 1 1/2 MOA correction on my turret and it was putting them on the money. I then cranked my turret back to my 100 yard zero and went out to 300 yards. I had a series of dots spread out vertically on the 300 yard target. So I held for my top dot and fired three shots, then drove out to the target to measure the exact drop at 300 from my 100 yards zero. The three shots(Bottom target in the photo) came in at .925 for the group and were exactly 12" low. I drove back to the bench dialed 4 MOA up on my turret held on the top dot again and fired 5 for a group, slight right to left breeze but not enough to really matter. The 5 shot group at 300 yards came in at 1.388.(Top target in the photo) So all in all, I am pleased so for with the 105 A-Max in the 8 twist. Out of curiosity, I dialed my 1 1/2 MOA up dope for my 200 yard zero with the 105gr A-Max and fired 3 shots at 200 yards with the same load but using a 105gr Hornady Match BTHP. Just to see how different the point of impact would be as compared to the A-Max's. The group printed high and left but a respectable .774 for three shots at 200 yards.
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Post by ericreschly on Mar 13, 2016 19:47:28 GMT -8
the more i read about the lbc the more i want one. good shooting.
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