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Post by letaz77 on Sept 2, 2011 0:22:29 GMT -8
There has been many questions regarding which barrel length and what bullet weight can provide the sweet-spot for the 6x45mm. So I figured: let us see which barrel legth is the most common in this caliber among forum bloggers. That info would provide the general public with raw data to assist in their search of that "sweet-spot".
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Post by GLSHOOTER on Sept 2, 2011 9:47:48 GMT -8
There has been many questions regarding which barrel length and what bullet weight can provide the sweet-spot for the 6x45mm. So I figured: let us see which barrel legth is the most common in this caliber among forum bloggers. That info would provide the general public with raw data to assist in their search of that "sweet-spot". I run three. 2 20" (HB configuration) guns and a custom 17" for the wife. I've used them in IPSC 3 GUN matches for well over 20 years and feel it is the best compromise. Given I had a shot at a good BHW that I was going to use for HUNTING I would go with a 22" heavy barrel. No bull barrel needed. Greg
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Post by Deleted on Sept 11, 2011 17:11:18 GMT -8
The sweet spot will depend on what bullet and purpose? for getting max speeds testers have used 24" but at this point it is hard to make use of anything slower than varget for that much case capacity. I would think 100gr is the maximun you want to do. 95 VLDs need 8 twist and the rest is all where the best assortment is 80gr, 87gr and 90gr. Sierra, v-max, etc... If you want speed in a short barrel you need to go with fast powders and light bullets so a 18 inch middy should do 2850 that wiht TSX will make it a great 200-300 yards white tail rifle as they expand really well up to 1800fps. For hunting I would go light and unsofisticated. LC brass and I would try AA1680 or 2015.
This is the data for the long barrels from Hodgdon. I have achieved pretty similar from the 20" barrel. Keep in mind the BHW only has 1:10 rate in stock.
6x45mm 70 gr HDY SP H4895 (24" barrel) Start: 25.5gr.-2809 fps; Max: 27.5gr.-3034 fps
75 gr HDY SP H4895 (24" barrel) Start: 25.0gr.-2704 fps; Max: 27.0gr.-2952 fps
90 gr SPR SP H4895 (24" barrel) Start: 23.5gr.-2509 fps; Max: 25.5gr.-2721 fps
100 gr HDY SP H4895 (24" barrel) Start: 22.0gr.-2414 fps; Max: 24.0gr.-2616 fps
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Post by GLSHOOTER on Sept 11, 2011 18:02:08 GMT -8
That is a nice cross section on the 6X45 data. I have never used H4895. What are you running in your rifles Serge?
I have had great results with 748, AA2015 and AA2230 besides the standard old Hodgdon H335. Not hard to get velocity and reliability in a 6X45.
Greg
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Post by Deleted on Sept 26, 2011 18:31:15 GMT -8
At the moment in the 20 inch neighbor, still reasonable for hunting w/o bumping into twigs all the time, the Varget has been chosen mainly not due to overall performance which is very good but because of its versatility independently of extreme temperature changes. When in other powders you see changes up to 100fps with varget the spreads very rarely will go over 10fps. And when we hunt here in the winter it can be 30 degrees or 20 below. So to go fast you can go with 16, 18 inch uppers and a nice 75gr-65gr Vmax or even less with fast powders. In the middle Varget and the ones around perform well. For the "heavies" 24" and slower powders. I am currently testing the superformance powders to see we can make happen what they actually advertised. I think the polygonal rifling and the 24" is the key. We will see when I get the barrel. I don't want this for forest / brush hunting but to pop coyotes at 600 yards.
Cheers, E.
ps: If you have any questions how a bullet should behave, think like one. LOL!
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Post by 03cobra on Oct 5, 2011 7:21:41 GMT -8
I believe the 18in would be a very good choice for your application.
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