Big Al Posted May 3, 2017 Report Share Posted May 3, 2017 After doing well in the first round of the UKBRA 1000 yard benchrest championship with a customers rifle I decided if I was to continue I should build my own. I collected an 8' length of 3"x2" aluminium on the 7th April after deciding to build myself a heavy gun.. After burning a few gallons of midnight oil for 3 weeks I had a benchrest heavy gun on the 28th April. A load was developed on the 29th. And into competition with it on the 30th. God was kind to me again. I have a 3 week series of almost daily step by steps of the build process on my Facebook page if you follow the link in my signature, sadly there are too many pictures to upload directly here very easily. The action is a Tikka M590 which was modified to operate as a left feed right bolt right eject, the barrel is a Krieger 4 groove 7.5 twist, trigger is a Bix n Andy set at 5oz and the caliber is 6 Dasher with 105 Berger Hybrids. Link to comment Share on other sites More sharing options...
lee w 118 Posted May 3, 2017 Report Share Posted May 3, 2017 Well done Alan,atb LEE Link to comment Share on other sites More sharing options...
lapua Posted May 3, 2017 Report Share Posted May 3, 2017 Intetesting way to mount a scope Link to comment Share on other sites More sharing options...
foxing2night Posted May 4, 2017 Report Share Posted May 4, 2017 The big dog did well Well shot Alan, not the easiest of conditions wind blowing upto 19 mph. That dasher is a awesome calibre Link to comment Share on other sites More sharing options...
brown dog Posted May 4, 2017 Report Share Posted May 4, 2017 Outstanding! Link to comment Share on other sites More sharing options...
Gandy Posted May 4, 2017 Report Share Posted May 4, 2017 How much did the 'heavy gun' weight, it looks shall we say substantial? Link to comment Share on other sites More sharing options...
Big Al Posted May 4, 2017 Author Report Share Posted May 4, 2017 How much did the 'heavy gun' weight, it looks shall we say substantial? The weight as it was shot is 46.5lb which makes it a pussy when shooting free recoil, the 6 Dasher is running the 105 Hybrids at 3100fps and it moves the gun backwards on the bags about an inch. Link to comment Share on other sites More sharing options...
The Gun Pimp Posted May 4, 2017 Report Share Posted May 4, 2017 Wind-wise, it was one of the worst I've seen at Diggle for a 1000 yd BR shoot so many congratulations to Al on his win. Last time, when Al set the new HG record, it was a pretty calm day and we were hoping it was beginner's luck......... Link to comment Share on other sites More sharing options...
Big Al Posted May 4, 2017 Author Report Share Posted May 4, 2017 The big dog did well Well shot Alan, not the easiest of conditions wind blowing upto 19 mph. That dasher is a awesome calibre Thanks Darrel. It will be interesting to get a bit of development time on the load before the next round. Looking at the amount of wind I had on that day the 105s seem to do well and it makes me think that in anything but the harshest winds this little caliber could do well, what it might lack to the 7's in wind drift it might make up for in accuracy? Link to comment Share on other sites More sharing options...
Gandy Posted May 4, 2017 Report Share Posted May 4, 2017 The weight as it was shot is 46.5lb which makes it a pussy when shooting free recoil, the 6 Dasher is running the 105 Hybrids at 3100fps and it moves the gun backwards on the bags about an inch. Brilliant, wouldn't want to have to carry it far though. Link to comment Share on other sites More sharing options...
meles meles Posted May 21, 2017 Report Share Posted May 21, 2017 What grade of alloy did you use? 7050 ? 6082 ? 5083 ? Link to comment Share on other sites More sharing options...
Big Al Posted May 21, 2017 Author Report Share Posted May 21, 2017 What grade of alloy did you use? 7050 ? 6082 ? 5083 ? I used the silver kind, grade was irrelevant on a project like this, I didn't even ask what was. My local stockholder had some 3"x2" in a length that was long enough, thats as technical as it got or needed to be Link to comment Share on other sites More sharing options...
meles meles Posted May 22, 2017 Report Share Posted May 22, 2017 Beggin' pardon, ooman, but the alloy grade might matter. We say might because it depends upon many factors. The 2xxx, 6xxx and 7xxx series alloys gain their strength from precipitation hardening with the 7xxx class generally being the stronger of these alloys. Aircraft are generally made from 2xxx and 7xxx alloys becuase of their strength : weight ratios. Both however, can be a little susceptible to corrosion and the effects of temperature. Temperature effects are probably irrelevant in this instance because the action is a Tikka action and not made from aluminium. We would be very wary of an aluminium action: that would have to be made of the correct grade ! The 5xxx series of alloys are not as strong as the 6xxx or 7xxx series alloys, but that doesn't matter here because it isn't being used for the action. The 5xxx series alloys are generally better resistant to corrosion. Most boats are made of 5xxx. For your design, it probably is fine to make it from any of the grades considered above. However, were someone to be considering making a load / pressure bearing part from aluminium, we'd suggest they think very hard about what grade to use ! Or better still, use an iron alloy. Link to comment Share on other sites More sharing options...
MJR Posted May 22, 2017 Report Share Posted May 22, 2017 Come on Brock, shape up, it's obvious it was made of Big Alloy..... Link to comment Share on other sites More sharing options...
Big Al Posted May 22, 2017 Author Report Share Posted May 22, 2017 Beggin' pardon, ooman, but the alloy grade might matter. We say might because it depends upon many factors. The 2xxx, 6xxx and 7xxx series alloys gain their strength from precipitation hardening with the 7xxx class generally being the stronger of these alloys. Aircraft are generally made from 2xxx and 7xxx alloys becuase of their strength : weight ratios. Both however, can be a little susceptible to corrosion and the effects of temperature. Temperature effects are probably irrelevant in this instance because the action is a Tikka action and not made from aluminium. We would be very wary of an aluminium action: that would have to be made of the correct grade ! The 5xxx series of alloys are not as strong as the 6xxx or 7xxx series alloys, but that doesn't matter here because it isn't being used for the action. The 5xxx series alloys are generally better resistant to corrosion. Most boats are made of 5xxx. For your design, it probably is fine to make it from any of the grades considered above. However, were someone to be considering making a load / pressure bearing part from aluminium, we'd suggest they think very hard about what grade to use ! Or better still, use an iron alloy. In the examples you give for considering material grades and the application I have used it in I feel as if we are back at the beginning which is confirming that the grade doesn't really matter here. I needed a material with the right weight to volume ratio which aluminium gave and it was used in this application to provide weight and relatively easy machining properties with enough rigidity and corrosion resistance for the application, any readily available aluminium grade would be fine for this. There was no consideration needed for its ability to bear pressure or any other significant other types of load bearing or corrosion resistance. Coming from the background in engineering I have then I would agree with you that material specifications are vital in many situations and as such they would be used when needed, this was a lump of ally to shape a heavy gun stock that had to do nothing but allow an action to be bolted to it and machine freely - it is what it is and it works well enough in that regard Link to comment Share on other sites More sharing options...
Big Al Posted May 22, 2017 Author Report Share Posted May 22, 2017 Come on Brock, shape up, it's obvious it was made of Big Alloy..... Link to comment Share on other sites More sharing options...
meles meles Posted May 22, 2017 Report Share Posted May 22, 2017 Come on Brock, shape up, it's obvious it was made of Big Alloy..... Hmmm, that told us, good and proper ! Link to comment Share on other sites More sharing options...
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