Win75
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Post by Win75 on Aug 19, 2013 2:21:21 GMT -8
I have been trying to get a load worked up for my BHW 6x45 using the 85gr. Nosler Partition. I have used IMR4895, IMR 8208, BLC-2, 322, and 748. I have yet to get anything under 2 inches and mostly 3-4 inch patterns at 100 yds. I am beginning to think my rifle does not like this bullet. Any suggestions?
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Post by GLSHOOTER on Aug 19, 2013 7:51:12 GMT -8
You loading magazine length? There are some bullets that just won't shoot. Which bullets have you had good luck with?
Greg
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Win75
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Post by Win75 on Aug 19, 2013 12:26:02 GMT -8
I have tried 2.350 and then I crunched them down to magazine length. The 2.350 shot worse that the 2.260. Sierra 60gr. HP's shoot into about 3/4 inch at a 100. The 70gr. Sierra's do just about as good. I am going to try a couple more loads with the Partition. Hate to give up but these random patterns are getting expensive plus the bullets are hard to find. I may have to just move on to something else for a possible deer load. I have some 80gr. Winchester PSP bullets, some 70gr. Nosler Ballistic tips, and some 95gr. Partitions.
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Win75
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Post by Win75 on Aug 26, 2013 5:28:10 GMT -8
I found a box of Hornady 85gr. Interbond bullets and I will give them a try tomorrow along with some of the above mentioned bullets. The Interbonds should be great whitetail bullets. Hornady claims 90% weight retention and excellent expansion.
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Deleted
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Post by Deleted on Sept 6, 2013 15:34:53 GMT -8
In my 6x45 I run the 85g partition in front of 24.4g H335 and averages .507" @ 100 yds, 1/10" twist bbl, 2.250" col I run the 80g partition w/25.3 h335, 2.250" col at about 2900 fps, as accurate as the others. Try the sierra 85g GKHP in front of 24.3g H335, 2.250" col, averages .620 @ 100 yds, 2691 fps and will drop antelope out here to 400 yds w/no issues. Ive shot antelope w/all 3 bullets, all dead within 30 yards of 1 shot.
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Win75
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Post by Win75 on Sept 7, 2013 16:44:36 GMT -8
I don't have any H-335 and have not been able to find any around here. If I find some, I will give it a try.
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Win75
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Post by Win75 on Sept 13, 2013 14:23:46 GMT -8
Went to the range again today. This barrel will not shoot 85gr. partitions. Also will not shoot 95gr. partitions. 60gr. Sierra's, 70 gr. Sierra's both shoot great. 1/2 inch to 3/4 inch groups. I loaded some 80gr. Winchester flat base soft point bullets and with three different powders they shot into less than 3/4 inch groups. I loaded some 85gr. Hornady Interbond but dumb me, did not check to make sure they fit into the magazine . Have to reduce the OAL slightly and go back to check those loads.
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dr69er
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Post by dr69er on Sept 26, 2013 16:06:09 GMT -8
The 6mm/.243 caliber especially the 6x45mm round is very sensitive to twist rate especially with the longer and heavier pills above 85 grains, IMHO a 1:8 twist is needed to properly stabilize these pills when also considering the modest velocity numbers with the round & pill combo. JMHO.
Good Luck.
