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Big Al

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About Big Al

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    Northumberland
  1. Custom 6.5x47

    Its sold, my friend bought it, the add should have been taken down.
  2. Forster Coax press with Redding Comp dies

    Does the Redding Micrometer bushing die with the same bush give sub 1 thou runout when used in a normal press?
  3. UKBRA 1000 Yard Benchrest - 25th March

    I sold my Heavy Gun to another competitor after it won the 600yd Championship and Ive not had time to build its replacement. Im not sure how much I will shoot in this years 1000yd yet as Im still waiting for the action to arrive for my new rifle. I might shoot a customers rifle in the next comp. I had three customer rifles shooting last time out, Darrel did a great job of leading them all home with a win in Heavy Gun and first overall, Les Prior took his recently re-homed 'Big Dog' to 2nd Heavy Gun and 2nd overall and Simon Mearns took 1st Light Gun and 4th overall - two overall class wins and three in the top four makes me wonder if I shouldn't just leave them to get on with it and carry the flag for me?
  4. UKBRA 1000 Yard Benchrest - 25th March

    Very well shot Darrel, so close to breaking my UKBRA agg record as well - real shame you didn't
  5. new .223 time

    I would go for custom 1:7 or 1:7:5 Bartlein barrel on a T3 donor and if you want put it in a new T3X Adj Varmint stock, all of which I just happen to have. You could have any barrel length and profile for very little more than a new Super Varmint and my accuracy guarantee is far better than Tikka
  6. Seating Depth Rule of Thumb

    That would be where Im at Laurie. Ive shot a lot of 6mm Berger 105 VLD and 105 Hybrids through my benchrest rifle these last 12 months. Ive done lots of load development at both 100 & 600yds and my experience is that the 105 Hybrid is affected just as much by seating depth changes as the 105 VLD and show no extra tolerance at all. My feeling is that barrel harmonics and bullet timing is where its at although Im no scientist so can't explain that in any way above simple layman terms, it certainly works in my mind much better than any kind of self aligning of the bullet theory. I come to this finding simply from the fact that Ive had loads that have shot very well near the lands, say in the jam to 20 thou off range. Then the accuracy has came back again at a medium distance away from the lands, say in the 40-80thou off range and again I can find a node at what I consider a long jump to the lands of say a 100-160 thou jump. Of course I would prefer the longest OAL when shooting a single feed action but it shows there are times when being limited to magazine length doesn't mean we can't achieve great accuracy. We accept that powder charge variations affect barrel harmonics and where exactly the muzzle is in relation to its travel determines group shape and size so, weak all pretty much agree on that. For me this issue of bullet timing, not OBT as I confused things earlier could be one of how long the bullets journey is from case neck to muzzle in relation to the harmonic waves travelling down the barrel and back to the action is. Once we have established a harmonic sine wave over a fixed barrel length and powder charge then that wont ever change, our next variable then is how we slot that bullets journey down the barrel and time its exit in relation to the fixed sine wave. On that basis it would explain to me why Ive been able to fine multiple sweet spots on seating depth for the same barrel and powder charge. I said this earlier and it repeats what you said in your last post though, its far more important to us as shooters to know seating depth testing is vital to accuracy and a comprehensive load development than to fully understand the science of why the changes matter. Of course I concede that I haven't tested as many bullets as you over the years so my findings on this are over a much smaller sample size and could be turned on its head anytime soon
  7. All T3 actions are the same length, there is no short or long action.
  8. I would say £500 isn't enough money to see any real step forward from where you are currently at so put the money away and try to save more as you can. Your 8-32x Fox scope although not state of the art in terms of glass will be good enough in the context of the rest of your gear and Id be surprised if a stock on its own would give you any great leaps forward. Realistically so long as the Fox scope holds POA a good quality barrel will be your first significant improvement. If you were thinking of spending £1600 as you suggest on a factory Tikka you could make real inroads to the rifle you have with a new match quality Bartlein or Krieger barrel chambered and throated to best suit the caliber you choose (with optimised twist rate for the bullets you plan to shoot) a GRS Berserk stock and a trigger upgrade and still have some money left for some ammo. On the other hand buy the new factory Tikka, Im sure it will also be a significant step forward from where you are, sadly £500 in this game doesn't buy you very big steps at all.
  9. Reloading with Rosie

    Rumour has it Les that Edgar Brothers have booked you for the final episode which is to be screened after the 9pm watershed. Eposide 6 - 'Unloading with Rosie'
  10. 3-12 x 50 OK for 300 yard rabbits?

    12x is doable but it would also depend on the thickness of the reticule and how precisely you want to aim, if centre mass is enough then it will be fine, if your wanting to pick out a headshot you might find it harder. I like high mag so long as I can shoot from a rested position 6-24x has always been a good compromise for me and latterly 8-32x
  11. If the left hand Defiance Deviant action I have been waiting for 13 months ever turns up I will be happy to oblige. It will go well with the Bartlein and Manners T4 Carbon Elite, its out of the factory now so shouldn't be long. I think my customers middle name must be Solomon
  12. Seating Depth Rule of Thumb

    Thats an interesting theory Laurie, do you know of any hard test data that supports it? My feelings are that sometimes I dont need to know the reason why something happens, its far more important to me to just acknowledge that it does and then understand the proccess that allows me to make the change and benefit from the results. Through testing I can see the direct benefit of different powder charges in terms of stable POIs and/or vertical trends at distance and also with seating depth or jump changes (albeit we aren't always jumping) it shows at the target as good, bad or ugly - all of this is useful to me without actually understanding the physics, if anyone really does? I remember watching Brian Litz talking about the benefit of Berger Hybrid ogives and the fact he said they were seating depth insensitive compared to other ogives yet this flew and still flies in direct contradiction to my own findings. Ive shot plenty of Hybrids since and seen far too many times how small seating depth changes affect group shape and size at both long and short range, so much so I now scratch my head at what he said. As for bullet alignment, I agree entirely with the concept of introducing the bullet to the lands as concentrically as possible but for me that has to be done by accurate machining of the chamber in relation to the throat (and muzzle) and to its own concentricity as well as making sure the ammunition is as concentric as possible. From an engineering point of view I struggle to buy into the idea that by jumping a bullet more or less it will somehow more accurately align itself better but Im always open to reading any data thats out there. When I mentioned OBT I should have made it clear I wasn't taking about Chris Longs theory per se but more that as we adjust the seating depth we alter the distance the bullet has to travel along the barrel before it exits, I call this barrel timing. We accept that barrel harmonics need to be timed favourably for bullet exit which powder charge or a tuner allows us to do. I then think that timing the bullet exit point even finer by seating depth is the final stage in the process, again if this is really whats happening is largely irrelevant so long as the results give me small groups at long distances.
  13. Seating Depth Rule of Thumb

    There are lots of things accuracy related that we would all like definitive answers on but as you know they are rare and few people have tested enough to be certain. That said I have yet to find a bullet regardless of ogive type that isn't affected by changes to seating depth. How much and the extent of the effect will depend on the extent of your testing, the level of accuracy your shooting system can hold as well as the distance you are testing over. At 100yds its sometimes hard to see what a 5 thou change can do to group shape and size, take it out to 600 or 1000yds and if your testing platform is sound enough it will show up very clearly. I would say the OBT concept is at least a good enough model to allow a load developer an understanding that seating depth is an independent variable to powder charge and something that should always be tested and optimised. To call a load good without doing a seating depth test is to do half a load development in my opinion.
  14. Seating Depth Rule of Thumb

    You seem fixed on the idea you need to advance forward towards the lands to find better accuracy? If you look for them there will be seating depth accuracy nodes at different ranges of seating depth, if its not good at mag length then start working backwards but be mindful of pressure, if your running close to a case full you might be best to starting a bit lower on the charge weight. Having the bullet seated deep will reduce your effective case capacity but if you find accuracy a little slower than you would want its not the end of the world, just start 1.0-1.5gr lower with your charge weights. Jumping a bullet 0.120" or more isn't the end of the world if its accurate and safe. Try some seating depth tests at mag length then go shorter in 0.040" increments. There will be a stand out length and then fine tune around that area. Dont worry if your jumping 0.160" if your throat allows it and the bullet isn't sat too deep in the case, I once had a load that was jumping 0.160" due to similar circumstances and it shot very well indeed. Ideally you would have the freebore optimised to suit the range of bullets you plan to shoot if you were going the rebarrel route but just because you have a long freebore on the Bergara doesn't mean you can't find the accuracy you are looking for, you just need to know where and how to look for it.
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