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Post by GLSHOOTER on Sept 26, 2013 16:12:29 GMT -8
The 6mm/.243 caliber especially the 6x45mm round is very sensitive to twist rate especially with the longer and heavier pills above 85 grains, IMHO a 1:8 twist is needed to properly stabilize these pills when also considering the modest velocity numbers with the round & pill combo. JMHO. Good Luck. Respectfully then why do all my 1:10's and 1:9's shoot so well? The recognized standard on competition built 6X45's has been 1:10 since I first started shooting them in the 80's. Our bullet of choice was the 87 grain Hornady. BHW has not done any 1:8 6 MM's and there doesn't seem to be a real issue with their performance yet. I have been shooting Sierra 95's out of my 1:10 with no issue and the 105's with a 1:9. Greg
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dr69er
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Post by dr69er on Sept 26, 2013 17:34:38 GMT -8
The 6mm/.243 caliber especially the 6x45mm round is very sensitive to twist rate especially with the longer and heavier pills above 85 grains, IMHO a 1:8 twist is needed to properly stabilize these pills when also considering the modest velocity numbers with the round & pill combo. JMHO. Good Luck. Respectfully then why do all my 1:10's and 1:9's shoot so well? The recognized standard on competition built 6X45's has been 1:10 since I first started shooting them in the 80's. Our bullet of choice was the 87 grain Hornady. BHW has not done any 1:8 6 MM's and there doesn't seem to be a real issue with their performance yet. I have been shooting Sierra 95's out of my 1:10 with no issue and the 105's with a 1:9. Greg I have a 20" 1:10 twist 6x45 Bbl.(non-BHW) and It won't stabilize most pills above 85 grs., now with that said It does not mean that all 6x45 barrels with not stabilize with a 9 or 10 twist with all pills over 85grs., etc. Just speaking from my experience with the above combo. Many factors have to be considered Including start velocity (which is why the longer Bbl. lengths tend to stabilize better etc.). Testing will begin with a 1:9 twist BHW Bbl. soon, so we expect better stabilization with pills above 85grs. in the BHW Bbl. Perhaps the BHW-P3 bore will do better... I have a good friend who is a competition shooter and he generally concurred with me on the Issue when many of factors concerning the 6x45 round,twist rates, start velocity, range, etc. One other note I would like to add, It seems to me that cut rifling seems to stabilize longer pills better from the limited anecdotal results thus far. Below is a very well known Barrels Manufactures Chart for best twist rates from their testing, again , it does not mean every barrel will fall in this category each barrel is unique. RECOMMENDED TWIST RATES linkThis chart is based on jacketed lead-core bullets. With some monolithic and plastic-tipped bullets the above twists may be too slow. The reason for this is that copper and yellow-metal bullets are less dense than lead-core bullets and so with bullets of an equal weight the monolithic bullets are longer. And length has a lot of influence on twist required. The plastic tips on some bullets also add length without weight.
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Post by GLSHOOTER on Sept 26, 2013 17:44:49 GMT -8
Thanks for the insite. Come back and when you have more real world experience. You are late to the party.
We have a World Class Benchrest shooter here on the Forum. He disagrees.
Greg
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dr69er
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Post by dr69er on Sept 26, 2013 17:53:29 GMT -8
Thanks for the insite. Come back and when you have more real world experience. You are late to the party. We have a World Class Benchrest shooter here on the Forum. He disagrees. Greg OK, so I guess a World Class BR Shooter and Barrel Manufacturer does not count, sorry...
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Deleted
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Post by Deleted on Sept 27, 2013 13:41:10 GMT -8
I used shoot that same bullet. I used H335, BLC2 seemed to not want to go under 1.5" col in my bolt gun COL is 2.290", 1/10" twist. The 85g NP would shoot .700" @ 100 yds in my 24" McGowan barrel. I have since went to the 85g Sierra GKHP though.
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Post by GLSHOOTER on Sept 27, 2013 16:12:36 GMT -8
I used shoot that same bullet. I used H335, BLC2 seemed to not want to go under 1.5" col in my bolt gun COL is 2.290", 1/10" twist. The 85g NP would shoot .700" @ 100 yds in my 24" McGowan barrel. I have since went to the 85g Sierra GKHP though. It is amazing what a powder change will make in loads at times. Even when the velocites are extremely close the variance can be night and day. When I work up a load I usually will shoot three different powders for the same bullet at the same length and when I get the winner in velocity/accuracy trade off I start changing parameters tweaking it. Greg
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Win75
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Post by Win75 on Oct 9, 2013 19:07:14 GMT -8
Well, back to the range yesterday. I know now why the 85gr. Partitions and 95gr. Partitions are shooting all over the place. The 85gr. Hornady Interbond shoot the same way. All of them are shooting 6" to 12" groups and when I inspected the targets I find that all of them are entering the target at an angle...keyholeing. Not completely sideways but not straight through the target. They leave a slightly elongated black skidmark on the paper. 80gr. Winchester flat base soft point, 80gr. Winchester BTSP, and 85gr. Sierra soft point all shot into under an inch. Why are my Premium bullets wobbling down range? ?
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